A 36Kr repost of a New Intelligence Era (新智元) report says a model entry named azure_ai/claude-fable-5-5 appeared in Microsoft Azure's East US 2 catalog listed as Generally Available, while the open-source project LiteLLM synced a matching configuration, which observers read as a signal that Anthropic's next model is close to launch. The leaked specifications describe a 1M-token context window, up to 128K output tokens, and API pricing of $10 per million input tokens and $50 per million output tokens. The report cautions that a GA listing in Azure's catalog does not equal an official announcement, and that LiteLLM following cloud catalogs is routine, so it does not count as a second independent source. It also cites an Anthropic engineering blog saying internal code merges grew from about 2,500 per day in May to more than 30,000 per day in September, and speculates from that figure that Fable 5.5 may have been produced through AI self-iteration — a claim offered by the author and commenters, not confirmed by Anthropic.

Anthropic·Claude Fable 5.5·Microsoft Azure·+5