ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins81% CONFIDENCEOverall confidence: 81%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or betterin 10 daysEstimated: Anthropic's[2][5][6] 28 September Sonnet 5.5 post says Claude[3] Haiku 5.5 "will join the Claude 5.5 family in the coming weeks" and TechCrunch[4] says it gave no firm date; last generation, Anthropic's own pages date Sonnet 4.5 to 29 September 2025 and Haiku 4.5 to 15 October 2025, 16 days later, and 16 days after Sonnet 5.5 is Wednesday 14 October 2026, the same weekday Haiku 4.5 launched.
Anthropic's Claude Haiku 5.5, the small, low-cost model of the Claude 5.5 family, is expected in mid-October 2026 after Anthropic said it would follow Opus 5.5 and Sonnet 5.5 "in the coming weeks".
