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GPT-5.1-Codex-Mini vs Claude Sonnet 4

Compare GPT-5.1-Codex-Mini by OpenAI against Claude Sonnet 4 by Anthropic, in 1 community votes, gpt-5.1-codex-mini wins 100% of head-to-head duels, context windows of 400K vs 200K, tested across 34 shared challenges. Updated April 2026.

Which is better, GPT-5.1-Codex-Mini or Claude Sonnet 4?

GPT-5.1-Codex-Mini is the better choice overall, winning 100% of 1 blind community votes on Rival. GPT-5.1-Codex-Mini costs $1.5/M input tokens vs $3/M for Claude Sonnet 4. Context windows: 400K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-5.1-Codex-Mini and Claude Sonnet 4

GPT-5.1-Codex-Mini is made by openai while Claude Sonnet 4 is from anthropic. GPT-5.1-Codex-Mini has a 400K token context window compared to Claude Sonnet 4's 200K. On pricing, GPT-5.1-Codex-Mini costs $1.5/M input tokens vs $3/M for Claude Sonnet 4. In community voting, In 1 community votes, GPT-5.1-Codex-Mini wins 100% of head-to-head duels.

In 1 community votes, GPT-5.1-Codex-Mini wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.

Our Verdict
GPT-5.1-Codex-Mini
GPT-5.1-Codex-MiniWinner
Claude Sonnet 4
Claude Sonnet 4Runner-up

Pick GPT-5.1-Codex-Mini. In 1 blind votes, GPT-5.1-Codex-Mini wins 100% of the time. That's not luck.

Clear winner
Writing DNA

Style Comparison

Similarity
98%

Claude Sonnet 4 uses 87.9x more emoji

GPT-5.1-Codex-Mini
Claude Sonnet 4
65%Vocabulary62%
20wSentence Length111w
0.56Hedging0.40
3.3Bold5.0
3.4Lists9.3
0.00Emoji0.88
0.08Headings2.16
0.05Transitions0.33
Based on 13 + 17 text responses
vs

Ask them anything yourself

GPT-5.1-Codex-MiniClaude Sonnet 4

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%
Read the full reportor download the 14-slide PDF

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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