Claude Opus 4.1 vs GPT-5.1 Codex Max
Compare Claude Opus 4.1 by Anthropic against GPT-5.1 Codex Max by OpenAI, tested across 52 shared challenges. Updated June 2026.
Which is better, Claude Opus 4.1 or GPT-5.1 Codex Max?
Claude Opus 4.1 and GPT-5.1 Codex Max are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.1 and GPT-5.1 Codex Max
Claude Opus 4.1 is made by anthropic while GPT-5.1 Codex Max is from openai.
API pricing
Per 1M tokens
Claude Opus 4.1
Input
$15.00
Output
$75.00
GPT-5.1 Codex Max
Input
—
Output
—
Our Verdict
Claude Opus 4.1
GPT-5.1 Codex Max
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
Writing DNA
Style Comparison
Similarity
36%
Claude Opus 4.1 uses 38.4x more emoji
Claude Opus 4.1
GPT-5.1 Codex Max
61%Vocabulary60%
87wSentence Length16w
0.54Hedging0.36
5.1Bold2.3
6.7Lists4.2
0.38Emoji0.00
1.68Headings0.12
0.13Transitions0.03
Based on 17 + 13 text responses
FAQ
