SOURCE-LINKED INTELLIGENCE
Claude Platform Release Notes: Mid-conversation system messages are available on Claude Fable 5, Claude Mythos 5, and Claude Opus 4.8, on the Claude API, Claude in Amazon Bedrock, and Google Cloud.
Mid-conversation system messages are available on Claude Fable 5, Claude Mythos 5, and Claude Opus 4.8, on the Claude API, Claude in Amazon Bedrock, and Google Cloud. No beta header is required. This corrects earlier availability notes.
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- recordType
- page-entry
- evidenceStatus
- publisher-reported
- region
- Global
Evidence & attribution
- Claude Platform Release Notes · 2026-07-15T00:00:00.000Z
First collected: 2026-09-23T00:41:11.323Z. This is not the publication date.