Today's price · per 1M tokens
Input
$10.00
per 1M tokens
Output
$50.00
per 1M tokens
Blended
$20.00
blended $/1M — 3:1 weighted input:output
Cached input
$0.250
3% of input — prompt caching
How this price is scoped: Cache hits and refreshes on Claude Fable 5.1 (and Claude Mythos 5.1) are priced at 0.025x the base input price — $0.25 per 1M tokens — where every other Claude model uses the standard 0.1x multiplier. Base $10/$50 per 1M tokens; Batch API $5/$25. Verified 2026-09-01 against platform.claude.com/docs/en/about-claude/pricing.
Price receipt
We read Anthropic's own pricing page on and found Claude Fable 5.1 listed with a price on the same row — that read is where the number above comes from, recorded as a new model. We keep the page text we read; its content hash is e3310d2553.
Overview
Anthropic's newest Mythos-class flagship for demanding reasoning and long-horizon agentic work — adaptive always-on thinking, vision, and tool use, with a 1M-token context window and up to 128K output tokens. $10/$50 per 1M tokens, with the deepest caching discount in the lineup: cache hits cost $0.25 per 1M tokens (0.025x input, vs the standard 0.1x).
Capabilities
struck through = not supportedBenchmark performance
accuracy % · higher is better- AA Intelligence Index: 53.4 (Artificial Analysis composite across reasoning, knowledge and coding evals)
- AA-Omniscience Index: 43.5 (−100–100)
- GDPval-AA v2: 1763.6 ELO (Real-world work tasks, human baseline = 1000)
- LMSYS Chatbot Arena: 1498.5 ELO (Human preference)
- Ranks #4 of 100 benchmarked models by average score
- Ranks #5 of 195 comparably-measured models by percentile score, across 9 independent measurements
- Ranks #182 of 195 comparably-tested models by normalized performance per dollar
- Strongest at Terminal-Bench 2.1 — 91.4%, #1 of 48
65 tokens/sec output
Source: Vellum LLM Leaderboard · updated · See full rankings →
Specifications
- Provider
- Anthropic
- Context window
- 1M tokens
- Modality
- text, image
- Parameters
- Proprietary
- Open source
- No — proprietary
- Released
- Status
- Current
- Last updated
- Tags
Availability verified: — listed on Anthropic's own page