claude-mythos-preview marked deprecated

What changed

Impact summary

Anthropic's model status page marks claude-mythos-preview as deprecated and points developers to claude-mythos-5.

BeforeClaude Mythos Preview

After / replacementclaude-mythos-5

Affected models and systems

claude-mythos-preview

Migration action

Recommended next step: Move evaluation and production traffic to claude-mythos-5. Use the stated date field for timing; do not infer a retirement date where none is recorded.

Source and interpretation

API platform & regional scope

Anthropic Claude API · Direct developer platform; eligibility and regional restrictions are account-specific.

Not AWS Bedrock or Vertex AI.

Bounded manual catalog. Original event checks retained from 2026-09-01; not reverified in this expansion.

Unconfirmed regions are not assumed to be global. Automatic monitoring is OFF. Source checks

Official evidence locators

Existing normalized record: evt_anthropic_mythos_preview. Locate listed affected model(s) in the lifecycle/release table; original manual check retained.

Original source date and qualifier retained; exact shutdown time is not inferred.

Affected endpoints: Not separately specified; check model / capability scope

Action / deadline: Review required · No stated deadline

This record is classified as official announcement. The facts above were normalized from the provider's public developer documentation. API Change Watch does not treat an unreviewed page diff as a verified announcement.

Read the official source ↗