Claude Mythos 5

Q: What is the API model name for Claude Mythos 5?

Use claude-mythos-5 in API calls to Anthropic. The context window is 1M tokens, and a response can run to 128,000 output tokens.

Claude Mythos 5 API pricing is $10 per million input tokens and $50 per million output tokens.

Provider: Anthropic
API model name: claude-mythos-5
Status: Previous generation
Input, $ per 1M tokens: $10.00
Cached input, $ per 1M tokens: $1.00
Output, $ per 1M tokens: $50.00
Sample request (10K in, 2K out), $: $0.20
Context window, tokens: 1M
Price checked on: October 31, 2026
Official pricing page: platform.claude.com

Anthropic offers it separately, by invitation only, as part of Project Glasswing; for access, contact your Anthropic, AWS, or Google Cloud account team. It shares Claude Fable 5’s specifications and pricing. Cached input is billed at $1 per million tokens. A request with 10,000 input tokens and 2,000 output tokens costs about $0.20 before caching or batch discounts. The API model name is claude-mythos-5, and the context window is 1M tokens. Claude Mythos 5.1, the current Mythos model, has the same input and output prices but charges $0.25 for a cache hit.

Cache writes cost $12.50 per 1M tokens for a 5-minute cache and $20 for a 1-hour cache.

Cache writes, $ per 1M tokens: $12.50
Max output, tokens: 128K
Input types: Text, image
Open weights: No
Batch pricing: 50% off input and output tokens
Pricing notes: Offered by invitation only as part of Project Glasswing; for access, contact your Anthropic, AWS, or Google Cloud account team. Cache writes cost $12.50 per 1M tokens for a 5-minute cache and $20 for a 1-hour cache.
Sources: Page URL Checked
Claude API pricing https://platform.claude.com/docs/en/about-claude/pricing 2026-10-19
Claude Mythos 5 model page (context and output limits, access) https://platform.claude.com/docs/en/models/mythos-5/overview 2026-10-04

Page	URL	Checked
Claude API pricing	https://platform.claude.com/docs/en/about-claude/pricing	2026-10-19
Claude Mythos 5 model page (context and output limits, access)	https://platform.claude.com/docs/en/models/mythos-5/overview	2026-10-04

Questions

How much does the Claude Mythos 5 API cost?

Claude Mythos 5 costs $10 per million input tokens and $50 per million output tokens on Anthropic’s own API. Cached input costs $1 per million tokens.

Who can use Claude Mythos 5?

It is offered by invitation only through Project Glasswing. For access, contact your Anthropic, AWS, or Google Cloud account team.

What is the API model name for Claude Mythos 5?

Use claude-mythos-5 in API calls to Anthropic. The context window is 1M tokens, and a response can run to 128,000 output tokens.

What does one Claude Mythos 5 request cost?

A request with 10,000 input tokens and 2,000 output tokens costs about $0.20 at standard rates, before caching or batch discounts. Batch requests get 50% off input and output tokens.

Sources

Prices are read from each provider’s official pricing page: OpenAI, Anthropic, Google Gemini API, xAI, DeepSeek and Mistral AI. Context and output limits that a provider does not publish come from OpenRouter’s model listing. Each model’s Sources field lists the pages used and the date each was checked. How we check prices · Price change log