GPT-5 Codex vs Mistral Large

Compare GPT-5 Codex by OpenAI against Mistral Large by Mistral AI, tested across 24 shared challenges. Updated April 2026.

Which is better, GPT-5 Codex or Mistral Large?

GPT-5 Codex and Mistral Large are both competitive models. Compare their real outputs side by side below.

Key Differences Between GPT-5 Codex and Mistral Large

GPT-5 Codex is made by openai while Mistral Large is from mistral.

Our Verdict
GPT-5 Codex
GPT-5 Codex
Mistral Large
Mistral LargeRunner-up

No community votes yet. On paper, GPT-5 Codex has the edge — bigger model tier, newer, major provider backing.

Slight edge
Writing DNA

Style Comparison

Similarity
98%

Mistral Large uses 3.9x more bold

GPT-5 Codex
Mistral Large
64%Vocabulary49%
17wSentence Length19w
0.38Hedging0.86
2.3Bold8.9
3.5Lists5.4
0.15Emoji0.31
0.49Headings1.01
0.05Transitions0.10
Based on 13 + 16 text responses
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GPT-5 CodexMistral Large

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
Free preview13 of 58 slides
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