Anthropic 'Claude Fable 5.5' traces surface in Azure config
A LiteLLM change request added an 'azure_ai/claude-fable-5-5' entry on October 13, but Anthropic has made no official statement about the model.
References to an unreleased Anthropic model labelled 'Claude Fable 5.5' were reportedly found in Azure configuration and in a LiteLLM GitHub change request on October 13, 2026, according to aitimes.com. The model does not appear in Anthropic's official model list as of October 14, and the company has made no official statement about it.
The LiteLLM change request added an 'azure_ai/claude-fable-5-5' entry. Its description states that Azure's model API labels 'Claude Fable 5.5' as Anthropic version 1 and gives its availability status as 'GenerallyAvailable'. Pricing and input/output limits for the model are not yet confirmed, and the information in the file was copied from the existing Fable 5.1 values.
X user Alex Getman claimed that Fable 5.5 appeared in Azure's 'East US 2' region model catalog with a 'GenerallyAvailable' status. Leaker X account leo (@synthwavedd) said on October 13 that Fable 5.5 is slated for release this week.
Routing doubts
Orca Router stated on its blog that appearing in the Azure list does not mean the model is actually usable. TestingCatalog previously reported that some users of 'Opus 5.5' suspect requests are being routed to an undisclosed model, sharing outputs such as code-based animation.
Quick answers
Is Claude Fable 5.5 officially released?
No. As of October 14, 2026, Claude Fable 5.5 is not listed in Anthropic's official model list, and Anthropic has made no official statement about the model.
Where were traces of Claude Fable 5.5 found?
They were reportedly found in Azure configuration and in a LiteLLM GitHub change request, both dated October 13, 2026.
Does the Azure listing confirm the model works?
Orca Router stated on its blog that appearing in the Azure list does not mean the model is actually usable.