Claude Opus 4.5 vs GPT-5.1 Codex Max
Compare Claude Opus 4.5 by Anthropic against GPT-5.1 Codex Max by OpenAI, in 9 community votes, claude opus 4.5 wins 71% of head-to-head duels, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude Opus 4.5 or GPT-5.1 Codex Max?
Claude Opus 4.5 is the better choice overall, winning 71% of 9 blind community votes on Rival. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.5 and GPT-5.1 Codex Max
Claude Opus 4.5 is made by anthropic while GPT-5.1 Codex Max is from openai. In community voting, In 9 community votes, Claude Opus 4.5 wins 71% of head-to-head duels.
In 9 community votes, Claude Opus 4.5 wins 71% of head-to-head duels. Claude Opus 4.5 leads in Web Design. Based on blind community voting from the Rival open dataset of 9+ human preference judgments for this pair.
Pick Claude Opus 4.5. In 9 blind votes, Claude Opus 4.5 wins 71% of the time. That's not luck.
Claude Opus 4.5 particularly excels in Web Design.
Style Comparison
Claude Opus 4.5 uses 15.2x more emoji
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
