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Anthropic: Claude Fable 5.1

Claude model for demanding reasoning and long-horizon agentic work

Source-linked claude-fable Closed weights Released 2026-09-01
API record Report
InputT
OutputT
Input price$10/M
Output price$50/M
Context1M
Max output128K
Providers25
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

Report a price
Providers offering Claude Fable 5.1
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
Vivgrid claude-fable-5-1 1M 128K $10 $50 $0.5 ReasoningToolsJSON Docs ↗
Cloudflare AI Gateway anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
GitHub Copilot claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
302.AI claude-fable-5-1 1M 128K $10 $50 ReasoningTools Docs ↗
Neon claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Vertex (Anthropic) claude-fable-5-1@default 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Ofox anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Azure Cognitive Services claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Vercel AI Gateway anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Kilo Gateway anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Vertex claude-fable-5-1@default 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Anthropic claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Amazon Bedrock anthropic.claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Eden AI anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Eden AI anthropic/claude-fable-latest 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Azure claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
OpenRouter anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Merge Gateway anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
OpenCode Zen claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Requesty claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
CrossModel anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
NanoGPT anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
LLM Gateway anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
DevPass (LLM Gateway) claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Venice AI claude-fable-5-1 1M 128K $12 $60 $0.3 ReasoningToolsJSON Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $10/M

Across 25 priced providers

Median input $10/M

Midpoint of listed rates

Highest input $12/M

1.2× the lowest listed rate

Output range $50 – $60

Per million output tokens

Vivgrid $10/M
Cloudflare AI Gateway $10/M
GitHub Copilot $10/M
302.AI $10/M
Neon $10/M
Vertex (Anthropic) $10/M
Ofox $10/M
Azure Cognitive Services $10/M
Vercel AI Gateway $10/M
Kilo Gateway $10/M
Vertex $10/M
Anthropic $10/M
Amazon Bedrock $10/M
Eden AI $10/M
Eden AI $10/M
Azure $10/M
OpenRouter $10/M
Merge Gateway $10/M
OpenCode Zen $10/M
Requesty $10/M
CrossModel $10/M
NanoGPT $10/M
LLM Gateway $10/M
DevPass (LLM Gateway) $10/M
Venice AI $12/M
Cost calculator

Estimate a workload

$0.00
Excludes taxes, non-token charges, and tiered discounts.

24 providers list the identical $10 input rate, so price alone will not separate them — compare context limits, max output, and capabilities above.

Specification

Capabilities

Recorded from the source catalog and provider listings.

Reasoning Yes
Tool calling Yes
Structured output Yes
Attachments Yes
Vision input Yes
× Open weights No
Creator
Anthropic
Model family
claude-fable
Knowledge cutoff
2026-06
License
Not documented
Release date
2026-09-01
Model ID
anthropic/claude-fable-5-1
Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
No published benchmark results

ModelBench does not infer quality from price, context size, or model name. When a source publishes a comparable result, it appears here with its version and link.

Read the methodology
Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
No changes recorded

This record has not changed within the retained import history.

Provenance

Sources & verification

Every figure on this page traces back to one of these records.

Methodology
Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://model.kyssta.lol/api/v1/models/anthropic/claude-fable-5-1
curl
curl "https://model.kyssta.lol/api/v1/models/anthropic/claude-fable-5-1"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is Claude Fable 5.1?

Claude model for demanding reasoning and long-horizon agentic work. It is published by Anthropic and catalogued here from Models.dev.

How much does Claude Fable 5.1 cost?

Listed input pricing starts at $10 per million tokens from Vivgrid, rising to $12 across 25 listed providers.

What is the context length of Claude Fable 5.1?

Claude Fable 5.1 accepts up to 1M tokens of context and returns up to 128K output tokens.

Does Claude Fable 5.1 support tool calling and structured output?

Provider catalogs list support for tool calling, structured output, reasoning, and image input.

Which providers serve Claude Fable 5.1?

24 providers list this model: Vivgrid, Cloudflare AI Gateway, GitHub Copilot, 302.AI, Neon, Vertex (Anthropic) and 18 more.

Are the weights for Claude Fable 5.1 open?

No. This model is served through hosted APIs only.

When was Claude Fable 5.1 released?

The catalog records a release date of 2026-09-01, last verified Sep 12, 2026.

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