errors changedapi/errors
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1111* 400 - `invalid_request_error`: There was an issue with the format or content of your request. This error type may also be used for other 4XX status codes not listed in this section. The API also returns a 400 when usage reaches an organization or workspace [spend limit you set](https://platform.claude.com/docs/en/api/rate-limits#setting-your-own-spend-limit), except limits on the [Claude Code workspace](https://platform.claude.com/docs/en/manage-claude/workspaces#claude-code-workspace), which can return a 429 instead.
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13* 401 - `authentication_error`: There's an issue with your API key (for example, it's malformed, revoked, or expired; see [Key expiration](https://platform.claude.com/docs/en/manage-claude/authentication#key-expiration)). On Claude Platform on AWS, this can also indicate a problem with your AWS credentials or SigV4 signature.
13* 401 - `authentication_error`: There's an issue with your [API key](https://platform.claude.com/docs/en/get-api-key) (for example, it's malformed, revoked, or expired; see [Key expiration](https://platform.claude.com/docs/en/manage-claude/authentication#key-expiration)). On Claude Platform on AWS, this can also indicate a problem with your AWS credentials or SigV4 signature.
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1515* 402 - `billing_error`: There's an issue with your billing or payment information. Check your payment details in the [Claude Console](https://platform.claude.com), or in AWS Marketplace if you're using Claude Platform on AWS.
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