Amazon Bedrock has begun returning a 404 "Model not found" error for the suspected Anthropic Fable 5.1 model ID. Randomly entered model names still yield a 400 error, while Fable 5.1 now returns 404. Per AWS error code definitions, this suggests Fable 5.1 has been added to the Bedrock backend and preparations for launch are underway.
Amazon Bedrock is now throwing a 404 “Model not found” error for the model ID thought to be Anthropic Fable 5.1 — the name passed in the API. Try a random model name and you still get a 400 error. But Fable 5.1? Now it’s 404.
AWS error code rules point to a simple read on this: Fable 5.1 has likely been loaded into the Bedrock backend, and launch prep is moving ahead.
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