GPT-5.1 Codex High vs Mistral Large 2: Specs & Benchmark Comparison
GPT-5.1 Codex High is developed by OpenAI, while Mistral Large 2 comes from Mistral AI. Mistral Large 2 was released in July 2024, and GPT-5.1 Codex High followed 16 months later in November 2025. Mistral Large 2 has a published size of about 123 billion parameters; OpenAI has not disclosed the parameter count of GPT-5.1 Codex High.
We have 1 benchmark result for GPT-5.1 Codex High and 5 benchmark results for Mistral Large 2, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
GPT-5.1 Codex High is the cheaper API at $1.25 per million input tokens and $10 per million output tokens, about 60% below Mistral Large 2 at $2 and $6. GPT-5.1 Codex High takes the larger context window at 400K tokens, compared with 128K for Mistral Large 2. GPT-5.1 Codex High accepts text and images as input, while Mistral Large 2 accepts text.
| Characteristic | GPT-5.1 Codex High | Mistral Large 2 |
|---|---|---|
| Company | OpenAI | Mistral AI |
| Release Date | November 11, 2025 | July 24, 2024 |
| Parameters | — | 123B |
| Multimodal | Yes | No |
| Context (input) | 400K | 128K |
| Context (output) | 128K | 128K |
| Input Price / 1M | $1.25 | $2.00 |
| Output Price / 1M | $10.00 | $6.00 |
| Average Score | 97.0% | 87.6% |
Verdict
GPT-5.1 Codex High leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GPT-5.1 Codex High — 1.0, Mistral Large 2 — 0.9.
Mistral Large 2 is 1.4x cheaper: input $2.00/1M vs $1.25/1M tokens.
GPT-5.1 Codex High supports a larger context: 400K vs 128K tokens.
GPT-5.1 Codex High is newer: released 11/11/2025 vs 7/24/2024.
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Frequently Asked Questions
Which is better for coding — GPT-5.1 Codex High or Mistral Large 2?
Which model is cheaper — GPT-5.1 Codex High or Mistral Large 2?
Which has a larger context window — GPT-5.1 Codex High or Mistral Large 2?
The GPT-5.1 Codex High 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 GPT-5.1 Codex High or Mistral Large 2 page. See also the complete list of AI model comparisons.