Claude 3.7 Sonnet
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Claude 3.7 Sonnet vs GPT-5.1-Codex
Compare Claude 3.7 Sonnet by Anthropic against GPT-5.1-Codex by OpenAI, in 9 community votes, claude 3.7 sonnet wins 57% of head-to-head duels, context windows of 200K vs 400K, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude 3.7 Sonnet or GPT-5.1-Codex?
Claude 3.7 Sonnet is the better choice overall, winning 57% of 9 blind community votes on Rival. Claude 3.7 Sonnet costs $3/M input tokens vs $1.25/M for GPT-5.1-Codex. 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
Claude 3.7 Sonnet is made by anthropic while GPT-5.1-Codex is from openai. Claude 3.7 Sonnet has a 200K token context window compared to GPT-5.1-Codex's 400K. On pricing, Claude 3.7 Sonnet costs $3/M input tokens vs $1.25/M for GPT-5.1-Codex. In community voting, In 9 community votes, Claude 3.7 Sonnet wins 57% of head-to-head duels.
In 9 community votes, Claude 3.7 Sonnet wins 57% of head-to-head duels. Claude 3.7 Sonnet leads in Web Design. Based on blind community voting from the Rival open dataset of 9+ human preference judgments for this pair.
Web Design: Claude 3.7 Sonnet wins 67% of votes
Reasoning: Claude 3.7 Sonnet and GPT-5.1-Codex are tied
Image Generation: Claude 3.7 Sonnet and GPT-5.1-Codex are tied
Our Verdict
Claude 3.7 SonnetWinner
GPT-5.1-CodexRunner-up
Claude 3.7 Sonnet has the edge overall. In 9 blind votes, Claude 3.7 Sonnet wins 57% of the time.
Claude 3.7 Sonnet particularly excels in Web Design.
Slight edge
Writing DNA
Style Comparison
Similarity
94%
Claude 3.7 Sonnet uses 3.5x more headings
Claude 3.7 Sonnet
GPT-5.1-Codex
62%Vocabulary70%
35wSentence Length17w
0.99Hedging0.39
1.2Bold3.4
4.3Lists3.5
0.00Emoji0.00
1.78Headings0.50
0.23Transitions0.38
Based on 13 + 14 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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