Claude Fable 5.1

Name: Claude Fable 5.1
Price: 10 USD
Author: Anthropic

Claude Fablev5.1Current

Anthropic(ai lab)

Released September 1, 2026

API Docs Playground

OpenTools Scorenormalized /100

3.3

Valuescore / $M

OpenTools Score

Context1M tokens

Price (In / Out)$10.00/M / $50.00/M

Training Cutoff2026-06

CategoryLarge Language Model

Max Output128K tokens

About Claude Fable 5.1

Claude Fable 5.1 is Anthropic's model for demanding reasoning and long-horizon agentic work. It supports text and image input, text output, a 1M-token context window and always-on adaptive thinking. Anthropic recommends Claude Opus 5 for most workloads and Fable 5.1 when higher-effort Opus evaluations fall short.

Capabilities

textvisionreasoningcodingtool useagentslong contextadaptive thinking

Input Modalities

textimage

Output Modalities

text

Technical Details

API Identifier: claude-fable-5-1
Category: Large Language Model
Context Window: 1,000,000 tokens
Max Output Tokens: 128,000 tokens

Benchmarks

Performance scores for Claude Fable 5.1 across standard benchmarks.

Artificial Analysis Intelligence Index v4.3Artificial Analysis

53.4 index

GPQA DiamondArtificial Analysis

93.7%

SciCodeArtificial Analysis

63.1%

Terminal-Bench 2.1Artificial Analysis

91.4%

Pricing

Token pricing for Claude Fable 5.1 API usage.

Input Tokens

$10.00/M

per million tokens

Output Tokens

$50.00/M

per million tokens

Pricing Calculator

Input tokens/month

Output tokens/month

Input cost$10.00

Output cost$25.00

Estimated monthly cost$35.00

Anthropic lists $10 per million input tokens and $50 per million output tokens. Cache reads cost $0.25 per million tokens, 5-minute cache writes cost $12.50, 1-hour cache writes cost $20, and Batch API input/output receives a 50% discount.

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Building reliable, interpretable, and steerable AI systems

8 Tools3 MCP Servers7 ModelsFounded 2021San Francisco, CA

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Claude Opus 5Current	1.0M	$5.00 / $25.00	textvisionreasoningcoding+3
Claude Sonnet 5Current	1.0M	$2.00 / $10.00	textvisionreasoningcoding+3
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Claude Sonnet 4.6Current	1.0M	$3.00 / $15.00	textvisioncodetool use
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