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Anthropic modelcard now lists Claude Fable 5 and invitation-only Claude Mythos 5.
The read
Model routing tables need new Anthropic IDs and access gating separated for Fable 5 and Mythos 5.
The frame
Fable 5 uses claude-fable-5. Mythos 5 uses claude-mythos-5 and sits inside Project Glasswing.
Primary source
Anthropic modelcard →Keep reading
See what Nova3 builds →Related updates
- Jul 27, 2026Frontier vendors expanded runtime surfaces while removing public plan and model-routing signals.
- Jul 26, 2026OpenAI updated GPT-5.5 Instant to improve conversational quality in decision, advice, planning, research, and shopping tasks.
- Jul 25, 2026Enterprise and Edu users can find skills under Plugins, on the Skills tab in the Plugin Directory.
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