Claude Opus 5.5 vs Mistral Large 4: pricing compared
For a 30-step coding agent run, Mistral Large 4 is 5.6x cheaper ($0.29 vs $1.66). Prices verified 2026-10-18.
| Claude Opus 5.5 | Mistral Large 4 | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Input / 1M | $4.00 | $0.68 |
| Cached input / 1M | $0.20 | $0.07 |
| Output / 1M | $20.00 | $2.09 |
| Batch discount | 50% | 50% |
| Context window | 1M | 1M |
| Long-context tier | none | none |
Cost on real workloads
| Workload | Claude Opus 5.5 | Mistral Large 4 |
|---|---|---|
| 10,000 chatbot replies 2,000 input + 400 output tokens each, 50% of the prompt cached | $122 | $15.86 |
| One 30-step coding agent run 12K system + tools prompt, 1K output and 3K tool result per step, caching on | $1.66 | $0.29 |
| 1M documents classified (batch) 600 input + 20 output tokens each, batch API where available | $1,400 | $225 |
Price is only half the decision: a cheaper model that needs more steps or retries can cost more per finished task. Run your own numbers in the calculator (both models pinned), or see how both rank in the use-case guides.
FAQ
Is Claude Opus 5.5 cheaper than Mistral Large 4?
For a typical 30-step coding agent run with caching, Mistral Large 4 costs $0.29 and Claude Opus 5.5 costs $1.66, so Mistral Large 4 is 5.6x cheaper. Per 1M tokens, Claude Opus 5.5 is $4.00 / $20.00 and Mistral Large 4 is $0.68 / $2.09.
Which has the bigger context window?
Claude Opus 5.5: 1,000,000 tokens. Mistral Large 4: 1,000,000 tokens.