Claude Opus 4 vs GPT-5.1-Codex-Mini
Compare Claude Opus 4 by Anthropic against GPT-5.1-Codex-Mini by OpenAI, context windows of 200K vs 400K, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude Opus 4 or GPT-5.1-Codex-Mini?
Claude Opus 4 and GPT-5.1-Codex-Mini are both competitive models. Claude Opus 4 costs $15/M input tokens vs $1.5/M for GPT-5.1-Codex-Mini. Context windows: 200K vs 400K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and GPT-5.1-Codex-Mini
Claude Opus 4 is made by anthropic while GPT-5.1-Codex-Mini is from openai. Claude Opus 4 has a 200K token context window compared to GPT-5.1-Codex-Mini's 400K. On pricing, Claude Opus 4 costs $15/M input tokens vs $1.5/M for GPT-5.1-Codex-Mini.
No community votes yet. On paper, GPT-5.1-Codex-Mini has the edge — newer, bigger context window.
GPT-5.1-Codex-Mini is 13x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Opus 4 uses 11.2x 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.
