Claude Sonnet 5.5
Anthropic released Claude Sonnet 5.5 on 28 September 2026, the second model in the Claude 5.5 family; Anthropic says it runs 30%+ faster and costs up to 30% less for most work.
Tool Overview
Features, steps and FAQ below
Features
- ✓ Anthropic says Claude Sonnet 5.5 is the second model in the Claude 5.5 family and a clear upgrade over Claude Sonnet 5, running 30%+ faster
- ✓ Anthropic says its pricing is unchanged at $2 per million input tokens and $10 per million output tokens, but because it needs fewer tokens for the same work, most work costs up to 30% less
- ✓ Anthropic says Sonnet 5.5 is strongest at well-scoped everyday tasks, fixing bugs, and creating polished documents, slides and spreadsheets, and it has a sharp eye for design
- ✓ Anthropic says Sonnet 5.5 is a faster, lower-cost complement to Claude Opus 5.5, which remains better for complex, open-ended work requiring careful judgment
- ✓ Anthropic says Claude Haiku 5.5 will join the Claude 5.5 family in the coming weeks, built for high-volume and cost-sensitive applications
How to Use
- Visit the official Anthropic Claude Sonnet 5.5 page (anthropic.com/claude-sonnet-5-5) to review capability comparisons and benchmarks
- Select Sonnet 5.5 in the Claude app or the Claude API; Anthropic says it is a drop-in upgrade from Sonnet 5
- Match the model to the task: Anthropic says Sonnet 5.5 suits well-scoped everyday work while Opus 5.5 suits complex, open-ended work
- Watch for Claude Haiku 5.5 from Anthropic for high-volume, cost-sensitive batch use cases
FAQ
What is Claude Sonnet 5.5?
Anthropic says Claude Sonnet 5.5 is the second model in the Claude 5.5 family, released on 28 September 2026, and a clear upgrade over Claude Sonnet 5.
Is Sonnet 5.5 faster and cheaper?
Anthropic says it runs 30%+ faster at the same $2/$10 per million input/output token pricing, but most work costs up to 30% less because it needs fewer tokens.
How do I choose between Sonnet 5.5 and Opus 5.5?
Anthropic says Sonnet 5.5 is a faster, lower-cost complement to Opus 5.5 and is strongest at well-scoped everyday tasks, while Opus 5.5 remains better for complex, open-ended work.
How does Sonnet 5.5 perform on benchmarks?
Anthropic says Sonnet 5.5 has a sharp eye for design and trades wins with Opus 5.5 across its published comparisons, while Opus 5.5 remains clearly stronger on complex open-ended work.
Is there a smaller model?
Anthropic says Claude Haiku 5.5 will join the Claude 5.5 family in the coming weeks, built for high-volume and cost-sensitive applications.