Anthropic
Claude Fable 5.1 (XHigh)
Claude Fable 5.1 running at xhigh reasoning effort.
Intelligence
89.0 #3
Top 1% tier
Output Speed
78 t/s
TTFT 350 ms · ITL 12.8 ms/tok
Blended price (3:1)
$6 /1M
In $3/M · Out $15/M
Context
500K
≈ 1,250 A4 pages · max out 32,768
Quality Domain Radar
6-Axis Frontier Evaluation vs Category Average & Flagship
Claude Fable 5.1 (XHigh)
Claude Mythos Preview (#1)
Average (68)
Radar axes are approximated from category scores where direct benchmark measurements are missing — see Methodology.
API deployment
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Throughput, TTFT and cache pricing across Groq, Cerebras, Together, DeepInfra, Fireworks, Bedrock and Azure.
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Category Scores
Benchmark Results
Model Details
Release date
Aug 15, 2026
Parameters
Not disclosed
License
Proprietary
Context Window
500,000 tokens
Input Price
$3/M
Output Price
$15/M
Output Speed
78 t/s
Time to First Token
350 ms
Estimated monthly bill
Estimated monthly spend
$0.00
Calculating savings vs GPT-4o...
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@misc{llmpodium2026claudefable51xhigh,
title = {Benchmark Analysis and Intelligence Evaluation of Claude Fable 5.1 (XHigh)},
author = {LLMPodium Research},
year = {2026},
url = {https://llmpodium.com/models/claude-fable-5-1-xhigh}
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