Claude Fable 5.1 vs JT-4.1 Flash 236B A21B: Release Comparison

Name: Intelligence
Creator: Artificial Analysis
License: https://artificialanalysis.ai/docs/legal/Terms-of-Use.pdf

Comparison of the Claude Fable 5.1 and JT-4.1 Flash 236B A21B releases: 5 and 2 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 7 models.

Model Playground

Releases compared


	Claude Fable 5.1 (xhigh)	Claude Fable 5.1 (max)	Claude Fable 5.1 (high)	Claude Fable 5.1 (medium)	Claude Fable 5.1 (low)	JT-4.1 Flash 236B A21B	JT-4.1 Flash 236B A21B (non-reasoning)
Intelligence Index	50	49	47	43	39	--	--
Finance & Accounting	54	54	50	47	48	--	--
Strategy & Ops	56	58	54	52	51	--	--
Legal	54	54	50	48	47	--	--
Healthcare & Medical	51	51	48	45	44	--	--
Engineering	57	57	54	50	46	--	--
Economics	56	57	52	50	48	--	--
AA-Briefcase v1.1	1649	1669	1577	1525	1478	1092	--
AutomationBench-AA	57.8%	59.4%	55.3%	54.7%	52.2%	46.5%	--
Terminal-Bench 4.0	55.1%	52.0%	52.0%	44.9%	40.4%	3.0%	--
FrontierCode 2.0	35.7%	31.6%	30.3%	28.8%	22.8%	--	--
AA-Omniscience v1.1	44	46	40	36	34	--	--
GDP.pdf	26.2%	26.2%	26.8%	26.8%	28.0%	8.6%	--
HLE-Diamond	58.8%	60.1%	50.4%	45.0%	37.4%	--	--
CritPt v2 (Hard Subset)	60.0%	52.5%	62.0%	58.5%	49.5%	--	--
Terminal-Bench-Science 0.1	40.5%	43.3%	39.5%	29.0%	21.4%	--	--

Cost per TaskUSD	$10.85	$12.99	$7.54	$5.56	$4.47	--	--
Input PriceUSD/1M Tokens	$10.00	$10.00	$10.00	$10.00	$10.00	--	--
Output PriceUSD/1M Tokens	$50.00	$50.00	$50.00	$50.00	$50.00	--	--
Cache Hit PriceUSD/1M Tokens	$0.25	$0.25	$0.25	$0.25	$0.25	--	--
Cache Write PriceUSD/1M Tokens	$12.50	$12.50	$12.50	$12.50	$12.50	--	--

Time per TaskMinutes	19.1	22.7	13.2	9.7	7.4	--	--
Output Speedtok/s	85	86	83	84	85	--	--
Time to First Answer Tokens	66.43	185.18	14.39	10.31	6.86	--	--
Time to First Tokens	66.43	185.18	14.39	10.31	6.86	--	--
End-to-End TimeMean of Single-Request Workloads (s)	201.06	430.11	84.56	76.72	60.22	--	--

Context Window	1M	1M	1M	1M	1M	262k	262k
Creator	Anthropic	Anthropic	Anthropic	Anthropic	Anthropic	China Mobile	China Mobile
License	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary
Input Modality	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image
Output Modality	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text
Providers						--	--

Updated

Intelligence

Artificial Analysis Intelligence Index · Higher is better

Time per Task

Inference time (minutes) per Intelligence Index task · Lower is better

Cost per Task

Weighted average cost (USD) per Intelligence Index task · Lower is better

IntelligenceUpdated

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v5.0.1 incorporates 9 evaluations: AA-Briefcase v1.1, AutomationBench-AA, Terminal-Bench 4.0, FrontierCode 2.0, AA-Omniscience v1.1, GDP.pdf, HLE-Diamond, CritPt v2 (Hard Subset), and Terminal-Bench-Science 0.1

No publicly available API

Artificial Analysis Intelligence Index v5.0.1 includes: AA-Briefcase v1.1, AutomationBench-AA, Terminal-Bench 4.0, FrontierCode 2.0, AA-Omniscience v1.1, GDP.pdf, HLE-Diamond, CritPt v2 (Hard Subset), Terminal-Bench-Science 0.1. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Intelligence Index vs. Cost per Task

Artificial Analysis Intelligence Index · Weighted average cost (USD) per Artificial Analysis Intelligence Index task

Most attractive quadrant

Claude Fable 5.1

Pareto line

AA-Briefcase v1.1

AutomationBench-AA

Cost per Task (USD, Log Scale)

Weighted average cost per Intelligence Index task. Each evaluation’s cost is calculated from input, cache hit, cache write, reasoning, and answer token prices, divided by task count, and weighted by its Intelligence Index weight.

Cost

Cost per Intelligence Index Task

Weighted average cost (USD) per Intelligence Index task · Segmented by token type · Lower is better

No publicly available API

Speed & Latency

Time per Intelligence Index Task

Output tokens divided by end-to-end output speed (minutes per Intelligence Index task) · Speed at the model's own endpoint or the median across providers · Lower is better

No publicly available API

The weighted average time (minutes) per Artificial Analysis Intelligence Index task: output tokens per task divided by output speed, weighted by each benchmark's weight in the Intelligence Index.

Speed and latency metrics average each endpoint's runs over the past 5 days, and the error rate pools them. We run the benchmark every 6 hours, and endpoints of deprecated models every 18 hours.

Capability Scores

Capability Indexes

Measures the performance of models on specific capabilities and industries

Finance & Accounting Index

Incorporates 5 evaluations: AA-Briefcase v1.1, AA-Omniscience v1.1, HLE-Diamond, AutomationBench-AA, GDP.pdf · Higher is better

Strategy & Ops Index

Incorporates 4 evaluations: AutomationBench-AA, AA-Briefcase v1.1, AA-Omniscience v1.1, GDP.pdf · Higher is better

Legal Index

Incorporates 5 evaluations: AA-Omniscience v1.1, AA-Briefcase v1.1, HLE-Diamond, GDP.pdf, AutomationBench-AA · Higher is better

Healthcare & Medical Index

Incorporates 5 evaluations: AA-Omniscience v1.1, AA-Briefcase v1.1, MLCR-AA, AutomationBench-AA, HLE-Diamond · Higher is better

Engineering Index

Incorporates 7 evaluations: AA-Omniscience v1.1, CritPt v2 (Hard Subset), Terminal-Bench-Science 0.1, HLE-Diamond, Terminal-Bench 4.0, FrontierCode 2.0, AA-Briefcase v1.1 · Higher is better

Economics Index

Incorporates 4 evaluations: AA-Omniscience v1.1, AA-Briefcase v1.1, HLE-Diamond, GDP.pdf · Higher is better

Benchmarks

AA-PersonalityBenchNew

Personality Indexes

Each axis is one of 8 personality indexes: the mean of its traits’ Elo z-scores, percentile ranked from 1 to 100 across all models evaluated in the benchmark

Claude Fable 5.1 vs JT-4.1 Flash 236B A21B: Release Comparison

Intelligence

Time per Task

Cost per Task

IntelligenceUpdated

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index

Intelligence Index vs. Cost per Task

Cost per Intelligence Index Task

Artificial Analysis Intelligence Index

Cost

Cost per Intelligence Index Task

Cost per Intelligence Index Task

Speed & Latency

Time per Intelligence Index Task

Time per Intelligence Index Task

Time Period

Capability Scores

Capability Indexes

Benchmarks

AA-PersonalityBenchNew

Personality Indexes