Compare Gemini 3.1 Pro and Grok 4.6: Multimodal Intelligence vs 2M Coding Power
Gemini 3.1 Pro vs Grok 4.6: which should I use?
Both Gemini 3.1 Pro and Grok 4.6 support a massive 2M token context window. Gemini 3.1 Pro leads in native audio and video understanding ($2.00/$12.00/M), while Grok 4.6 is built for deep software engineering agents ($3.00/$15.00/M). Verified 2026-09-07.
Verified 2026-09-07
Where can you find price, speed, and task evidence for Gemini 3.1 Pro and Grok 4.6?
Which tasks fit Gemini 3.1 Pro and Grok 4.6?
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Gemini 3.1 Pro | Grok 4.6 |
|---|---|---|
| Best fit | Whole-codebase, whole-document, or long-video analysis in a single request. | Coding agents, tool-use workflows, and complex knowledge work that need frontier capability at a lower cost. |
| Reasoning mode | Available | Available |
What does a Coding Agent workload cost with Gemini 3.1 Pro and Grok 4.6?
Modeled for Coding Agent: 20,000 input + 2,000 output tokens per task, 1 turn. This is a workload model, not a provider quote.
| Fact | Gemini 3.1 Pro | Grok 4.6 |
|---|---|---|
| Coding Agent / task | $0.06 (modeled) | $0.05 (modeled) (winner) |
| Input / output rate | $2.00 / $12.00 per M | $2.00 / $6.00 per M |
How fast are Gemini 3.1 Pro and Grok 4.6?
Only non-estimated benchmark results are shown as measured.
| Fact | Gemini 3.1 Pro | Grok 4.6 |
|---|---|---|
| Measured throughput | 55 tokens/s | Unavailable |
| Time to first token | 420 ms | Unavailable |
How compatible are Gemini 3.1 Pro and Grok 4.6 with APIs?
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Gemini 3.1 Pro | Grok 4.6 |
|---|---|---|
| OpenAI SDK | Not drop-in | Usable |
| Request shape | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. | Full OpenAI chat/completions compatibility — point the openai SDK at api.x.ai and it works unmodified. |
| Streaming | SSE (Gemini streamGenerateContent) | SSE (OpenAI delta) |
What are the privacy and retention policies for Gemini 3.1 Pro and Grok 4.6?
Provider policy and residency facts from the verified provider registry. A missing retention policy is not treated as a guarantee.
| Fact | Gemini 3.1 Pro | Grok 4.6 |
|---|---|---|
| Provider says API data trains models | No | Unavailable |
| Published retention period | Unavailable | Unavailable |
| Data residency | Global by default; Vertex AI offers selectable regional endpoints | Unavailable |
How much effort does it take to migrate between Gemini 3.1 Pro and Grok 4.6?
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | Gemini 3.1 Pro | Grok 4.6 |
|---|---|---|
| Move Gemini 3.1 Pro → Grok 4.6 | config; 2 breaking parameter differences | Target: Grok 4.6 |
| Move Grok 4.6 → Gemini 3.1 Pro | Source: Grok 4.6 | code-change; 1 breaking parameter difference |
| Why | Keep the `openai` SDK; change `baseURL` and the API key. | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. |
Exact-pair operating architecture guide. Verified 2026-09-02. The three sections below are computed from dated scenarios; assumptions and unavailable joins are not observations.
Exact pair boundary: Google / xAI; native media units, usable depth, exact route, cache or batch contract, and rate period must join. Requested models are gemini-3.1-pro and grok-4.6. Provider, rate, pricing, and task pages remain fact owners.
