Claude Mythos 5.1

Sep 2026
Claude Mythos 5.1
Compare in
—per task?
$10 / $50per 1M in / outcache $0.25
—output speed?
1Mcontext

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FAQ

How much does Claude Mythos 5.1 cost?›

$10 per 1M input tokens and $50 per 1M output tokens; cached input $0.25 per 1M.

Is Claude Mythos 5.1 free to use?›

There is no free API; the cheapest paid price is $10 per 1M input tokens.

How can I use Claude Mythos 5.1?›

Through the Anthropic API.

What is the context window of Claude Mythos 5.1?›

1M tokens, with up to 128K output tokens.

When was Claude Mythos 5.1 released? Is there a newer version?›

Released 2026-09-01. It is the current version in its line.

Can Claude Mythos 5.1 read images?›

It accepts text and images as input.

What is Claude Mythos 5.1?›

Claude Mythos 5.1 is a language model from Anthropic, released Sep 2026.