All modelsMODEL / FRONTIER COVERAGEClaude Sonnet 5TYPEModelSIGNALS3FIRST SEENSep 20, 2026LAST SEENSep 28, 2026ALSO KNOWN ASSonnet 5Recent signalsAnthropic releases Sonnet 5.5, saying it generates outputs 30%+ faster than Sonnet 5 and costs up to 30% less per task, and plans to release Haiku 5.5 soon (Anthropic) Sep 28, 2026Introducing Claude Sonnet 5.5 Sep 27, 2026Vercel, Cloudflare, and others quickly add Jev, as it makes AI tool selection much faster and cheaper; TypeSafe: Jev matches GPT-5.6 and Sonnet 5 workflow evals (Josipa Majic Predin/Forbes) Sep 20, 2026RELATEDClaude Sonnet 5.5AnthropicGPT-5.6VercelJevClaude Opus 5.5CloudflareClaude Haiku 5.5ALL MODELSLATEST SIGNAL