Gemini/Grok media-unit contract compiler
Frozen scenario board. Formula / deterministic rule: admit = native units + preprocessing loss check + context/output/tool reserve + exact contract; unknown units => no supported verdict Boundary: Owns exact-pair media admission, not a broad multimodal winner or arbitrary calculator.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| text | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=text; original artifact/hash; exact host/ID; native unit accounting or preprocessing chain; information-loss check; context/output reserve; tool/schema need; pair admission; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — text is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| image set | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=image set; original artifact/hash; exact host/ID; native unit accounting or preprocessing chain; information-loss check; context/output reserve; tool/schema need; pair admission; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — image set is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| audio | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=audio; original artifact/hash; exact host/ID; native unit accounting or preprocessing chain; information-loss check; context/output reserve; tool/schema need; pair admission; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — audio is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| short video | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=short video; original artifact/hash; exact host/ID; native unit accounting or preprocessing chain; information-loss check; context/output reserve; tool/schema need; pair admission; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — short video is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| PDF with figures | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=PDF with figures; original artifact/hash; exact host/ID; native unit accounting or preprocessing chain; information-loss check; context/output reserve; tool/schema need; pair admission; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — PDF with figures is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unsupported native media | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=unsupported native media; original artifact/hash; exact host/ID; native unit accounting or preprocessing chain; information-loss check; context/output reserve; tool/schema need; pair admission; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — unsupported native media has no matched, dated bilateral observation. | FAIL CLOSED — manual or probe evidence required |
First-party provenance: Google Gemini API model documentation; verification date 2026-09-02. Missing or conflicting joins fail closed.
Usable-context depth receipt
Frozen scenario board. Formula / deterministic rule: usable depth = supported evidence at declared positions after reasoning/output/tool reserve; window size alone never wins Boundary: Owns depth-stratified exact-pair evidence; advertised context and long-document task rankings remain prerequisites or adjacent owners.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| 64K report | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=64K report; tokenizer/estimate owner; evidence positions; prompt/config hashes; reserve; matched recall/support rubric; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — 64K report is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 320K repository | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=320K repository; tokenizer/estimate owner; evidence positions; prompt/config hashes; reserve; matched recall/support rubric; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — 320K repository is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 480K corpus | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=480K corpus; tokenizer/estimate owner; evidence positions; prompt/config hashes; reserve; matched recall/support rubric; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — 480K corpus is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 900K archive | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=900K archive; tokenizer/estimate owner; evidence positions; prompt/config hashes; reserve; matched recall/support rubric; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — 900K archive is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| conflicting-middle evidence | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=conflicting-middle evidence; tokenizer/estimate owner; evidence positions; prompt/config hashes; reserve; matched recall/support rubric; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — conflicting-middle evidence is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unknown token count | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=unknown token count; tokenizer/estimate owner; evidence positions; prompt/config hashes; reserve; matched recall/support rubric; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — unknown token count has no matched, dated bilateral observation. | FAIL CLOSED — manual or probe evidence required |
First-party provenance: Google Gemini API model documentation; verification date 2026-09-02. Missing or conflicting joins fail closed.
Batch-versus-cache operating-mode board
Frozen scenario board. Formula / deterministic rule: mode cost = dated input/output price × accounted tokens × (1 − documented discount); undocumented discount => Unavailable Boundary: Owns exact Gemini/Grok mode selection; discounts cannot cross providers or rate periods.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| synchronous cold | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=synchronous cold; exact route; workload SLA; cache/batch eligibility; acceptance yield; dated rate links; cost/latency result or Unavailable; mode decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — synchronous cold is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| warm-prefix cache | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=warm-prefix cache; exact route; workload SLA; cache/batch eligibility; acceptance yield; dated rate links; cost/latency result or Unavailable; mode decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — warm-prefix cache is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| Gemini batch | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=Gemini batch; exact route; workload SLA; cache/batch eligibility; acceptance yield; dated rate links; cost/latency result or Unavailable; mode decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — Gemini batch is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| Grok cached input | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=Grok cached input; exact route; workload SLA; cache/batch eligibility; acceptance yield; dated rate links; cost/latency result or Unavailable; mode decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — Grok cached input is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| mixed-latency queue | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=mixed-latency queue; exact route; workload SLA; cache/batch eligibility; acceptance yield; dated rate links; cost/latency result or Unavailable; mode decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — mixed-latency queue is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| undocumented discount | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=undocumented discount; exact route; workload SLA; cache/batch eligibility; acceptance yield; dated rate links; cost/latency result or Unavailable; mode decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — undocumented discount is a deterministic fixture pending exact-ID, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: Google Gemini API pricing; verification date 2026-09-02. Missing or conflicting joins fail closed.
