Claude 3 Opus vs OpenAI Codex Mini
Compare Claude 3 Opus by Anthropic against OpenAI Codex Mini by OpenAI, context windows of 200K vs 200K, tested across 8 shared challenges. Updated June 2026.
Which is better, Claude 3 Opus or OpenAI Codex Mini?
Claude 3 Opus and OpenAI Codex Mini are both competitive models. Claude 3 Opus costs $15/M input tokens vs $1.5/M for OpenAI Codex Mini. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between Claude 3 Opus and OpenAI Codex Mini
Claude 3 Opus is made by anthropic while OpenAI Codex Mini is from openai. Claude 3 Opus has a 200K token context window compared to OpenAI Codex Mini's 200K. On pricing, Claude 3 Opus costs $15/M input tokens vs $1.5/M for OpenAI Codex Mini.
Per 1M tokens
OpenAI Codex Mini is cheaper on both — 10× input, 13× output
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
OpenAI Codex Mini is 13x cheaper per token — worth considering if cost matters.
