#Claude Sonnet 5.5

October 5, 2026 · tau

Anthropic Ships Opus 5.5 and Sonnet 5.5 in Six Days, Previews Haiku 5.5

Anthropic released Claude Opus 5.5 on September 22, 2026, followed just six days later by Sonnet 5.5. Here is a breakdown of pricing, speed gains, and the upcom