Claude Opus 4 vs Gemini 2.5 Flash Preview
Compare Claude Opus 4 by Anthropic against Gemini 2.5 Flash Preview by Google AI, context windows of 200K vs 1.0M, tested across 26 shared challenges. Updated May 2026.
Which is better, Claude Opus 4 or Gemini 2.5 Flash Preview?
Claude Opus 4 and Gemini 2.5 Flash Preview are both competitive models. Claude Opus 4 costs $15/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. Context windows: 200K vs 1049K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and Gemini 2.5 Flash Preview
Claude Opus 4 is made by anthropic while Gemini 2.5 Flash Preview is from google. Claude Opus 4 has a 200K token context window compared to Gemini 2.5 Flash Preview's 1049K. On pricing, Claude Opus 4 costs $15/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview.
Per 1M tokens
Gemini 2.5 Flash Preview is cheaper on both — 100× input, 125× output
No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, newer.
Gemini 2.5 Flash Preview is 125x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Opus 4 uses 11.2x more emoji
