Gemini 3.7 Flash vs Grok 4.3 — Price, Context, and Capability Compared
Gemini 3.7 Flash vs Grok 4.3: which should I use?
Gemini 3.7 Flash and Grok 4.3 are priced within a few percent of each other. Gemini 3.7 Flash has the larger context window (1,048,576 tokens). Default to Gemini 3.7 Flash unless you specifically need Grok 4.3's edge.
Price, speed, and task evidence
Task verdict
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Gemini 3.7 Flash | Grok 4.3 |
|---|---|---|
| Best fit | Production coding and agentic workflows that need strong capability, low latency, and long context. | General-purpose work where speed and a huge context window both matter. |
| Reasoning mode | Available | Available |
Effective workload cost
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 3.7 Flash | Grok 4.3 |
|---|---|---|
| Coding Agent / task | $0.02 (modeled) (winner) | $0.03 (modeled) |
| Input / output rate | $0.75 / $3.75 per M | $1.25 / $2.50 per M |
Speed
Only non-estimated benchmark results are shown as measured.
| Fact | Gemini 3.7 Flash | Grok 4.3 |
|---|---|---|
| Measured throughput | Unavailable | 98 tokens/s |
| Time to first token | Unavailable | 320 ms |
API compatibility
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Gemini 3.7 Flash | Grok 4.3 |
|---|---|---|
| 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) |
Privacy and retention
Provider policy and residency facts from the verified provider registry. A missing retention policy is not treated as a guarantee.
| Fact | Gemini 3.7 Flash | Grok 4.3 |
|---|---|---|
| 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 |
Migration effort
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | Gemini 3.7 Flash | Grok 4.3 |
|---|---|---|
| Move Gemini 3.7 Flash → Grok 4.3 | config; 2 breaking parameter differences | Target: Grok 4.3 |
| Move Grok 4.3 → Gemini 3.7 Flash | Source: Grok 4.3 | 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. |
Spec comparison
| Gemini 3.7 Flash | Grok 4.3 | |
|---|---|---|
| Price (input) | $0.75/M ✓ | $1.25/M |
| Price (output) | $3.75/M | $2.50/M ✓ |
| Blended price | $1.50/M ✓ | $1.56/M |
| Context window | 1,048,576 tokens ✓ | 1,000,000 tokens |
| Max output | 65,536 tokens ✓ | 64,000 tokens |
| Modalities | text, vision, audio | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-08 | 2026-06 |
| Speed | Not measured | 98 t/s |
Cost at scale (3:1 blended)
| Tokens / month | Gemini 3.7 Flash | Grok 4.3 | Delta |
|---|---|---|---|
| 1,000,000 | $1.50 | $1.56 | $0.06 (1.0×) |
| 10,000,000 | $15.00 | $15.63 | $0.63 (1.0×) |
| 100,000,000 | $150.00 | $156.25 | $6.25 (1.0×) |
Choose Gemini 3.7 Flash if…
- ✓Google’s most intelligent Flash workhorse
- ✓Tunable thinking for coding and agents
- ✓1M-token context with built-in tools
- ✓Production coding and agentic workflows that need strong capability, low latency, and long context.
Choose Grok 4.3 if…
- ✓xAI’s general-purpose flagship
- ✓Extremely fast for its size
- ✓1M-token context
- ✓General-purpose work where speed and a huge context window both matter.
Run this exact matchup right now
Send the same prompt to Gemini 3.7 Flash and Grok 4.3 side by side and see the outputs yourself.
Try Gemini 3.7 Flash vs Grok 4.3 FreeFAQ
Is Gemini 3.7 Flash cheaper than Grok 4.3?
Gemini 3.7 Flash is cheaper, at $1.50 per million blended tokens vs $1.56 for Grok 4.3.
Which has the bigger context window, Gemini 3.7 Flash or Grok 4.3?
Gemini 3.7 Flash has the larger context window: 1,048,576 tokens vs 1,000,000.
Can Gemini 3.7 Flash replace Grok 4.3 for coding?
Both are viable for coding. Google’s most intelligent Flash workhorse (Gemini 3.7 Flash) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.
Neither of these? See Gemini 3.7 Flash alternatives or Grok 4.3 alternatives.
Related
Pricing verified 2026-05-19. Specs verified 2026-08-14.