Claude Mythos 5.1 Pricing
Anthropic · Live
Claude Mythos 5.1 costs $10 per million input tokens and $50 per million output tokens on the Anthropic API. Cached input reads are billed at $0.25 per million tokens. Pricing verified October 8, 2026.
Claude Mythos 5.1 API pricing
Claude Mythos 5.1 API pricing is $10 per million input tokens and $50 per million output tokens, verified October 8, 2026.
- Input (per 1M tokens)
- $10
- Output (per 1M tokens)
- $50
- Cached input (per 1M tokens)
- $0.25
- Cache write, 5m TTL
- $12.5
- Cache write, 1h TTL
- $20
- Batch discount
- 50%
Price history
See full Claude Mythos 5.1 price historyNo Claude Mythos 5.1 price changes have been recorded yet.
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Frequently asked questions
Short answers to the most common questions about Claude Mythos 5.1 pricing, limits, and capabilities.
Notes
ADDED 2026-10-08, read directly from platform.claude.com/docs/en/about-claude/pricing. STANDARD: input $10 / output $50 / cache write 5m $12.50 / cache write 1h $20 / cache read $0.25 per MTok. Batch halves input and output to $5 / $25. US regional endpoint 1.1x. IDENTICAL PRICING TO CLAUDE FABLE 5.1 on every field. The Mythos line is Anthropic's top capability tier; Mythos Preview is referenced elsewhere on the page as carrying a 1M context window at standard pricing. Mythos 5 is the earlier version and differs ONLY in cache read ($1 against $0.25 here). Context Window and Max Output Tokens left EMPTY — not stated for this model in the pricing table. Fill from the model overview page rather than assuming.