Claude Mythos 5

by AnthropicChatretires not before 2027-06-09

Restricted Claude model for advanced cybersecurity and biology research workflows

Context
1M tokens
Max output
128,000 tokens
Released
2026-06-09
Weights
Closed

Feed

anthropic/claude-mythos-5 · also seen as us.anthropic.claude-mythos-5

Specifications

Full facts as recorded, incl. what is unknown.

Released
2026-06-09
Weights
Closed
Input
Text, Image, PDF
Output
Text
Context window
1,000,000 max across endpoints
Max output
128,000
Providers
4
Epoch Capabilities Index
not evaluated
Direct price range
$10 in · $50 out per 1M tokens · 3 of 4 providers have a comparable price
More details
Last updated
2026-06-09
Knowledge cutoff
2026-01-31
Developer country
United States of America

Capabilities

Across all endpoints: supported if any endpoint supports it.

  • Tool calling
  • Parallel toolsunknown
  • Structured output
  • Reasoning
  • Image input
  • PDF input
  • Audio input
  • Audio outputunknown
  • Video input
  • Prompt caching
  • Web searchunknown
  • Computer use
  • System messagesunknown
  • Assistant prefill
  • Temperature
  • Streamingunknown
  • Attachments

Endpoints

One row per provider and variant; gateways are listed separately.

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Price history

Atom feed

No change since 19 Oct 2026. The cheapest direct price has been $10 in / $50 out per 1M tokens at Anthropic on every data refresh since then.

Tracked from 19 Oct 2026, the earliest refresh this model's headline price can be rebuilt from. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON

Cost calculator

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Heads up: prices are indicative list rates scraped from provider pricing pages; verify with the provider before relying on them. Report incorrect data for this model