Claude 2 vs Claude Opus 4
Compare Claude 2 and Claude Opus 4, both from Anthropic, in 2 community votes, claude opus 4 wins 100% of head-to-head duels, context windows of 100K vs 200K, tested across 5 shared challenges. Updated May 2026.
Which is better, Claude 2 or Claude Opus 4?
Claude Opus 4 is the better choice overall, winning 100% of 2 blind community votes on Rival. Claude 2 costs $11.02/M input tokens vs $15/M for Claude Opus 4. Context windows: 100K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between Claude 2 and Claude Opus 4
Claude 2 is made by anthropic while Claude Opus 4 is from anthropic. Claude 2 has a 100K token context window compared to Claude Opus 4's 200K. On pricing, Claude 2 costs $11.02/M input tokens vs $15/M for Claude Opus 4. In community voting, In 2 community votes, Claude Opus 4 wins 100% of head-to-head duels.
In 2 community votes, Claude Opus 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 2 is cheaper on both — 1.4× input, 2.3× output
Pick Claude Opus 4. In 2 blind votes, Claude Opus 4 wins 100% of the time. That's not luck.
Style Comparison
Claude Opus 4 uses 52.1x more hedging
