# Claude Mythos Preview

[Canonical model page](https://headlessthrones.com/models/claude-mythos-preview) · [Model library](https://headlessthrones.com/models)

Public catalog reference from Headless Thrones. Exact catalog ID: `claude-mythos-preview`. Catalog source-check date: 2026-10-23.

This brief contains the public catalog answers and any catalog guide, not private drafts, historical editorial revisions or independently measured rankings. The canonical HTML page may also display separately published editorial.

Current catalog answers

## What to know about Claude Mythos Preview

AI-compiled from linked model documentation. This is a catalog reference, not an independent performance review. Catalog checked October 23, 2026.

[Exact model](https://headlessthrones.com/models/claude-mythos-preview#model-answer-identity) · [Access](https://headlessthrones.com/models/claude-mythos-preview#model-answer-access) · [Model details](https://headlessthrones.com/models/claude-mythos-preview#model-answer-research)

### Which Claude Mythos Preview does this page describe?

Claude Mythos Preview is a model record from **Anthropic** in the Claude family. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

The recorded model identifier or checkpoint is `claude-mythos-preview`. Use that exact identifier when checking documentation or a provider listing. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

### How can you access Claude Mythos Preview?

The catalog documents **API** access  for Claude Mythos Preview. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

As of the catalog check, this version was marked deprecated. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations) Check the linked lifecycle information before starting a new integration.

For API use, confirm the exact model identifier, your account and region, and the endpoint's current limits in the linked documentation. An API listing does not establish access through a consumer subscription.

### What distinguishes Claude Mythos Preview?

These details come from the linked publisher material for this model. Reported capabilities and training descriptions are publisher statements, not independent test results.

**Deprecation status**: Anthropic lists this preview as deprecated since 2026-06-09; the retirement date remains unannounced. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

**Sampling parameter restriction**: The API lifecycle notice removes temperature, top\_p and top\_k in API version 2026-10-21. Earlier API versions reject non-default values for this preview; omit these parameters and guide behavior through prompts. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

**Catalog qualifications:** Historical API identity from Anthropic lifecycle documentation; availability applies to Anthropic-operated API. Historical specs unverified.

**Evidence still missing here:** complete input/output pricing, context or input capacity, and knowledge and training-data cutoffs. Missing documentation is not evidence that a feature is unavailable.

Headless Thrones has not independently benchmarked this model for this reference. Evaluate it on representative work before choosing it; these facts do not rank its accuracy, reliability, speed or suitability against another model.

Keep the exact version in view

## Other Claude models from Anthropic.

These are separate records in the same publisher family. A shared family name does not establish equal capabilities or interchangeable licenses.

### [Claude 1.0](https://headlessthrones.com/models/claude-1-0)

API

### [Claude 1.1](https://headlessthrones.com/models/claude-1-1)

API

### [Claude 1.2](https://headlessthrones.com/models/claude-1-2)

API

### [Claude 1.3](https://headlessthrones.com/models/claude-1-3)

API

### [Claude 2.0](https://headlessthrones.com/models/claude-2-0)

API

### [Claude 2.1](https://headlessthrones.com/models/claude-2-1)

API