Claude Opus 5.5 vs Mistral Large 2: Specs & Benchmark Comparison
Claude Opus 5.5 is developed by Anthropic, while Mistral Large 2 comes from Mistral AI. Mistral Large 2 was released in July 2024, and Claude Opus 5.5 followed 26 months later in September 2026. Mistral Large 2 has a published size of about 123 billion parameters; Anthropic has not disclosed the parameter count of Claude Opus 5.5.
We have 31 benchmark results for Claude Opus 5.5 and 5 benchmark results for Mistral Large 2, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
Mistral Large 2 is the cheaper API at $2 per million input tokens and $6 per million output tokens, roughly 2 times cheaper than Claude Opus 5.5 at $4 and $20. Claude Opus 5.5 takes the larger context window at 1M tokens, compared with 128K for Mistral Large 2. Claude Opus 5.5 accepts text and images as input, while Mistral Large 2 accepts text.
| Characteristic | Claude Opus 5.5 | Mistral Large 2 |
|---|---|---|
| Company | Anthropic | Mistral AI |
| Release Date | September 22, 2026 | July 24, 2024 |
| Parameters | — | 123B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 128K |
| Context (output) | 128K | 128K |
| Input Price / 1M | $4.00 | $2.00 |
| Output Price / 1M | $20.00 | $6.00 |
| Average Score | 71.1% | 87.6% |
Verdict
Claude Opus 5.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Opus 5.5 — 0.7, Mistral Large 2 — 0.9.
Mistral Large 2 is 3.0x cheaper: input $2.00/1M vs $4.00/1M tokens.
Claude Opus 5.5 supports a larger context: 1M vs 128K tokens.
Claude Opus 5.5 is newer: released 9/22/2026 vs 7/24/2024.
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Frequently Asked Questions
Which is better for coding — Claude Opus 5.5 or Mistral Large 2?
Which model is cheaper — Claude Opus 5.5 or Mistral Large 2?
Which has a larger context window — Claude Opus 5.5 or Mistral Large 2?
The Claude Opus 5.5 and Mistral Large 2 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Opus 5.5 or Mistral Large 2 page. See also the complete list of AI model comparisons.