Claude 3 Opus vs GPT-5.1-Codex-Mini
Compare Claude 3 Opus by Anthropic against GPT-5.1-Codex-Mini by OpenAI, context windows of 200K vs 400K, tested across 12 shared challenges. Updated May 2026.
Which is better, Claude 3 Opus or GPT-5.1-Codex-Mini?
Claude 3 Opus and GPT-5.1-Codex-Mini are both competitive models. Claude 3 Opus 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 3 Opus and GPT-5.1-Codex-Mini
Claude 3 Opus is made by anthropic while GPT-5.1-Codex-Mini is from openai. Claude 3 Opus has a 200K token context window compared to GPT-5.1-Codex-Mini's 400K. On pricing, Claude 3 Opus costs $15/M input tokens vs $1.5/M for GPT-5.1-Codex-Mini.
Per 1M tokens
GPT-5.1-Codex-Mini is cheaper on both — 10× input, 13× output
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
GPT-5.1-Codex-Mini uses 332.9x more bold
