Unverified50% confidencePredictionExact time
According to a leak by Testing Catalog, Anthropic partners have obtained access to Claude Fable 5.5, which is expected to be released next week; traces of Fable 5.5 have also appeared in the Microsoft Azure catalog and in LightLM.
1
Sources
50%
Confidence
Short-term (~14 days)
Relevance
10/18/2026
First Seen
Valid until: 11/1/2026
Sources
23 AI Technologies Slated for Export Control: How Are API and Open Source Defined?
bilibili绿鸭Lvya10/17/2026
Related Entities
Related Claims
UnverifiedIn Claude apps gateway sessions, fable and best will still resolve to Fable 5; users need to manually select 5.1 in /model to enable the new model.70% similarUnverifiedAnthropic's next-generation frontier model Claude Fable 5.2 is reportedly ready and is regarded as a significant upgrade over Fable 5.1.63% similarUnverifiedThe Databricks model library includes Claude Opus 5.5, Claude Fable 5.1, and more than 60 open-source and frontier models.63% similarUnverifiedClaude Fable 5.1 belongs to the Mythos tier of the Claude 5 family and shares the same underlying architecture as Claude Mythos 5.1.62% similar
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