Method and limitations: formulas are deterministic; assumptions are labeled; no missing provider, host, account, region, realm, alias, snapshot, version, weight, artifact, effort, tool, modality, workload, rate-period, timestamp, or result is transferred. Run this scenario →
Exact-pair decision guide · verified 2026-09-07
Exact pair boundary: Google / xAI; model endpoint, equal 2M context scale, native audio/video vs software engineering coding powerhouse, and pricing must join. Requested models are gemini-3.1-pro and grok-4.6. Provider, rate, pricing, and task pages remain fact owners.
Token pricing and enterprise workload monthly spend matrix
Frozen scenario board. Formula / deterministic rule: monthly_spend = calls * ((in_tokens * rate_in + out_tokens * rate_out) / 1M) Boundary: Owns base token tariff comparisons and budget expenditure modeling.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| 10K complex reasoning queries | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=10K complex reasoning queries; workload; prompt tokens; completion tokens; Gemini 3.1 Pro spend; Grok 4.6 spend; budget delta; cost winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 10K complex reasoning queries is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 50K automated code generation tasks | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=50K automated code generation tasks; workload; prompt tokens; completion tokens; Gemini 3.1 Pro spend; Grok 4.6 spend; budget delta; cost winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 50K automated code generation tasks is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 100K document analysis calls | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=100K document analysis calls; workload; prompt tokens; completion tokens; Gemini 3.1 Pro spend; Grok 4.6 spend; budget delta; cost winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 100K document analysis calls is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| prompt caching active (Gemini 75% read / Grok 75% read) | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=prompt caching active (Gemini 75% read / Grok 75% read); workload; prompt tokens; completion tokens; Gemini 3.1 Pro spend; Grok 4.6 spend; budget delta; cost winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — prompt caching active (Gemini 75% read / Grok 75% read) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| batch processing active (50% both) | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=batch processing active (50% both); workload; prompt tokens; completion tokens; Gemini 3.1 Pro spend; Grok 4.6 spend; budget delta; cost winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — batch processing active (50% both) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unresolved pricing currency | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=unresolved pricing currency; workload; prompt tokens; completion tokens; Gemini 3.1 Pro spend; Grok 4.6 spend; budget delta; cost winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unresolved pricing currency has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Google Gemini API pricing; verification date 2026-09-07. Missing or conflicting joins fail closed.
Context window (equal 2M) and multimodal admissibility gate
Frozen scenario board. Formula / deterministic rule: admissible = (audio_or_video ? Gemini : Both) && (context <= 2M ? Both : Excluded) Boundary: Owns capability gating for multimodal and long-context workloads.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| text & image prompt (500K context) | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=text & image prompt (500K context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — text & image prompt (500K context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| video stream analysis (1M context) | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=video stream analysis (1M context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — video stream analysis (1M context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| extreme text repository (1.5M context) | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=extreme text repository (1.5M context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — extreme text repository (1.5M context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| multimodal audio call (250K context) | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=multimodal audio call (250K context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — multimodal audio call (250K context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 2M max context boundary test | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=2M max context boundary test; workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 2M max context boundary test is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unsupported media payload format | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=unsupported media payload format; workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unsupported media payload format has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Google Gemini API model documentation; verification date 2026-09-07. Missing or conflicting joins fail closed.
