{"version":"2.0.77","anchor":"custom-betas-validation-for-api-users","canonical_anchor":"custom-betas-validation-for-api-users","heading":"Custom Betas Validation for API Users","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.0.77\/e\/custom-betas-validation-for-api-users","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.0.77","markdown":"### Custom Betas Validation for API Users\n\n**What**\n\nAPI key users can now specify custom beta headers, with validation against an allowlist.\n\n**Details**\n\n- Only the `context-1m-2025-08-07` beta is currently allowed\n- Warnings are shown for disallowed beta headers\n- OAuth users cannot use custom betas (server-controlled)\n\n**Evidence**\n\n`JrQ()` at line 140738 (beta validation, contains `\"Custom betas are only available for API key users\"`)"}