Mid-conversation system messages available on Claude Fable 5, Mythos 5 and Opus 4.8

GAJul 15, 2026VerifiedAdded Sep 22, 2026

Mid-conversation system messages work on Claude Fable 5, Mythos 5 and Opus 4.8 on the Claude API, Amazon Bedrock and Google Cloud with no beta header required, correcting earlier availability notes.

LLMs Developer tools

Read Anthropic's release notes

https://platform.claude.com/docs/en/release-notes/overview#july-15-2026

Summaries of vendors' own notes. Product names and logos belong to their owners; logos via logo.dev.

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