Mistral Small 4 vs Grok 4.1 Fast
Detailed pricing comparison and cost analysis.
Updated September 2026
Cost Simulator
| Feature | Mistral Small 4 | Grok 4.1 Fast |
|---|---|---|
| Provider | Mistral | xAI |
| Input Price (1M) | $0.15 | $0.20 |
| Output Price (1M) | $0.60 | $0.50 |
| Context Window | 131,000 | 2,000,000 |
Verdict
Mistral Small 4 costs $0.15 per 1M input tokens and $0.60 per 1M output tokens. Grok 4.1 Fast costs $0.20 per 1M input tokens and $0.50 per 1M output tokens. Mistral Small 4 is 25% cheaper on input tokens than Grok 4.1 Fast. For output tokens, Grok 4.1 Fast is the more affordable option at $0.50/1M vs $0.60.
On context window, Grok 4.1 Fast supports 2,000,000 tokens — meaning it can fit more conversation history, documents, or code in a single request. This matters for RAG pipelines, long document analysis, and agentic workflows where context builds up over many turns.
When to choose Mistral Small 4
- ✓ You need the lowest input token cost ($ 0.15/1M)
- ✓ You are already integrated with Mistral
When to choose Grok 4.1 Fast
- ✓ Your workload is output-heavy — Grok 4.1 Fast generates text cheaper
- ✓ You need a larger context window (2,000,000 tokens)
- ✓ You are already integrated with xAI
Use the calculator above to simulate your specific workload and find the exact break-even point. For most applications, the cheapest model is the one that minimises your total monthly bill given your input-to-output token ratio.
Frequently Asked Questions
Is Mistral Small 4 cheaper than Grok 4.1 Fast? ▼
Mistral Small 4 is cheaper on input tokens at $0.15/1M vs $0.20/1M for Grok 4.1 Fast — a 25% saving.
What is the context window of Mistral Small 4 vs Grok 4.1 Fast? ▼
Mistral Small 4 has a 131,000-token context window. Grok 4.1 Fast has a 2,000,000-token context window. Grok 4.1 Fast supports the larger context, suitable for longer documents and agentic workflows.
Which model is better: Mistral Small 4 or Grok 4.1 Fast? ▼
The best choice depends on your use case. For cost efficiency on input tokens, Mistral Small 4 is the cheaper option. For maximum context length, Grok 4.1 Fast supports 2,000,000 tokens. Use the comparison table above to find the right fit for your workload.