You'll notice
Useful3 Signal2
Structured-output failures now tell you when a model fallback caused the retraction.
What's wrong with this entry?
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What
When a structured output is retracted because the request fell back to another model, the failure message now counts those retracted attempts separately, and there is a dedicated message for when no retry ever produced a valid result.
Evidence
Structured output was retracted by a model fallback and no retry produced a valid result
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
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v2.1.229
Clearer message when a request is rejected as too large
Both mention error message
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v2.1.228
API rejections are classified from a structured marker instead of prose alone
Both mention error
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v2.1.234
Empty or malformed API responses now report what actually answered
Both mention error