What
The usage information attached to each API response, which records things like how many tokens a request used, now has a fallback_credit field.
fallback_creditis optional in the usage schema. It is described as the outcome of a fallback-credit token the request presented, or null.- It defaults to null and is carried through when usage from several requests is combined.
Why
This is a data change that most people will not see directly. If you read the usage data Claude Code records or reports, expect a new fallback_credit field. It will be null unless a request presented a fallback-credit token.
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The writer flagged doubt
It is not clear how the fallback_credit value is used.