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Claude 3.7 Sonnet vs GPT-5.1-Codex-Mini

Compare Claude 3.7 Sonnet by Anthropic against GPT-5.1-Codex-Mini by OpenAI, context windows of 200K vs 400K, tested across 54 shared challenges. Updated April 2026.

Which is better, Claude 3.7 Sonnet or GPT-5.1-Codex-Mini?

Claude 3.7 Sonnet and GPT-5.1-Codex-Mini are both competitive models. Claude 3.7 Sonnet costs $3/M input tokens vs $1.5/M for GPT-5.1-Codex-Mini. Context windows: 200K vs 400K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3.7 Sonnet and GPT-5.1-Codex-Mini

Claude 3.7 Sonnet is made by anthropic while GPT-5.1-Codex-Mini is from openai. Claude 3.7 Sonnet has a 200K token context window compared to GPT-5.1-Codex-Mini's 400K. On pricing, Claude 3.7 Sonnet costs $3/M input tokens vs $1.5/M for GPT-5.1-Codex-Mini.

Our Verdict
GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini
Claude 3.7 Sonnet
Claude 3.7 SonnetRunner-up

No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — bigger model tier, newer, bigger context window.

Slight edge
Writing DNA

Style Comparison

Similarity
98%

Claude 3.7 Sonnet uses 23.0x more headings

Claude 3.7 Sonnet
GPT-5.1-Codex-Mini
62%Vocabulary65%
35wSentence Length20w
0.99Hedging0.56
1.2Bold3.3
4.3Lists3.4
0.00Emoji0.00
1.78Headings0.08
0.23Transitions0.05
Based on 13 + 13 text responses
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Claude 3.7 SonnetGPT-5.1-Codex-Mini

279 AI models invented the same fake scientist.

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AI Hallucination Index 2026
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