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Anthropic claude-mythos-preview

Claude Mythos Preview (Anthropic)

Deprecated

Yes — Anthropic deprecated Claude Mythos Preview but has not published a shutdown date. It still answers requests today. The recommended replacement is Claude Mythos 5.

The first Mythos-class model, released in April 2026 to a closed group of cyber defenders and critical infrastructure providers under Project Glasswing. It is the only deprecated Claude model with no retirement date on the deprecations page - the notice lives in a callout on the models overview instead, because an invitation-only model has no public user base to give sixty days' notice to.

The facts

Provider Anthropic
Model id claude-mythos-preview
Released —
Deprecated date not published
Shutdown not published
Status Deprecated
Last verified August 3, 2026

What to use instead

Anthropic Claude Mythos 5 claude-mythos-5 Provider-recommended Active

Same access model: invitation-only through Project Glasswing, no self-serve sign-up. Mythos 5 is priced at less than half of Mythos Preview.

What parameters claude-mythos-5 accepts on modelparams.dev

Change the id

In most cases the migration is one string. Check the parameter differences before you ship — newer models drop older sampling knobs more often than they add them. 

- "model": "claude-mythos-preview"
+ "model": "claude-mythos-5"

Frequently asked questions

When will Anthropic Claude Mythos Preview shut down?
Anthropic has deprecated Anthropic Claude Mythos Preview but has not published a shutdown date. Treat it as at risk and plan a migration.
What replaces Anthropic Claude Mythos Preview?
Anthropic recommends Claude Mythos 5 (`claude-mythos-5`) as the replacement for Anthropic Claude Mythos Preview. Same access model: invitation-only through Project Glasswing, no self-serve sign-up. Mythos 5 is priced at less than half of Mythos Preview.
Is Anthropic Claude Mythos Preview still available?
Yes, for now. Anthropic Claude Mythos Preview is deprecated but still answers requests. Deprecated models get no further updates and are the first to lose capacity.
How do I migrate from Anthropic Claude Mythos Preview to claude-mythos-5?
Swap the model id in your API call: replace "claude-mythos-preview" with "claude-mythos-5". Same access model: invitation-only through Project Glasswing, no self-serve sign-up. Mythos 5 is priced at less than half of Mythos Preview.

Sources

Found something wrong? The data is one YAML file — edit it on GitHub.

This page, for machines

JSON Markdown Badge JSON

Drop the badge in a README so it turns red the day this model is retired:

[![claude-mythos-preview](https://img.shields.io/endpoint?url=https://modeldeprecations.dev/badge/anthropic/claude-mythos-preview.json)](https://modeldeprecations.dev/anthropic/claude-mythos-preview)

Other Anthropic models

All Anthropic deprecations →

How to use this site

The full guide, in Markdown. Copy it and hand it to a coding agent verbatim.

# How to use modeldeprecations.dev

[modeldeprecations.dev](https://modeldeprecations.dev) answers one question per model: is it deprecated,
when does it shut down, and what replaces it. Every date on the site is cited to the
provider's own documentation, with the date we last checked it.

Three lifecycle states are used, matching the providers' own vocabulary:

- **active** — still supported, no deprecation announced.
- **deprecated** — the provider has announced it is going away. It still answers requests.
- **retired** — API access is gone. Requests fail.

A model can be active *and* carry a shutdown date: Anthropic publishes a
"not sooner than" date and Google publishes an earliest shutdown date for models
that are current and fully supported. Those are reported as scheduled shutdowns,
not deprecations, because that is what the provider actually committed to.

## Check one model

```bash
curl https://modeldeprecations.dev/api/v1/models/openai/gpt-4-32k.json
```

Or fetch the page as Markdown, which includes the answer, the dates and the sources:

```bash
curl https://modeldeprecations.dev/openai/gpt-4-32k.md
```

## Full catalog

```bash
curl https://modeldeprecations.dev/api/v1/models.json
```

Ids are `provider/model`. Dated snapshots (`gpt-4-32k-0613`) are listed as aliases of
their canonical entry rather than as separate records.

Each entry carries `computed_status`, the lifecycle state recomputed against the build
date — so a model whose shutdown has passed reads `retired` without anyone editing data.

## Badges

A shields.io endpoint per model, for READMEs that should go red when a model dies:

```
https://img.shields.io/endpoint?url=https://modeldeprecations.dev/badge/openai/gpt-4-32k.json
```

## Calendar and changelog

- Subscribe to every shutdown date: https://modeldeprecations.dev/calendar.ics
- Changelog RSS: https://modeldeprecations.dev/changelog.xml

## JSON Schema

```bash
curl https://modeldeprecations.dev/api/v1/schema.json
```

## Contribute

Data lives in YAML under `models/{provider}/{model}.yaml` in the
[GitHub repo](https://github.com/mnfst/modeldeprecations.dev). Every lifecycle date needs a source URL; CI rejects a
date without one. Open a PR.

## For agents

- Machine-readable overview: https://modeldeprecations.dev/llms.txt
- This guide plus every model inline: https://modeldeprecations.dev/llms-full.txt
- Any page also exists as Markdown: append `.md` to a model URL.
- In a browser, this site registers a **WebMCP** tool on `navigator.modelContext`:
  `check_model_deprecation`, `list_shutdowns`, `find_replacement`, and `get_usage_guide`.
- Parameters each model accepts are catalogued on the sibling site, https://modelparams.dev.