Comparison
GPT-5.1 vs Grok 4.6
How GPT-5.1 and Grok 4.6 compare on the numbers that decide the call - and how to switch between them without touching your code.
| Spec | GPT-5.1 | Grok 4.6 |
|---|---|---|
| Input price / 1Mlower is cheaper | $1.25 | $2 |
| Output price / 1Mlower is cheaper | $10 | $6 |
| Context windowbigger fits more | 400K | 500K |
| Typical speedfaster median | 1.4s | 4.3s |
| Quality score | 95/100 | 96/100 |
| Provider | OpenAI | xAI |
Which should you pick?
- GPT-5.1 is cheaper on input tokens ($1.25 vs $2).
- Grok 4.6 takes a larger context window (500K tokens).
- GPT-5.1 is usually the faster to answer.
- Grok 4.6 scores higher on the composite quality benchmark.
You do not have to choose permanently. Name one as your first choice and let Final Router fall back to the other when a provider fails - the request still gets answered, and the log shows which model replied.
Common questions
- Is GPT-5.1 or Grok 4.6 cheaper?
- GPT-5.1 is cheaper on input tokens - $1.25 vs $2 per 1M. Neither is marked up: Final Router bills provider list price.
- Can I switch between GPT-5.1 and Grok 4.6 without changing my code?
- Yes. Both are called through the same OpenAI-compatible endpoint - change only the model id ("openai/gpt-5.1" or "xai/grok-4.6"), or let a routing policy fall back from one to the other automatically.