Anthropic launches Claude Sonnet 5.5: 30%+ faster, up to 30% cheaper for most work
claudeai · x · 2026-09-29
Anthropic officially announces Claude Sonnet 5.5, the second model in the Claude 5.5 family. The company calls it a clear upgrade over Sonnet 5: it runs more than 30% faster and costs up to 30% less for most work. Claude Haiku 5.5, aimed at high-volume, cost-sensitive applications, will join the family in the coming weeks.
Related event: Anthropic Launches Claude Sonnet 5.5: 30% Faster, Up to 30% Cheaper(30 posts)→
More from Models
- Bindu Reddy: Sonnet 5.5 Scores Below Terra, Stick to DeepSeek Flash — bindureddy · 2026-09-29
- Early-access user claims Sonnet 5.5 is a colossal leap over Sonnet 5 and blazing fast — rudrank · 2026-09-29
- Meta finds AI judges prefer AI slop — bad news as agencies score proposals with AI — jmugan · 2026-09-29
- OpenAI Teases Major Announcement With Cryptic 'Get Ready' Post — OpenAI · 2026-09-29
- Claude Sonnet 5.5 lands in Rork, generating output over 30% faster than Sonnet 5 — rudrank · 2026-09-29
- AI models' viral demo appeal is underpriced, argues founder who picked Opus over better-per-dollar rival — gabriel1 · 2026-09-29