Claude Sonnet 4 vs o1
Compare Claude Sonnet 4 by Anthropic against o1 by OpenAI, in 2 community votes, claude sonnet 4 wins 100% of head-to-head duels, context windows of 200K vs 128K, tested across 54 shared challenges. Updated May 2026.
Which is better, Claude Sonnet 4 or o1?
Claude Sonnet 4 is the better choice overall, winning 100% of 2 blind community votes on Rival. Claude Sonnet 4 costs $3/M input tokens vs $15/M for o1. Context windows: 200K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4 and o1
Claude Sonnet 4 is made by anthropic while o1 is from openai. Claude Sonnet 4 has a 200K token context window compared to o1's 128K. On pricing, Claude Sonnet 4 costs $3/M input tokens vs $15/M for o1. In community voting, In 2 community votes, Claude Sonnet 4 wins 100% of head-to-head duels.
In 2 community votes, Claude Sonnet 4 wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.
Per 1M tokens
Claude Sonnet 4 is cheaper on both — 5.0× input, 4.0× output
Pick Claude Sonnet 4. In 2 blind votes, Claude Sonnet 4 wins 100% of the time. That's not luck.
Claude Sonnet 4 is 4.0x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Sonnet 4 uses 87.9x more emoji
