Mistral Large 3 2512 vs GPT-5.1-Codex: side-by-side summary

Mistral Large 3 2512 and GPT-5.1-Codex are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Mistral Large 3 2512, from Mistral AI, has a 262,144-token context window and is priced at $0.50/M tokens input, $1.50/M tokens output on OpenRouter.

GPT-5.1-Codex, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.

Context window

• Mistral Large 3 2512: 262,144 tokens
• GPT-5.1-Codex: 400,000 tokens

Price

• Mistral Large 3 2512: $0.50/M tokens input, $1.50/M tokens output
• GPT-5.1-Codex: $1.25/M tokens input, $10/M tokens output

Provided by

• Mistral Large 3 2512: Mistral AI
• GPT-5.1-Codex: OpenAI

• Mistral Large 3 2512 model details, providers and pricing
• GPT-5.1-Codex model details, providers and pricing