Claude Sonnet 4 vs Gemini 2.5 Flash Preview 05-20 (thinking)
Compare Claude Sonnet 4 by Anthropic against Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI, context windows of 200K vs 1.0M, tested across 12 shared challenges. Updated April 2026.
Which is better, Claude Sonnet 4 or Gemini 2.5 Flash Preview 05-20 (thinking)?
Claude Sonnet 4 and Gemini 2.5 Flash Preview 05-20 (thinking) are both competitive models. Claude Sonnet 4 costs $3/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 Sonnet 4 and Gemini 2.5 Flash Preview 05-20 (thinking)
Claude Sonnet 4 is made by anthropic while Gemini 2.5 Flash Preview 05-20 (thinking) is from google. Claude Sonnet 4 has a 200K token context window compared to Gemini 2.5 Flash Preview 05-20 (thinking)'s 1049K. On pricing, Claude Sonnet 4 costs $3/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview 05-20 (thinking).
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 2.5 Flash Preview 05-20 (thinking) is 4.3x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Sonnet 4 uses 40.1x 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.
