AI Model Profile
Claude Fable 5.1
Claude Fable 5.1 is an Anthropic API model with a 1M-token context and 128K maximum output. It accepts text and images and generates text. The cited documentation lists hosted API and cloud routes; it does not list an official local or open-weight release.
- Family
- Claude
- Release date
- 2026-09-01
- Status
- Current
- Context window
- 1000000
- Output limit
- 128000
- API
- yes
- Open weights
- Unknown
- Local/self-hosted
- Unknown
- Pricing
- Standard USD per million tokens: input $10; output $50; 5-minute cache write $12.5; 1-hour cache write $20; cache read $0.25.
- Evidence state
- Source-verified
Benchmark Caveat
Provider capability descriptions are not independent performance measurements. Existing historical tests on other versions do not apply to this exact model.
No Kingy benchmark was run for this source-only profile.
Agent suitability
Tool use is supported. Forced tool choice is unsupported. Fable 5.1 is distinct from Mythos 5.1, whose access is restricted to organizations verified through Anthropic verification programs.
Kingy AI Product Facts
Claude Fable 5.1
Current statusUnknown
- Company
- Anthropic
- Primary job
- Not yet reviewed
- Audience
- Not yet reviewed
- Evidence
- Source-backed; coverage expanding
- Latest source check
- October 19, 2026
See all tracked product factsPricing, platforms, dependencies, data claims, regions, and timeline
Sources and checks
- Coverage
- 4 of 88 tracked fields currently verified
- Sources
- 1
Source-check dates apply to the tracked facts. Editorial updates elsewhere on this page may have a different date.
Plans and pricing units
Not yet structured in this Kingy record.
Where it runs
- Availability
- Not yet reviewed
Stack and integrations
- Model / provider dependencies
- Not yet reviewed
- Integrations
- Not yet reviewed
Data and regions
- Vendor data-use claim
- Not yet reviewed
- Vendor retention claim
- Not yet reviewed
- Regions
- Not yet reviewed
Launch and latest material update
- Launch
- Not yet reviewed
- Latest material update
- Not yet reviewed
Reasoning notes
Adaptive thinking is always enabled; default effort is high. Forced tool_choice any or tool is unsupported.
API pricing notes
Batch offers a 50% input/output discount. Standard context pricing and platform-specific restrictions must be checked on the linked official model page. No paid request or invoice was tested.
Official Model Links
Kingy coverage
Kingy AI articles that cover Claude Fable 5.1, newest first.
- BlogClaude Opus 5.5 vs Fable 5.1: Is Fable Still Worth the Premium?
- BlogClaude Opus 5.5: Specs, Benchmarks, Pricing and How It Stacks Up Against GPT-6 Astra, Fable 5.1 and Every Frontier Model
- BlogAstra vs Claude Fable 5.1: Same $10/$50 Price—Which Model Finishes Real Work Cheaper?
- NewsAnthropic Launches Claude Fable 5.1, Betting on Smarter Coding, Longer AI Workflows, and Much Cheaper Agents
- BlogBest AI Coding Model in 2026? Fable 5.1 vs the Frontier
- BlogClaude Fable 5.1: Benchmarks, Price, Mythos Access and Verdict
- BlogCan Claude Fable 5.1 and Mythos 5.1 Do Real Science?
- BlogClaude Fable 5.1 vs Mythos 5.1: What Actually Changes?
Model Intelligence Research Map
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