OpenAI o3 vs Mistral Nemo

Compare OpenAI o3 by OpenAI against Mistral Nemo by Mistral AI, tested across 18 shared challenges. Updated April 2026.

Which is better, OpenAI o3 or Mistral Nemo?

OpenAI o3 and Mistral Nemo are both competitive models. OpenAI o3 costs $10/M input tokens vs $0.03/M for Mistral Nemo. Compare their real outputs side by side below.

Key Differences Between OpenAI o3 and Mistral Nemo

OpenAI o3 is made by openai while Mistral Nemo is from mistral. On pricing, OpenAI o3 costs $10/M input tokens vs $0.03/M for Mistral Nemo.

Our Verdict
OpenAI o3
OpenAI o3
Mistral Nemo
Mistral NemoRunner-up

No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier, newer, major provider backing.

Mistral Nemo is 571x cheaper per token — worth considering if cost matters.

Slight edge
Writing DNA

Style Comparison

Similarity
98%

OpenAI o3 uses 37.9x more headings

OpenAI o3
Mistral Nemo
68%Vocabulary46%
14wSentence Length19w
0.26Hedging1.08
0.7Bold3.6
3.0Lists8.0
0.00Emoji0.00
0.38Headings0.00
0.12Transitions0.17
Based on 16 + 10 text responses
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