Anthropic

Claude Fable 5.1

Anthropic's most capable generally available Claude for demanding reasoning and long-horizon agentic work, with a 1M-token context window, always-on adaptive thinking, and effort control.

ActiveReleased September 1, 2026Knowledge cutoff June 30, 2026
Tool callingCan invoke external tools and APIs (function calling) mid-response.Structured outputCan return JSON or schema-constrained responses instead of free text.ReasoningUses extended thinking / chain-of-thought for harder multi-step problems.Effort controlLets you dial thinking depth (low / medium / high) to trade cost for quality.Fine-tuningSupports training a custom variant on your own data (vendor fine-tune API or self-hosted open weights).

Source: Anthropic pricing, Claude models overview, Prompt caching (minimums, 5m/1h TTL), Claude Fable 5.1 announcement, Claude Platform release notes

Price per 1M tokens
$10 in / $50 out
Context window1,000,000
Max output128,000
Cache read$0.25 / M
Min cache prefix512 tokens
Cache lifetime5 min
Batch discount-50%
ModalitiesText, Image → Text

Pricing

Every billing leg from the live catalog, in USD per 1M tokens.

Billing legRateBatch
Input$10 / M$5 / M
Output$50 / M$25 / M
Cache read$0.25 / M$0.125 / M
Cache write · 5 min$12.5 / M$6.25 / M
Cache write · 1 hour$20 / M$10 / M

Cost calculator

Billing-grade math over the rate card above, including the thinking tokens most estimates miss.

Hidden reasoning tokens bill as output. 1.0x = thinking off. Medium-effort reasoning typically lands near 3x; heavy reasoning runs 6x to 8x. Set it to match your workload.

Estimated monthly cost
$5.0K
at current list prices
Fresh input$2.0K
Cached input$0.00
Output incl. thinking$3.0K
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Provider

Where this model runs, and what it charges.

PlatformInput / MOutput / MCache read / MBatchAccess
Anthropic
$10$50$0.25✓First-party API

Price history

Has this model gotten cheaper or more expensive?

No changePriced at $10 / $50 per 1M since September 1, 2026.

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Rates are generated from SuperPenguin's live pricing catalog.