Claude Opus vs Sonnet vs Haiku: Which Should You Use?
Article image or reusable cover for OpenRouter
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.
The text is the source's own description of its publication. The content belongs to OpenRouter.
More to read
Build an AI Code Reviewer with OpenRouter
OpenRouter 7 h ago
Lumaril, which develops AI software for optimizing industrial production by connecting to existing control systems, raised a $66M Series A at a $400M valuation
Techmeme 2 h ago
DeepSeek open sources Super-Agent as a research prototype, a proactive coding agent it says can monitor group chats for coding issues and suggest solutions
Techmeme 2 h ago
Insurance software maker Guidewire agrees to acquire Hyperexponential, which makes AI-powered insurance underwriting and pricing software, for $1.7B in cash
Techmeme 2 h ago