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Claude Fable 5

Reasoning modelClaude Mythos

Claude Fable 5

Release date: 2026-06-09Updated: 2026-07-17 21:57:22.076Knowledge cutoff: 2026-018,788
Live demoGitHubHugging FaceCompare
Parameters
Not disclosed
Context length
1M
Chinese support
Supported
Reasoning ability

Claude Fable 5 is a reasoning model from Anthropic, released on 2026-06-09. It accepts text and image input and returns text output. The recorded context window is 1M, and the recorded maximum output is 128K. Cataloged capabilities include Reasoning model and Multilingual. The model weights are proprietary and are not published for download. Use the linked references to confirm current access, licensing, and provider-specific limits.

Data sourced primarily from official releases (GitHub, Hugging Face, papers), then benchmark leaderboards, then third-party evaluators. Learn about our data methodology

Claude Fable 5

Model basics

Reasoning traces
Supported
Thinking modes
Thinking Level · Adaptive Thinking (Default)
Context length
1M tokens
Max output length
128K tokens
Model type
Reasoning model
Modality (in / out)
Text, Image → Text
Release date
2026-06-09
Model file size
No data
MoE architecture
No
Total params / Active params
No data / N/A
Knowledge cutoff
2026-01
Claude Fable 5

Open source & experience

Code license
Proprietary
Weights license
Proprietary
GitHub repo
GitHub link unavailable
Hugging Face
Hugging Face link unavailable
Claude Fable 5

Official resources

Paper
DataLearnerAI blog
No blog post yet
Claude Fable 5

API details

API speed
3/5
💡Default unit: $/1M tokens. If vendors use other units, follow their published pricing.
Standard
TypeConditionInputOutput
Text-$10.00/ 1M$50.00/ 1M
Batch
TypeConditionInputOutput
Text-$5.00/ 1M$25.00/ 1M
Cache PricingPrompt Cache
TypeTTLWriteRead
Text5m$12.50/ 1M$1.00/ 1M
Text1h$20.00/ 1M-
Claude Fable 5

Benchmark Results

Claude Fable 5 currently shows benchmark results led by Simple Bench (1 / 63, score 81.90), SWE-bench Verified (2 / 112, score 95), SWE-Bench Pro - Public (1 / 54, score 80.30). This page also consolidates core specs, context limits, and API pricing so you can evaluate the model from benchmark results and deployment constraints together.

Thinking
Tool usage

General Knowledge

3 evaluations
Benchmark / mode
Score
Rank/total
75.47
12 / 115
78.31
5 / 115
HLE
Deep
59
4 / 172

Coding and Software Engineer

4 evaluations
Benchmark / mode
Score
Rank/total
95
2 / 112
95
2 / 112
80.30
1 / 54
DeepSWE
DeepTools
70
2 / 19

Common Sense Reasoning

1 evaluations
Benchmark / mode
Score
Rank/total
Simple Bench
Standard Mode
81.90
1 / 63

AI Agent - Tool Usage

4 evaluations
Benchmark / mode
Score
Rank/total
88
3 / 27
88
3 / 27
85
1 / 24
MCP-Atlas
Standard ModeTools
83.30
4 / 27

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Claude Fable 5

Publisher

Claude Fable 5

Model Overview

Claude Fable 5 is a reasoning model from Anthropic, released on 2026-06-09.

It accepts text and image input and produces text output. Its cataloged capabilities include Reasoning model and Multilingual. The recorded context window is 1M, and the recorded maximum output is 128K.

The model weights are proprietary and are not published for download. The page records 11 API pricing rules from Anthropic; current provider pricing and conditions should be checked before deployment. The evaluation section contains 12 cataloged benchmark results with their recorded modes and scores. The page links 2 release, model-card, repository, or provider references for checking the underlying claims. Specifications, availability, and prices can change; undisclosed values are intentionally left unstated.

Claude Fable 5

FAQ

What is Claude Fable 5?

Claude Fable 5 is a reasoning model from Anthropic, released on 2026-06-09. It accepts text and image input and returns text output. The recorded context window is 1M, and the recorded maximum output is 128K. Cataloged capabilities include Reasoning model and Multilingual. The model weights are proprietary and are not published for download. Use the linked references to confirm current access, licensing, and provider-specific limits.

What input and output modalities does Claude Fable 5 support?

The current model record lists text and image as input and text as output.

What are the main recorded specifications for Claude Fable 5?

The recorded context window is 1M, and the recorded maximum output is 128K. Fields without a source-backed value remain undisclosed.

Does Claude Fable 5 have API pricing?

The page records 11 API pricing rules from Anthropic; current provider pricing and conditions should be checked before deployment.

Are benchmark results available for Claude Fable 5?

The evaluation section contains 12 cataloged benchmark results with their recorded modes and scores. Compare only results that use the same benchmark version and evaluation mode.

Is Claude Fable 5 open source?

The model weights are proprietary and are not published for download. Review the linked license text before commercial or derivative use.

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