Claude 3 Opus vs GPT-5.1 Codex Max
Compare Claude 3 Opus by Anthropic against GPT-5.1 Codex Max by OpenAI, tested across 12 shared challenges. Updated April 2026.
Which is better, Claude 3 Opus or GPT-5.1 Codex Max?
Claude 3 Opus and GPT-5.1 Codex Max are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude 3 Opus and GPT-5.1 Codex Max
Claude 3 Opus is made by anthropic while GPT-5.1 Codex Max is from openai.
API pricing
Per 1M tokens
Claude 3 Opus
Input
$15.00
Output
$75.00
GPT-5.1 Codex Max
Input
—
Output
—
Our Verdict
Claude 3 Opus
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
75%
GPT-5.1 Codex Max uses 225.1x more bold
Claude 3 Opus
GPT-5.1 Codex Max
54%Vocabulary60%
14wSentence Length16w
0.48Hedging0.36
0.0Bold2.3
3.0Lists4.2
0.00Emoji0.00
0.00Headings0.12
0.06Transitions0.03
Based on 3 + 13 text responses
FAQ
