How much does Claude Mythos 5.1 cost per 1M tokens?

Claude Mythos 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens on the standard tier. Cached input is $0.250 per 1M.

What is Claude Mythos 5.1's context window?

Anthropic does not publish a context window for Claude Mythos 5.1 on its pricing page.

Yes. Claude Haiku 3.5 is $0.800 per 1M input tokens versus $10.00 for Claude Mythos 5.1.

Directly from Anthropic's published pricing page, re-read every day and normalized to USD per 1,000,000 tokens.

Claude Mythos 5.1 from Anthropic costs $10.00 per 1M input tokens and $50.00 per 1M output tokens. Cached input is $0.250 per 1M.

API id claude-mythos-5.1 · Anthropic · source · updated 2026-09-25 · general-purpose

$10.00

Input / 1M tokens

$50.00

Output / 1M tokens

$0.250

Cached input / 1M

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Context window

Estimated cost at common usage volumes
Workload	Input tokens	Output tokens	Estimated cost
Short chat turn	1,000	500	$0.04
Document summary	50,000	2,000	$0.60
1M tokens in, 200K out	1,000,000	200,000	$20.00

Estimates use the standard tier and ignore caching discounts, so real bills with repeated prompt prefixes are typically lower.

How much does Claude Mythos 5.1 cost per 1M tokens?: Claude Mythos 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens on the standard tier. Cached input is $0.250 per 1M.
What is Claude Mythos 5.1's context window?: Anthropic does not publish a context window for Claude Mythos 5.1 on its pricing page.
Is there a cheaper Claude model than Claude Mythos 5.1?: Yes. Claude Haiku 3.5 is $0.800 per 1M input tokens versus $10.00 for Claude Mythos 5.1.
Where does this Claude Mythos 5.1 price come from?: Directly from Anthropic's published pricing page, re-read every day and normalized to USD per 1,000,000 tokens.