Claude Opus 4 vs Gemini 2.5 Flash Preview 05-20 (thinking)
Compare Claude Opus 4 by Anthropic against Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI, in 12 community votes, claude opus 4 wins 60% of head-to-head duels, context windows of 200K vs 1.0M, tested across 11 shared challenges. Updated April 2026.
Which is better, Claude Opus 4 or Gemini 2.5 Flash Preview 05-20 (thinking)?
Claude Opus 4 is the better choice overall, winning 60% of 12 blind community votes on Rival. Claude Opus 4 costs $15/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview 05-20 (thinking). 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 05-20 (thinking)
Claude Opus 4 is made by anthropic while Gemini 2.5 Flash Preview 05-20 (thinking) is from google. Claude Opus 4 has a 200K token context window compared to Gemini 2.5 Flash Preview 05-20 (thinking)'s 1049K. On pricing, Claude Opus 4 costs $15/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview 05-20 (thinking). In community voting, In 12 community votes, Claude Opus 4 wins 60% of head-to-head duels.
In 12 community votes, Claude Opus 4 wins 60% of head-to-head duels. Claude Opus 4 leads in Web Design. Based on blind community voting from the Rival open dataset of 12+ human preference judgments for this pair.
Pick Claude Opus 4. In 12 blind votes, Claude Opus 4 wins 60% of the time. That's not luck.
Claude Opus 4 particularly excels in Web Design. Gemini 2.5 Flash Preview 05-20 (thinking) is 21x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Opus 4 uses 52.1x more hedging
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.
