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← Back to all updatesPublished ·Anthropic◆ Critical
Anthropic removed Claude Fable 5 and Mythos 5 modelcard guidance.
The read
Critical: builders should recheck model IDs and routing assumptions against the current Anthropic page.
The frame
Removed text listed `claude-fable-5`, `claude-mythos-5`, and Opus 4.8 as the starting point for complex tasks.
Primary source
Anthropic modelcard →Keep reading
See what Nova3 builds →Related updates
- Jun 26, 2026Anthropic modelcard removed model overview content for Claude Fable 5 and Mythos 5
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- Jun 25, 2026OpenAI updated GPT-5.5 Instant to improve conversational quality, context carryover, and complex instruction following.
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