ForecastAnthropiclanguage model

Claude Sonnet 5.6 has not been announced. Based on how often Anthropic ships new versions, our forecast is that it arrives around February 8, 2027, probably between December 16, 2026 and April 28, 2027.

The forecast

Most likely	February 8, 2027
Window	December 16, 2026 to April 28, 2027
Chance it arrives in that window	About 42%
Follows	Claude Sonnet 5.5 (out September 28, 2026)
Based on	2 earlier gaps between versions

How we got this

Anthropic is the maker of Claude Sonnet 5.5. We look at the gaps between its earlier versions (Claude Sonnet 4.6, 2026-02-17; Claude Sonnet 5, 2026-06-30; Claude Sonnet 5.5, 2026-09-28) and project the next one. It is a guess from a pattern, not news: the maker has not said Claude Sonnet 5.6 exists. This page turns into the launch page, with price and facts, as soon as the model shows up on OpenRouter, Hugging Face or GitHub.

Available now from Anthropic

Predicted automatically by Modelcast. Not affiliated with Anthropic.