Mistral Nemo vs OpenAI o3

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

Which is better, Mistral Nemo or OpenAI o3?

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

Key Differences Between Mistral Nemo and OpenAI o3

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

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

Mistral Nemo
OpenAI o3
46%Vocabulary68%
19wSentence Length14w
1.08Hedging0.26
3.6Bold0.7
8.0Lists3.0
0.00Emoji0.00
0.00Headings0.38
0.17Transitions0.12
Based on 10 + 16 text responses
vs

Ask them anything yourself

Mistral NemoOpenAI o3

Some models write identically. You are paying for the brand.

178 models fingerprinted across 32 writing dimensions. Free research.

Model Similarity Index

185x

price gap between models that write identically

178

models

12

clone pairs

32

dimensions

Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%

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
FAQ

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