{"version":"2.1.242","anchor":"server-side-refusal-fallbacks-documented-as-supported-on-cla","canonical_anchor":"server-side-refusal-fallbacks-documented-as-supported-on-cla","heading":"Server-side refusal fallbacks documented as supported on Claude Platform on AWS","tier":"notice","area":"Model Docs","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.242\/e\/server-side-refusal-fallbacks-documented-as-supported-on-cla","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.242","markdown":"### Server-side refusal fallbacks documented as supported on Claude Platform on AWS\n\nServer-side refusal fallbacks are now documented as working on Claude Platform on AWS, not just the Claude API.\n\n**What**\n\nThe `fallbacks` request parameter, which lets the server retry a refused request against another model, is now documented as available on the Claude API and Claude Platform on AWS. It was previously Claude-API-only with AWS support described as still being validated.\n\n**Details**\n\n- Bedrock, Vertex and Foundry are still excluded and keep the client-side middleware instead.\n- A new row in the platform-availability table names both beta headers: `server-side-fallback-2026-07-01` for the `\"default\"` form and `server-side-fallback-2026-06-01` for the array form.\n\n**Evidence**\n\n`available on the Claude API and Claude Platform on AWS`\n\n- Area: Model Docs\n- Names: `fallbacks`\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 4\/5"}