Sim is the open-source AI workspace where teams build, deploy, and manage AI agents. This page compares Claude Opus 5.5 and Mistral Large 4 on API pricing per 1M tokens, context window, max output, and capabilities. Both models are available in the Sim Agent block, and each Agent block in a Sim agent can use a different model.
API model comparison
Claude Opus 5.5 vs Mistral Large 4
Mistral Large 4 is 6.7× cheaper than Claude Opus 5.5: 1,000 agent calls with 10k input and 1k output tokens each cost $8.89 versus $60 at standard rates.
Claude Opus 5.5 charges $4 input and $20 output per 1M tokens; Mistral Large 4 charges $0.68 and $2.09.
Both models have a 1M token context window.
Only Claude Opus 5.5 supports configurable reasoning and native structured outputs in Sim.
Pricing, context window, and capabilities
API prices are per 1M tokens. Pricing last updated .
| Metric | Claude Opus 5.5 | Mistral Large 4 |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Input price | $4/1M | $0.68/1M |
| Cached input | $0.2/1M | $0.07/1M |
| Output price | $20/1M | $2.09/1M |
| Context window | 1M tokens | 1M tokens |
| Released | Sep 22, 2026 | Oct 6, 2026 |
| Temperature | Not configurable | 0 to 1.5 |
| Reasoning effort | Not supported | Not supported |
| Verbosity | Not supported | Not supported |
| Thinking levels | low, medium, high, xhigh, max (default: medium) | Not supported |
| Structured outputs | Supported (native) | Supported |
| Tool choice | Supported | Supported |
| Computer use | Not supported | Not supported |
| Deep research | Not supported | Not supported |
| Memory support | Supported | Supported |
| Max output tokens | 128k | Not published |
Use Claude Opus 5.5 or Mistral Large 4 in a Sim agent
Both models are available in the Sim Agent block. Pick either one from the model picker, and each Agent block in the same agent can use a different model.
Frequently asked questions
Mistral Large 4 is 6.7× cheaper than Claude Opus 5.5: 1,000 agent calls with 10k input and 1k output tokens each cost $8.89 versus $60 at standard rates. Claude Opus 5.5 charges $4 input and $20 output per 1M tokens; Mistral Large 4 charges $0.68 and $2.09.
