Grok-4.20 Reasoning Alternatives
What is the best alternative to Grok-4.20 Reasoning?
The closest alternative to Grok-4.20 Reasoning (xAI, $3.00/M blended) is Grok 4.3, from xAI, a drop-in migration priced -47.9% relative to Grok-4.20 Reasoning at blended (3:1) rates. There is no meaningful parity loss on this swap.
The closest match to Grok-4.20 Reasoning (xAI, $3.00/M) is Grok 4.3 — a drop-in migration at -47.9% price.
Ranked — top 8 alternatives
| # | Model | Provider | Effort | $/M (Δ%) | tok/s (Δ%) | Context | Parity | Closeness |
|---|---|---|---|---|---|---|---|---|
| 1 | Grok 4.3 | xAI | drop-in | $1.56 (-47.9%) | +88.5% | 0K | 100% | 88 |
| 2 | GLM-5.2 | Z.ai | config | $2.15 (-28.3%) | — | 0K | 80% | 83 |
| 3 | Gemini 3.6 Flash | code-change | $3.38 (+12.5%) | +119.2% | 0K | 100% | 71 | |
| 4 | Grok-4.20 | xAI | drop-in | $3.00 (0%) | +100% | 0K | 60% | 71 |
| 5 | GPT-OSS 120B (Cerebras) | Cerebras | config | $0.45 (-85%) | +4611.5% | -869K | 40% | 71 |
| 6 | Qwen 3.8 30B | Groq | config | $1.20 (-60%) | +1226.9% | -869K | 60% | 70 |
| 7 | Gemini 3.1 Pro | code-change | $4.50 (+50%) | +5.8% | +1M | 100% | 69 | |
| 8 | GLM 4.7 (Cerebras) | Cerebras | config | $2.38 (-20.8%) | +3707.7% | -800K | 40% | 66 |
Top 3, in detail
Same provider — change the model string, nothing else.
base_url: https://api.x.ai/v1 auth: Bearer API key
base_url: https://api.x.ai/v1 auth: Bearer API key sdk: openai model: "grok-4.3"
Keep the `openai` SDK; change `baseURL` and the API key.
You lose: No vision input.
base_url: https://api.x.ai/v1 auth: Bearer API key
base_url: https://api.z.ai/api/paas/v4 auth: Bearer API key sdk: openai model: "glm-5.2"
contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters.
base_url: https://api.x.ai/v1 auth: Bearer API key
base_url: https://generativelanguage.googleapis.com/v1beta auth: API key (header or query param); OAuth/service-account on Vertex AI sdk: @google/genai model: "gemini-3.6-flash"
Or don't migrate at all
One base URL, one key, change the model string — every alternative above is already callable through All AI Ask.
curl https://allaiask.com/api/v1/chat \
-H "Authorization: Bearer $ALLAIASK_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "grok-4.3", "messages": [{"role": "user", "content": "Hello"}]}'Related
FAQ
What is the closest alternative to Grok-4.20 Reasoning?
Grok 4.3 is the closest match: drop-in migration, -47.9% price, no significant parity loss.
Can I switch off Grok-4.20 Reasoning without changing my code?
Within xAI, Grok 4.3 is a drop-in swap — same request shape, just change the model string.
What do I lose switching from Grok-4.20 Reasoning?
Against the closest match, Grok 4.3, we found no significant parity gap on the dimensions we track.
Prices and specs verified 2026-08-08.