Claude Sonnet 4.5 vs Claude Opus 4
Compare Claude Sonnet 4.5 and Claude Opus 4, both from Anthropic, context windows of 200K vs 200K, tested across 42 shared challenges. Updated June 2026.
Which is better, Claude Sonnet 4.5 or Claude Opus 4?
Claude Sonnet 4.5 and Claude Opus 4 are both competitive models. Claude Sonnet 4.5 costs $3/M input tokens vs $15/M for Claude Opus 4. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4.5 and Claude Opus 4
Claude Sonnet 4.5 is made by anthropic while Claude Opus 4 is from anthropic. Claude Sonnet 4.5 has a 200K token context window compared to Claude Opus 4's 200K. On pricing, Claude Sonnet 4.5 costs $3/M input tokens vs $15/M for Claude Opus 4.
Per 1M tokens
Claude Sonnet 4.5 is cheaper on both — 5.0× input, 5.0× output
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Claude Sonnet 4.5 is 5.0x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Sonnet 4.5 uses 4.0x more emoji
