Claude Opus 4.6 vs GPT-5.3-Codex
Compare Claude Opus 4.6 by Anthropic against GPT-5.3-Codex by OpenAI, in 9 community votes, gpt-5.3-codex wins 56% of head-to-head duels, context windows of 1.0M vs 400K, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude Opus 4.6 or GPT-5.3-Codex?
GPT-5.3-Codex is the better choice overall, winning 56% of 9 blind community votes on Rival. Claude Opus 4.6 costs $5/M input tokens vs $1.75/M for GPT-5.3-Codex. Context windows: 1000K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.6 and GPT-5.3-Codex
Claude Opus 4.6 is made by anthropic while GPT-5.3-Codex is from openai. Claude Opus 4.6 has a 1000K token context window compared to GPT-5.3-Codex's 400K. On pricing, Claude Opus 4.6 costs $5/M input tokens vs $1.75/M for GPT-5.3-Codex. In community voting, In 9 community votes, GPT-5.3-Codex wins 56% of head-to-head duels.
In 9 community votes, GPT-5.3-Codex wins 56% of head-to-head duels. Claude Opus 4.6 leads in Reasoning, Image Generation, while GPT-5.3-Codex leads in Web Design. Based on blind community voting from the Rival open dataset of 9+ human preference judgments for this pair.
GPT-5.3-Codex has the edge overall. In 9 blind votes, GPT-5.3-Codex wins 56% of the time.
Pick Claude Opus 4.6 for Image Generation, Reasoning. Pick GPT-5.3-Codex for Web Design.
Style Comparison
GPT-5.3-Codex uses 2.1x more lists
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.
