# Claude Mythos Preview deprecation

entity: /record/claude-mythos-preview.md  
predicate: deprecated  
page: /record/claude-mythos-preview/deprecated  
as_of: 2026-11-04  

As of November 4, 2026, the AsOf record says Claude Mythos Preview was deprecated on June 9, 2026 (as claude-mythos-preview), from a primary source (platform.claude.com). The record holds 1 claim on Claude Mythos Preview's deprecation, 1 still open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted.

## Current deprecation

What the record asserts on 2026-11-04.

- [Claude Mythos Preview](/record/claude-mythos-preview.md) | deprecated | claude-mythos-preview | valid 2026-06-09 to present | conf 0.95 | valid | [clm_C2876AD1EB33](/claim/clm_C2876AD1EB33.md)
  sources: https://platform.claude.com/docs/en/about-claude/model-deprecations

## Every dated value

One claim per line, oldest first. Superseded claims stay visible.

- [Claude Mythos Preview](/record/claude-mythos-preview.md) | deprecated | claude-mythos-preview | valid 2026-06-09 to present | conf 0.95 | valid | [clm_C2876AD1EB33](/claim/clm_C2876AD1EB33.md)
  sources: https://platform.claude.com/docs/en/about-claude/model-deprecations

## Questions this record answers

### When was Claude Mythos Preview deprecated?

On June 9, 2026 (as claude-mythos-preview), from a primary source (platform.claude.com) (status valid, confidence 0.95).


## Get this data

- JSON: /v1/entities/claude-mythos-preview/deprecated (this fact) · /v1/entities/claude-mythos-preview?predicates=deprecated (with the entity's coverage; add as_of=YYYY-MM-DD for a date)
- MCP: timeline(entity: "claude-mythos-preview", predicates: ["deprecated"]) for every dated value · fetch(id: "/record/claude-mythos-preview/deprecated.md") for this page
- Entity twin: /record/claude-mythos-preview.md · timeline: /timelines/claude-mythos-preview.md

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.