Mistral Devstral Medium vs GPT-5 Pro

Compare Mistral Devstral Medium by Mistral AI against GPT-5 Pro by OpenAI, tested across 42 shared challenges. Updated April 2026.

Which is better, Mistral Devstral Medium or GPT-5 Pro?

Mistral Devstral Medium and GPT-5 Pro are both competitive models. Mistral Devstral Medium costs $0.4/M input tokens vs $15/M for GPT-5 Pro. Compare their real outputs side by side below.

Key Differences Between Mistral Devstral Medium and GPT-5 Pro

Mistral Devstral Medium is made by mistral while GPT-5 Pro is from openai. On pricing, Mistral Devstral Medium costs $0.4/M input tokens vs $15/M for GPT-5 Pro.

Our Verdict
GPT-5 Pro
GPT-5 Pro
Mistral Devstral Medium
Mistral Devstral MediumRunner-up

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

Mistral Devstral Medium is 60x cheaper per token — worth considering if cost matters.

Slight edge
Writing DNA

Style Comparison

Similarity
100%

Mistral Devstral Medium uses 453.5x more bold

Mistral Devstral Medium
GPT-5 Pro
50%Vocabulary65%
17wSentence Length15w
0.56Hedging0.32
4.5Bold0.0
5.3Lists2.9
0.00Emoji0.00
0.19Headings0.00
0.32Transitions0.01
Based on 21 + 11 text responses
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Mistral Devstral MediumGPT-5 Pro

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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FAQ

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