Claude Fable 5.1: Release Intelligence, Performance & Price
Available providers
Model summary
Verbosity
The Claude Fable 5.1 release offers 5 models, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across the 5 models.
- For intelligence, the top model of Claude Fable 5.1 is Claude Fable 5.1 (Max, Default Fallback) at 53.
- For output speed, the fastest model is Claude Fable 5.1 (Max, Default Fallback) at 65 t/s.
- For latency, Claude Fable 5.1 (Low, Default Fallback) at 2.37s offers the lowest time to first answer token.
- For pricing, Claude Fable 5.1 (Low, Default Fallback) at $2.37 offers the lowest cost per task. Prices vary up to 3.2x across models.
| Reasoning | Yes This page shows the reasoning version of this model. A non-reasoning variant may also exist. |
|---|---|
| Input modality | Supports: text and image |
| Output modality | Supports: text |
| Context window | 1M ~1500 A4 pages of size 12 Arial font |
Metrics are compared against models of the same class:
- Non-reasoning models → compared only with other non-reasoning models
- Reasoning models → compared across both reasoning and non-reasoning
- Open weights models → compared only with other open weights models of the same size class:
- Tiny: ≤4B parameters
- Small: 4B–40B parameters
- Medium: 40B–150B parameters
- Large: >150B parameters
- Proprietary models → compared across proprietary and open weights models of the same price range, using a blended 3:1 input/output price ratio:
- <$0.15 per 1M tokens
- $0.15–$1 per 1M tokens
- >$1 per 1M tokens
Intelligence
Artificial Analysis Intelligence Index
Intelligence Index vs. Cost per Intelligence Index Task
Cost
Cost per Intelligence Index Task
Speed & Latency
Output Speed
Capability Scores
Capability Indexes
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 6 evaluations: GDPval-AA v2.1, AA-Briefcase v1.1, AA-Omniscience, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better
Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AA-LCR v1.1, GDP.pdf, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, MLCR-AA, Humanity's Last Exam, AutomationBench-AA · Higher is better
Incorporates 6 evaluations: AA-Omniscience, Humanity's Last Exam, CritPt, GDPval-AA v2.1, AA-Briefcase v1.1, Terminal-Bench 4.0 · Higher is better
Incorporates 5 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2.1, AA-Briefcase v1.1, AA-LCR v1.1 · Higher is better
Intelligence Evaluations
Agentic knowledge work, (Elo-500)/2000
Agentic real-world work tasks, (Elo-500)/2000
Agentic SaaS workflows
Agentic coding & terminal use
Coding
Reasoning & knowledge
Professional document reasoning, All-pass
Physics reasoning
Knowledge
1 - hallucination rate
Long context reasoning
Legal agentic work, Hallucination-Gated All-Pass Rate
Agentic scientific research workflows in a terminal
Quantitative analysis on spreadsheets & documents
Kubernetes incident root-cause analysis
Medical long context reasoning
More from Anthropic
Further details
Weights | Provider Benchmarks | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Claude Fable 5.1 (Max, Default Fallback) |  Anthropic | 53 | - | 1M | $7.2 | 65 | Not available | | |
| Claude Fable 5.1 (Xhigh, Default Fallback) | Anthropic | 53 | - | 1M | $7.2 | 62 | Not available | | |
| Claude Fable 5.1 (High, Default Fallback) | Anthropic | 51 | - | 1M | $7.2 | 58 | Not available | | |
| Claude Fable 5.1 (Medium, Default Fallback) | Anthropic | 49 | - | 1M | $7.2 | 57 | Not available | | |
| Claude Fable 5.1 (Low, Default Fallback) | Anthropic | 47 | - | 1M | $7.2 | 58 | Not available | |