Claude Sonnet 5.5

Specifications

No specifications recorded yet.

Latest developments

September 2026

◆ Anthropic releases Claude Sonnet 5.5, a faster and cheaper workhorse model with Opus-level security safeguards Model release

• 28 Sep Anthropic debuts Claude Sonnet 5.5 running 30% faster than the previous-generation AI model
• 28 Sep Anthropic launches Claude Sonnet 5.5 with near-Opus performance at half the price
• 28 Sep Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner

Relationships

Products & technology

• Anthropic develops this model · 2 sources
• Derived from Claude Sonnet 5 · 1 source
• Anthropic deploys this model · 1 source

Competition

• Competes with Claude Sonnet 5 · 1 source