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Claude Mythos 5

Preview

Limited availability (not GA) via Project Glasswing to approved customers, beginning June 9, 2026. Successor to Claude Mythos Preview. Adaptive thinking always on; no extended thinking. Pricing identical to Fable 5: $10 in / $50 out; 5m cache $12.50, 1h cache $20, cache hits $1/MTok; Batch $5/$25. 1M context at standard pricing. Status set to 'preview' to reflect limited/invite-only availability. Knowledge cutoff not published (null).

Claude Mythos 5 by Anthropic costs $10 per 1M input tokens and $50 per 1M output tokens ($20/1M blended), with a 1M (1.000.000-token) context window. It is in preview.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Provider
Anthropic
Status
Preview
Input price
$10 / 1M tokens
Output price
$50 / 1M tokens
Cached input
$1 / 1M tokens
Blended price
$20 / 1M tokens
Context window
1.000.000 tokens (1M)
Max output
128.000 tokens
Modality
text, image, vision
Open weights
No — API only
Knowledge cutoff
—
Released
9 Jun 2026
API string
claude-mythos-5

Source: Anthropic official documentation ↗

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FAQ

Claude Mythos 5 — questions & answers

How much does Claude Mythos 5 cost?

Claude Mythos 5 is priced at $10 per 1M input tokens and $50 per 1M output tokens ($20/1M blended at a 3:1 input-to-output ratio), with cached input at $1 per 1M tokens.

What is the context window of Claude Mythos 5?

Claude Mythos 5 has a 1.000.000-token context window (1M), with up to 128.000 output tokens per request.

Is Claude Mythos 5 deprecated?

No — Claude Mythos 5 is in preview and not currently scheduled for deprecation or retirement in our tracker.

Does Claude Mythos 5 support image or vision input?

Yes — Claude Mythos 5 accepts image input. Listed modalities: text, image, vision.

Can I self-host Claude Mythos 5?

No — Claude Mythos 5 is proprietary. Its weights are not publicly released, so it is available only through Anthropic's API (or hosted partners), not for self-hosting.

What is the API model string for Claude Mythos 5?

The API model identifier for Claude Mythos 5 is "claude-mythos-5" when calling Anthropic's API.