<blockquote cite="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-5"><p>Claude Fable 5 and Claude Mythos 5 were first released on June 9, 2026. On June 12, 2026, Anthropic suspended access t…
New models reset the capability and price-performance frontier. Teams re-evaluate what to build on whenever a launch shifts what's possible per dollar.
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