# Claude Sonnet 5.5 matches Opus 5.5 on coding tests at half the price

> Original title: Claude Opus vs Sonnet vs Haiku: Which Should You Use?

- Source: OpenRouter Blog
- Published: 2026-10-30T00:00:00.000Z
- Bad Influence: https://badinfluence.news/items/dehjuvf9klie9jcm3ytgtqp6c
- Original: https://openrouter.ai/blog/insights/claude-opus-vs-sonnet-vs-haiku/

## Summary

OpenRouter tested Claude Opus 5.5, Sonnet 5.5, and Haiku 5.5 on 11 coding tasks with hidden tests and all three passed every one. Sonnet 5.5 scored higher than Opus 5.5 on GPQA Diamond (92.4% vs 90.4%) and τ-bench airline (78.7% vs 75.5%) at half the per-token price, while Haiku 5.5 cost about a 19th to a 30th as much as Opus per coding task.