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Anthropic

Claude Mythos 5 API Pricing

Same specs/pricing as Claude Fable 5. Limited availability, invitation-only via Project Glasswing (defensive cybersecurity workflows); no self-serve sign-up. Cache write 1h-TTL is $20.00/MTok. Batch: $5.00/$25.00 per MTok.

Verified against Anthropic’s pricing page on 2026-07-02.

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Facts

Specs

  • FamilyClaude Fable
  • API IDclaude-mythos-5
  • ModalityMultimodal
  • Context window1M tokens
  • Max output128K tokens
  • Release date2026-06-09

Pricing (per 1M tokens)

  • Input$10.00 / 1M tokens
  • Output$50.00 / 1M tokens
  • Cached input$1.00 / 1M tokens
  • Cache write$12.50 / 1M tokens
  • Batch discount50%

Capabilities

vision, tool-use, adaptive-thinking-always-on, multilingual

Notes

Same specs/pricing as Claude Fable 5. Limited availability, invitation-only via Project Glasswing (defensive cybersecurity workflows); no self-serve sign-up. Cache write 1h-TTL is $20.00/MTok. Batch: $5.00/$25.00 per MTok.

Worked cost examples

Estimated monthly cost on three common usage shapes

WorkloadEst. monthly cost

Chatbot

800 input / 200 output tokens per request, 100,000 requests/month

$1,800

RAG pipeline

6,000 input / 700 output tokens per request, 30,000 requests/month

$2,850

Batch summarization

20,000 input / 1,500 output tokens per request, 5,000 requests/month

$1,375

Price history

Changes we have documented since we began tracking

No price changes recorded since we began tracking.

Claude Mythos 5 pricing FAQ

How much does Claude Mythos 5 cost per 1M tokens?
Claude Mythos 5 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens.
How much does Claude Mythos 5 cost per request?
A typical request of 800 input and 200 output tokens costs about $0.018 on Claude Mythos 5.
Is Claude Mythos 5 cheaper than Claude Fable 5?
Claude Mythos 5 and Claude Fable 5 charge the same per input token.
Does Claude Mythos 5 have cache pricing?
Yes — cached input reads cost $1.00 per 1M tokens, and cache writes cost $12.50 per 1M tokens.

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