o3-mini vs Mistral Small 3
Detailed pricing comparison and cost analysis.
Updated September 2026
Cost Simulator
| Feature | o3-mini | Mistral Small 3 |
|---|---|---|
| Provider | OpenAI | Mistral |
| Input Price (1M) | $1.10 | $0.03 |
| Output Price (1M) | $4.40 | $0.11 |
| Context Window | 200,000 | 33,000 |
Verdict
o3-mini costs $1.10 per 1M input tokens and $4.40 per 1M output tokens. Mistral Small 3 costs $0.03 per 1M input tokens and $0.11 per 1M output tokens. Mistral Small 3 is 97% cheaper on input tokens than o3-mini. For output tokens, Mistral Small 3 is the more affordable option at $0.11/1M vs $4.40.
On context window, o3-mini supports 200,000 tokens — meaning it can fit more conversation history, documents, or code in a single request. This matters for RAG pipelines, long document analysis, and agentic workflows where context builds up over many turns.
When to choose o3-mini
- ✓ You need a larger context window (200,000 tokens)
- ✓ You are already integrated with OpenAI
When to choose Mistral Small 3
- ✓ You need the lowest input token cost ($ 0.03/1M)
- ✓ Your workload is output-heavy — Mistral Small 3 generates text cheaper
- ✓ You are already integrated with Mistral
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 o3-mini cheaper than Mistral Small 3? ▼
Mistral Small 3 is cheaper on input tokens at $0.03/1M vs $1.10/1M for o3-mini — a 97% saving.
What is the context window of o3-mini vs Mistral Small 3? ▼
o3-mini has a 200,000-token context window. Mistral Small 3 has a 33,000-token context window. o3-mini supports the larger context, suitable for longer documents and agentic workflows.
Which model is better: o3-mini or Mistral Small 3? ▼
The best choice depends on your use case. For cost efficiency on input tokens, Mistral Small 3 is the cheaper option. For maximum context length, o3-mini supports 200,000 tokens. Use the comparison table above to find the right fit for your workload.