Claude Mythos
Fable's capabilities for verified organizations, behind Anthropic's verification program.
Claude Mythos is Fable's twin: the same capabilities, context window and pricing, offered only to organizations that pass Anthropic's Cyber Verification Program. It exists so high-assurance organizations can run the top of the lineup under their own clearance; everyone else uses Fable.
What it is good at
- Fable 5.1's specifications and pricing under an organizational verification gate
What it is less good at
- Limited availability — Anthropic's Cyber Verification Program, not a self-serve model
- No TeamCLI route: Claude Code's model screen lists Opus, Sonnet, Haiku and Fable only
Reaching it with TeamCLI
TeamCLI cannot reach Claude Mythos yet — no verified or listed route carries it. It is listed because Anthropic offers it today.
Versions
One block per version, the current one first, each with its own anchor. The comparison table puts the costs and the family's benchmark columns side by side; the values are verbatim, and every one is sourced and dated in its version's section below and in the Sources list. A dash means the source publishes no figure, and nothing here is estimated.
No independent intelligence or speed index is republished here: Artificial Analysis measures both across labs, and its terms allow the link but not the copy — its figures live on its own pages.
| Version | Released | Context | Input price | Output price |
|---|---|---|---|---|
| Claude Mythos 5.1 — current | — | 1M tokens | $10 / MTok | $50 / MTok |
| Claude Mythos 5 | — | — | $10 / MTok | $50 / MTok |
Claude Mythos 5.1 — current
- Model id: —
Abilities
- Released: —
- Context window: 1M tokens — Anthropic — Claude Fable 5.1 model page (read 2026-10-19). Shares Fable 5.1's specifications
- Max output: 128K tokens — Anthropic — Claude Fable 5.1 model page (read 2026-10-19).
- Output speed: —
- Latency: —
Costs
- Input price: $10 / MTok — Anthropic — pricing (read 2026-10-19). Limited availability; Fable 5.1's specs and pricing
- Output price: $50 / MTok — Anthropic — pricing (read 2026-10-19).
Claude Mythos 5
- Model id: —
Abilities
- Released: —
- Context window: —
- Max output: —
- Output speed: —
- Latency: —
Costs
- Input price: $10 / MTok — Anthropic — pricing (read 2026-10-19). Limited availability
- Output price: $50 / MTok — Anthropic — pricing (read 2026-10-19).
Sources
- Anthropic — Claude Fable 5.1 model page — read 2026-10-19
- Anthropic — pricing — read 2026-10-19
Figures refreshed 2026-10-19; benchmarks are vendor-reported. Prices are per million tokens unless a figure says otherwise.