Coding agent iterative tool loop token burn ledger
Frozen scenario board. Formula / deterministic rule: session_cost = sum_loops((cumulative_prompt * rate_in + tool_call_out * rate_out) / 1M) Boundary: Owns multi-step coding agent loop cost modeling.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| 3-step function execution loop | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=3-step function execution loop; agent loop depth; cumulative input tokens; emitted tool tokens; Gemini spend; Grok 4.6 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 3-step function execution loop is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 10-step autonomous bug hunting | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=10-step autonomous bug hunting; agent loop depth; cumulative input tokens; emitted tool tokens; Gemini spend; Grok 4.6 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 10-step autonomous bug hunting is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 25-step full PR generation loop | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=25-step full PR generation loop; agent loop depth; cumulative input tokens; emitted tool tokens; Gemini spend; Grok 4.6 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 25-step full PR generation loop is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 50-step multi-file architectural refactor | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=50-step multi-file architectural refactor; agent loop depth; cumulative input tokens; emitted tool tokens; Gemini spend; Grok 4.6 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 50-step multi-file architectural refactor is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| infinite loop circuit breaker trigger | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=infinite loop circuit breaker trigger; agent loop depth; cumulative input tokens; emitted tool tokens; Gemini spend; Grok 4.6 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — infinite loop circuit breaker trigger is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unhandled tool call syntax error | pair=gemini-3.1-pro vs grok-4.6; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.6; scenario=unhandled tool call syntax error; agent loop depth; cumulative input tokens; emitted tool tokens; Gemini spend; Grok 4.6 spend; cost ratio; agent status; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unhandled tool call syntax error is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: xAI API pricing documentation; verification date 2026-09-07. Missing or conflicting joins fail closed.
Method and limitations: formulas are deterministic; observed and assumed inputs are labeled; no missing provider, host, account, region, realm, alias, snapshot, revision, weight, artifact, control, tool, modality, workload, rate-period, timestamp, or result is transferred. Run this scenario →
How do Gemini 3.1 Pro and Grok 4.6 compare on specs?
| Gemini 3.1 Pro | Grok 4.6 | |
|---|---|---|
| Price (input) | $2.00/M | $2.00/M |
| Price (output) | $12.00/M | $6.00/M ✓ |
| Blended price | $4.50/M | $3.00/M ✓ |
| Context window | 2,000,000 tokens ✓ | 500,000 tokens |
| Max output | 64,000 tokens | 64,000 tokens |
| Modalities | text, vision, audio | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-02 | 2026-08 |
| Speed | 55 t/s | Not measured |
How much do Gemini 3.1 Pro and Grok 4.6 cost at scale?
| Tokens / month | Gemini 3.1 Pro | Grok 4.6 | Delta |
|---|---|---|---|
| 1,000,000 | $4.50 | $3.00 | $1.50 (1.5×) |
| 10,000,000 | $45.00 | $30.00 | $15.00 (1.5×) |
| 100,000,000 | $450.00 | $300.00 | $150.00 (1.5×) |
Choose Gemini 3.1 Pro if…
- ✓Largest context window of any current model (2M tokens)
- ✓Native audio and video understanding
- ✓Google Search grounding
- ✓Whole-codebase, whole-document, or long-video analysis in a single request.
Choose Grok 4.6 if…
- ✓xAI’s newest flagship for coding and agents
- ✓Configurable reasoning for complex tasks
- ✓Frontier-level capability at $2/$6 per million tokens
- ✓Coding agents, tool-use workflows, and complex knowledge work that need frontier capability at a lower cost.
Run this exact matchup right now
Send the same prompt to Gemini 3.1 Pro and Grok 4.6 side by side and see the outputs yourself.
Try Gemini 3.1 Pro vs Grok 4.6 FreeWhat are common questions about Gemini 3.1 Pro and Grok 4.6?
Is Gemini 3.1 Pro cheaper than Grok 4.6?
Grok 4.6 is cheaper, at $3.00 per million blended tokens vs $4.50 for Gemini 3.1 Pro.
Which has the bigger context window, Gemini 3.1 Pro or Grok 4.6?
Gemini 3.1 Pro has the larger context window: 2,000,000 tokens vs 500,000.
Can Gemini 3.1 Pro replace Grok 4.6 for coding?
Both are viable for coding. Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) vs xAI’s newest flagship for coding and agents (Grok 4.6) — pick based on which strength matters more for your workload.
Neither of these? See Gemini 3.1 Pro alternatives or Grok 4.6 alternatives.
What related comparisons help choose between Gemini 3.1 Pro and Grok 4.6?
Gemini 3.1 Pro pricingGrok 4.6 pricingvs Claude Opus 4.8vs Claude Opus 5.5vs Claude Sonnet 5vs DeepSeek V4 ProPremium model tests
Pricing verified 2026-04-06. Specs verified 2026-08-14.