Claude 3.7 Sonnet vs GPT-5.1 Codex Max
Compare Claude 3.7 Sonnet by Anthropic against GPT-5.1 Codex Max by OpenAI, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude 3.7 Sonnet or GPT-5.1 Codex Max?
Claude 3.7 Sonnet and GPT-5.1 Codex Max are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude 3.7 Sonnet and GPT-5.1 Codex Max
Claude 3.7 Sonnet is made by anthropic while GPT-5.1 Codex Max is from openai.
API pricing
Per 1M tokens
Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
GPT-5.1 Codex Max
Input
—
Output
—
Our Verdict
GPT-5.1 Codex Max
Claude 3.7 SonnetRunner-up
No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier, newer.
Too close to call
Writing DNA
Style Comparison
Similarity
56%
Claude 3.7 Sonnet uses 14.4x more headings
Claude 3.7 Sonnet
GPT-5.1 Codex Max
62%Vocabulary60%
35wSentence Length16w
0.99Hedging0.36
1.2Bold2.3
4.3Lists4.2
0.00Emoji0.00
1.78Headings0.12
0.23Transitions0.03
Based on 13 + 13 text responses
FAQ
