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.
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
API pricing
Cost per 1M tokens
Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
GPT-5.1-Codex
Input
$1.25
2.4× cheaper
Output
$10.00
1.5× cheaper
GPT-5.1-Codex is cheaper on both — 2.4× input, 1.5× output
Writing DNA
Style Comparison
Similarity
64%
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
Research
What we learned reading every model
FAQ
