Anthropic logo

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
Providers37
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
NanoGPT 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 ↗
OpenRouter anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Vertex (Anthropic) 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 ReasoningToolsJSON Docs ↗
LLM Gateway 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 ↗
Azure Cognitive Services claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
OpenCode claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Azure 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 ↗
DevPass (LLM Gateway) claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Venice AI claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
CrossModel anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON 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 ↗
Kilo Gateway anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Requesty claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Ofox anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningTools 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 ReasoningToolsJSON Docs ↗
Neon claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Vivgrid claude-fable-5-1 1M 128K $10 $50 $0.5 ReasoningToolsJSON Docs ↗
302.AI claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Tempr Gateway anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
Opper claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
ZenMux anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
NEAR AI Cloud anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Prime Inference anthropic/claude-fable-5.1 1M 128K $10 $50 — ReasoningToolsJSON Docs ↗
AI/ML API anthropic/claude-fable-5.1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Boundless claude-fable-5.1 262.144K 128K $10 $50 $0.25 ReasoningTools Docs ↗
Aixy anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
CommandCode claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningTools Docs ↗
Standard Compute anthropic/claude-fable-5.1 1M 50K $10 $50 $0.25 ReasoningTools Docs ↗
Perplexity Agent anthropic/claude-fable-5-1 1M 128K $10 $50 $0.25 ReasoningToolsJSON Docs ↗
AIHubMix claude-fable-5-1 1M 128K $11 $55 $0.275 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 37 priced providers

Median input $10/M

Midpoint of listed rates

Highest input $11/M

1.1× the lowest listed rate

Output range $50 – $55

Per million output tokens

NanoGPT $10/M
Vertex $10/M
OpenRouter $10/M
Vertex (Anthropic) $10/M
Anthropic $10/M
Amazon Bedrock $10/M
LLM Gateway $10/M
Merge Gateway $10/M
Azure Cognitive Services $10/M
OpenCode $10/M
Azure $10/M
Vercel AI Gateway $10/M
DevPass (LLM Gateway) $10/M
Venice AI $10/M
CrossModel $10/M
Eden AI $10/M
Eden AI $10/M
Kilo Gateway $10/M
Requesty $10/M
Ofox $10/M
Cloudflare AI Gateway $10/M
GitHub Copilot $10/M
Neon $10/M
Vivgrid $10/M
302.AI $10/M
Tempr Gateway $10/M
Opper $10/M
ZenMux $10/M
NEAR AI Cloud $10/M
Prime Inference $10/M
AI/ML API $10/M
Boundless $10/M
Aixy $10/M
CommandCode $10/M
Standard Compute $10/M
Perplexity Agent $10/M
AIHubMix $11/M
Cost calculator

Estimate a workload

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

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

Context limits also differ by provider, from 262.144K to 1M tokens. Compare the provider table above before choosing on price alone.

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
Benchmark profile
Humanity's Last…Humanity's Last Exam Terminal-BenchTerminal-Bench 4.0 GDPval-AAGDPval-AA 2 This model — Humanity's Last Exam: 65 score (87.5th percentile) This model — Terminal-Bench 4.0: 55.8 score (72.2th percentile) This model — GDPval-AA 2: 1853 Elo (91.7th percentile)

Each axis is this model's percentile among the 3 benchmarks it has published results for, measured against every other model with a score on that same benchmark. Percentiles are used because benchmarks do not share a scale — a 60 on one is not a 60 on another. Hover any point for the raw score.

Humanity's Last Exam score · 2026-09-01 Source ↗
Humanity's Last Exam #2 of 12
Terminal-Bench — 4.0 score · 2026-09-01 Source ↗
Terminal-Bench #3 of 9
GDPval-AA — 2 Elo · 2026-09-01 Source ↗
GDPval-AA #1 of 6
AutomationBench pass rate · 2026-09-01 Source ↗
31.4 2 models scored — too few for a distribution
Terminal-Bench-Science — 0.1 score · 2026-09-01 Source ↗
52.6 2 models scored — too few for a distribution
CursorBench — 3.2.0 score · 2026-09-01 Source ↗
73.4 1 model scored — too few for a distribution
OSWorld — 2.0 strict success rate · 2026-09-01 Source ↗
41.7 1 model scored — too few for a distribution

Each strip shows every published score for that benchmark, with this model marked. The lighter shape behind the ticks is the density of results, and the dashed line is the median.

Cost against capability

Price and performance

Listed input price plotted against Humanity's Last Exam, the benchmark with the widest published coverage that this model appears in.

0 36 72 $0.1 $1 $10 Qwen3.8 27B — $0.04/M, score 30.8 Qwen3.8 Flash Next — $0.1/M, score 35.9 Qwen3.8 Max — $2/M, score 43.6 Claude Fable 5.1 — $10/M, score 65.0 Claude Haiku 5.5 — $0.1/M, score 57.4 Claude Opus 5.5 — $4/M, score 67.7 Claude Sonnet 5.5 — $2/M, score 64.5 DeepSeek V4 Pro 0813 — $0.132/M, score 60.0 DeepSeek V4.1 Flash 1017 — $0.15/M, score 44.0 Muse Spark Open — $1.25/M, score 61.0 Beam 1.0 501B A23B — $0.24/M, score 51.1 Hy3 — $0.066/M, score 37.0 Claude Fable 5.1 Input price per million tokens (log scale) Score

The stepped line is the efficient frontier: at each price, the best score available for that money or less. A model sitting on it is not being beaten by anything cheaper. Price is log-scaled because listed rates span four orders of magnitude. Only models with both a listed price and a score on this benchmark can appear.

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://modelbench.lol/api/v1/models/anthropic/claude-fable-5-1
curl
curl "https://modelbench.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 NanoGPT, rising to $11 across 37 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?

36 providers list this model: NanoGPT, Vertex, OpenRouter, Vertex (Anthropic), Anthropic, Amazon Bedrock and 30 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 Oct 24, 2026.

More models from Anthropic

View all →