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Claude Opus vs Sonnet vs Haiku: Which Should You Use?

OpenRouter ·

Summary: Use Claude Sonnet 5.5 as your default, Haiku 5.5 for high-volume and sub-agent work, and Opus 5.5 for long tasks where a mistake is costly. We compared the three on price, benchmarks, 11 coding tasks with hidden tests and a Claude Code bug fix. All three passed everything, so the difference was cost.

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This is a summary of a story first published by OpenRouter on 30 Oct 2026. Read the full article at the source link.

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