* Python: fix per-run additional_beta_flags leaking into Anthropic request kwargs
_prepare_options copied every key from the caller-supplied options dict
into run_options except "instructions" and "response_format". A
per-run additional_beta_flags value is correctly folded into the betas
set by _prepare_betas, but the raw key was never excluded, so it
survived into run_options and was forwarded straight through to
AsyncMessages.create(), which rejects it with TypeError: got an
unexpected keyword argument 'additional_beta_flags'. Add it to the
exclusion set alongside the other framework-level keys.
Fixes#5764
* Exclude additional_beta_flags from filtered_kwargs too
Copilot's review on the original fix pointed out the exclusion only
covered the options-dict copy, not kwargs passed directly to
_prepare_options — so additional_beta_flags supplied as a raw kwarg
would still leak through and reproduce the same TypeError. Add the
same exclusion to filtered_kwargs for consistency, with a regression
test covering the kwarg path.
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Co-authored-by: Chris Brown <albatrossflyon1@gmail.com>
Chris Brown
b5300fe0c0