Modelpeers

Claude Mythos Preview

Model at Anthropic

Retiring

Claude Mythos Preview deprecated, retirement date to be announced

The model deprecations table lists claude-mythos-preview as deprecated on June 9, 2026, the day Mythos 5 launched as its upgrade. No retirement date has been set.

Who is affected:
Project Glasswing partners using Claude Mythos Preview.
What to do:
Plan a move to Claude Mythos 5.1.

Source

"| claude-mythos-preview | Deprecated | June 9, 2026 | To be announced |"

Claude docs: Model deprecations

Published

Open the sourceplatform.claude.com

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