Claude Platform clarifies advisor tool compatibility limitation for the Fable 5.2 and Mythos 5.2 models
Anthropic has documented that in the beta advisor tool feature in Claude Platform, an executor with the Claude Fable 5.2 or Claude Mythos 5.2 model accepts only one of these two models as the advisor. Any other combination returns an HTTP 400 error.
Anthropic has clarified the documentation for the advisor tool feature in Claude Platform, which is still in beta. According to the documentation, if the executor is set to the Claude Fable 5.2 or Claude Mythos 5.2 model, it accepts only one of these two models as the advisor. Specifying a different model as the advisor results in an HTTP 400 error.
The documentation further states that this does not apply symmetrically in reverse: all other executor models, conversely, accept Claude Fable 5.2 as their advisor without any issue. Anthropic recommends that when switching the executor to the Fable 5.2 or Mythos 5.2 model, the advisor's model should be set to one of these two models to avoid the error.
See the source article for details.
Why it matters
This is a technical clarification for developers using the beta advisor tool feature in Claude Platform. Without knowing about this limitation, they could encounter a 400 error when switching the executor to the Fable 5.2 or Mythos 5.2 model if they set the advisor to an incompatible model.
Relevant practical impact
What this means
For a business
Teams integrating the advisor tool in Claude Platform must, when switching the executor to the Claude Fable 5.2 or Claude Mythos 5.2 model, ensure that the advisor uses one of these two models, otherwise the API call will fail with an HTTP 400 error.
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