Claude Fable 5.1 vs Qwen3.8 27B: 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 Qwen3.8 27B releases: 5 and 4 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 9 models.

For intelligence, Claude Fable 5.1 scores highest: Claude Fable 5.1 (Max, Default Fallback) at 53, against Qwen3.8 27B (Xhigh) at 34 for Qwen3.8 27B.
For output speed, Claude Fable 5.1 is fastest: Claude Fable 5.1 (Max, Default Fallback) at 67 t/s, against Qwen3.8 27B (Low) at 53 t/s for Qwen3.8 27B.
For cost per task, Qwen3.8 27B is cheapest: Qwen3.8 27B (Xhigh) at $1.01, against Claude Fable 5.1 (Low, Default Fallback) at $2.37 for Claude Fable 5.1.

Model Playground

Releases compared


	Claude Fable 5.1 (max with fallback)	Claude Fable 5.1 (xhigh with fallback)	Claude Fable 5.1 (high with fallback)	Claude Fable 5.1 (medium with fallback)	Claude Fable 5.1 (low with fallback)	Qwen3.8 27B (xhigh)	Qwen3.8 27B (medium)	Qwen3.8 27B (low)	Qwen3.8 27B (non-reasoning)
Intelligence Index	53	53	51	49	47	34	28	26	20
Finance & Accounting	56	56	54	51	49	34	28	27	19
Strategy & Ops	60	58	56	54	51	37	34	29	16
Legal	60	61	58	57	53	35	27	28	22
Healthcare & Medical	58	--	--	--	--	34	--	--	--
Engineering	56	57	54	51	49	33	25	24	22
Economics	63	62	60	58	55	43	31	32	30
AA-Briefcase v1.1	1675	1656	1581	1528	1482	1397	1377	1273	898
GDPval-AA v2.1	1756	1733	1633	1545	1468	1419	1381	1362	1072
AutomationBench-AA	59.4%	57.8%	55.3%	54.7%	52.2%	48.2%	40.3%	30.1%	12.4%
Terminal-Bench 4.0	52.0%	55.1%	52.0%	44.9%	40.4%	5.6%	5.1%	2.5%	0.0%
SciCode	63.1%	60.9%	58.7%	56.4%	56.7%	46.6%	39.0%	40.0%	36.2%
Humanity's Last Exam	59.1%	58.7%	55.9%	53.8%	48.9%	33.9%	14.1%	14.0%	12.1%
GDP.pdf	26.2%	26.2%	26.8%	26.8%	28.0%	16.6%	12.8%	10.4%	5.2%
CritPt	29.7%	31.1%	30.3%	29.1%	27.7%	5.4%	0.0%	0.0%	0.3%
AA-Omniscience	43	42	41	38	34	−10	−36	−27	−8
AA-LCR v1.1	85.3%	83.0%	83.7%	84.7%	82.3%	82.0%	79.7%	77.3%	69.3%

Cost per TaskUSD	$7.63	$5.98	$3.91	$2.98	$2.37	$1.01	$1.13	$1.05	$2.49
Input PriceUSD/1M Tokens	$10.00	$10.00	$10.00	$10.00	$10.00	$0.50	$0.50	$0.50	$0.50
Output PriceUSD/1M Tokens	$50.00	$50.00	$50.00	$50.00	$50.00	$3.00	$3.00	$3.00	$3.00
Cache Hit PriceUSD/1M Tokens	$0.25	$0.25	$0.25	$0.25	$0.25	$0.10	$0.10	$0.10	$0.10
Cache Write PriceUSD/1M Tokens	$12.50	$12.50	$12.50	$12.50	$12.50	--	--	--	--

Output SpeedTokens/s	67	62	52	54	56	46	50	53	52
Time to First Tokens	259.33	118.26	19.85	12.09	1.95	3.80	3.85	3.78	3.82
Time to First Answer Tokens	259.33	118.26	19.85	12.09	1.95	46.95	43.74	41.73	3.82
End-to-End Response Times	266.81	126.37	29.42	21.32	10.93	57.74	53.72	51.22	13.45
Time per Tasks	726.68	596.03	431.69	311.23	238.60	1,075.04	988.94	820.57	545.11

Context Window	1M	1M	1M	1M	1M	256k	256k	256k	256k
Creator	Anthropic	Anthropic	Anthropic	Anthropic	Anthropic	Alibaba	Alibaba	Alibaba	Alibaba
License	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Open	Open	Open	Open
Input Modality	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text, image, and video	Supports: text, image, and video	Supports: text, image, and video	Supports: text, image, and video
Output Modality	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text
Providers						+6			+3

Intelligence

Artificial Analysis Intelligence Index · Higher is better

Speed

Output tokens per second · Higher is better

Cost per Task

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

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v4.3.2 incorporates 10 evaluations: AA-Briefcase v1.1, GDPval-AA v2.1, AutomationBench-AA, Terminal-Bench 4.0, SciCode, Humanity's Last Exam, GDP.pdf, CritPt, AA-Omniscience, AA-LCR v1.1

No publicly available API

Artificial Analysis Intelligence Index v4.3.2 includes: AA-Briefcase v1.1, GDPval-AA v2.1, AutomationBench-AA, Terminal-Bench 4.0, SciCode, Humanity's Last Exam, GDP.pdf, CritPt, AA-Omniscience, AA-LCR v1.1. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Intelligence Index vs. Cost per Intelligence Index 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

GDPval-AA v2.1

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 Artificial Analysis Intelligence Index task, segmented by token type. Lower is better

No publicly available API

Speed & Latency

Output Speed

Output tokens per second · Higher is better

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Figures represent performance of the model's first-party API or the median across providers where a first-party API is not available.

Capability Scores

Capability Indexes

Measures the performance of models on specific capabilities and industries

Finance & Accounting Index

Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better

Strategy & Ops Index

Incorporates 6 evaluations: GDPval-AA v2.1, AA-Briefcase v1.1, AA-Omniscience, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better

Legal Index

Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AA-LCR v1.1, GDP.pdf, AutomationBench-AA · Higher is better

Healthcare & Medical Index

Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, MLCR-AA, Humanity's Last Exam, AutomationBench-AA · Higher is better

Engineering Index

Incorporates 6 evaluations: AA-Omniscience, Humanity's Last Exam, CritPt, GDPval-AA v2.1, AA-Briefcase v1.1, Terminal-Bench 4.0 · Higher is better

Economics Index

Incorporates 5 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2.1, AA-Briefcase v1.1, AA-LCR v1.1 · Higher is better

Claude Fable 5.1 vs Qwen3.8 27B: Release Comparison

Intelligence

Speed

Cost per Task

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index

Intelligence Index vs. Cost per Intelligence Index Task

Cost per Intelligence Index Task

Artificial Analysis Intelligence Index

Cost

Cost per Intelligence Index Task

Cost per Intelligence Index Task

Speed & Latency

Output Speed

Output Speed

Model Performance Representation

Capability Scores

Capability Indexes