GPT-5.1 vs Mistral Large 2

Compare GPT-5.1 by OpenAI against Mistral Large 2 by Mistral AI, context windows of 400K vs 128K, tested across 18 shared challenges. Updated April 2026.

Which is better, GPT-5.1 or Mistral Large 2?

GPT-5.1 and Mistral Large 2 are both competitive models. GPT-5.1 costs $1.25/M input tokens vs $8/M for Mistral Large 2. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5.1 and Mistral Large 2

GPT-5.1 is made by openai while Mistral Large 2 is from mistral. GPT-5.1 has a 400K token context window compared to Mistral Large 2's 128K. On pricing, GPT-5.1 costs $1.25/M input tokens vs $8/M for Mistral Large 2.

Our Verdict
GPT-5.1
GPT-5.1
Mistral Large 2
Mistral Large 2Runner-up

No community votes yet. On paper, GPT-5.1 has the edge — bigger model tier, newer, bigger context window, major provider backing.

Slight edge
Writing DNA

Style Comparison

Similarity
100%

Mistral Large 2 uses 79.6x more emoji

GPT-5.1
Mistral Large 2
62%Vocabulary43%
19wSentence Length21w
0.29Hedging0.39
3.5Bold14.4
7.2Lists7.4
0.00Emoji0.80
0.61Headings1.41
0.03Transitions0.01
Based on 14 + 10 text responses
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GPT-5.1Mistral Large 2

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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