GPT-6 Astra vs Claude Fable 5.1: Release Comparison

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

Comparison of the GPT-6 Astra and Claude Fable 5.1 releases: 5 and 5 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 10 models.

For intelligence, GPT-6 Astra scores highest: GPT-6 Astra (Max) at 57, against Claude Fable 5.1 (Xhigh, Default Fallback) at 50 for Claude Fable 5.1.
For output speed, GPT-6 Astra is fastest: GPT-6 Astra (Max) at 71 t/s, against Claude Fable 5.1 (Max, Default Fallback) at 70 t/s for Claude Fable 5.1.
For cost per task, GPT-6 Astra is cheapest: GPT-6 Astra (Low) at $1.42, against Claude Fable 5.1 (Low, Default Fallback) at $4.47 for Claude Fable 5.1.

Model Playground

Releases compared


	GPT-6 Astra (max)	GPT-6 Astra (xhigh)	GPT-6 Astra (high)	GPT-6 Astra (medium)	Claude Fable 5.1 (xhigh with fallback)	Claude Fable 5.1 (max with fallback)	Claude Fable 5.1 (high with fallback)	GPT-6 Astra (low)	Claude Fable 5.1 (medium with fallback)	Claude Fable 5.1 (low with fallback)
Intelligence Index	57	55	55	51	50	49	47	43	43	38
Finance & Accounting	57	57	56	54	54	54	50	48	47	48
Strategy & Ops	58	58	57	56	56	58	54	50	52	51
Legal	56	56	55	52	54	54	50	48	48	47
Healthcare & Medical	54	53	52	50	51	51	48	45	45	44
Engineering	62	60	60	57	57	57	54	50	50	45
Economics	58	58	57	54	58	59	54	48	51	49
AA-Briefcase v1.1	1569	1544	1505	1462	1651	1670	1577	1256	1525	1479
AutomationBench-AA	68.5%	67.2%	66.6%	64.6%	57.8%	59.4%	55.3%	59.1%	54.7%	52.2%
Terminal-Bench 4.0	59.1%	59.6%	54.0%	49.5%	55.1%	52.0%	52.0%	41.9%	44.9%	40.4%
FrontierCode 2.0	42.4%	41.4%	40.1%	36.6%	35.7%	31.6%	30.3%	26.2%	28.8%	22.8%
AA-Omniscience v1.1	42	44	45	41	44	46	40	40	36	34
GDP.pdf	31.0%	32.2%	31.0%	30.4%	26.2%	26.2%	26.8%	30.4%	26.8%	28.0%
HLE-Diamond	63.8%	61.5%	59.3%	52.7%	58.8%	60.1%	50.4%	45.1%	45.0%	37.4%
CritPt v2 (Hard Subset)	70.5%	70.5%	71.5%	71.0%	56.5%	51.0%	60.5%	60.0%	56.5%	47.5%
Terminal-Bench-Science 0.1	63.3%	54.8%	59.5%	53.3%	40.5%	43.3%	39.5%	37.1%	29.0%	21.4%

Cost per TaskUSD	$6.24	$3.66	$3.24	$2.73	$10.85	$12.99	$7.54	$1.42	$5.56	$4.47
Input PriceUSD/1M Tokens	$10.00	$10.00	$10.00	$10.00	$10.00	$10.00	$10.00	$10.00	$10.00	$10.00
Output PriceUSD/1M Tokens	$50.00	$50.00	$50.00	$50.00	$50.00	$50.00	$50.00	$50.00	$50.00	$50.00
Cache Hit PriceUSD/1M Tokens	$1.00	$1.00	$1.00	$1.00	$0.25	$0.25	$0.25	$1.00	$0.25	$0.25
Cache Write PriceUSD/1M Tokens	$12.50	$12.50	$12.50	$12.50	$12.50	$12.50	$12.50	$12.50	$12.50	$12.50

Output SpeedTokens/s	71	68	62	55	63	70	58	54	58	56
Time to First Tokens	368.87	202.66	106.70	6.03	75.86	252.52	19.37	2.55	14.36	2.80
Time to First Answer Tokens	368.87	202.66	106.70	6.03	75.86	252.52	19.37	2.55	14.36	2.80
End-to-End Response Times	375.95	210.02	114.77	15.12	83.78	259.71	28.06	11.76	23.05	11.66
Time per Tasks	726.72	398.99	373.17	335.33	958.65	1,066.42	693.25	165.78	525.53	408.64

Context Window	1M	1M	1M	1M	1M	1M	1M	1M	1M	1M
Creator	OpenAI	OpenAI	OpenAI	OpenAI	Anthropic	Anthropic	Anthropic	OpenAI	Anthropic	Anthropic
License	Proprietary	Proprietary	Proprietary	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	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	Supports: text	Supports: text	Supports: text
Providers

Updated

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

IntelligenceUpdated

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v5.0 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 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

GPT-6 Astra

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

Output Speed

Output tokens per second · Higher is better

No publicly available API

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

Benchmarks

AA-PersonalityBenchNew

Model AvsModel B

AA-PersonalityBench: Expressiveness Index, GPT-6 Astra (max) vs Claude Fable 5.1 (max with fallback)

Chance each model’s answer is judged to show more of each trait from their Elo gap · 50% is an even match

GPT-6 Astra (max)

Claude Fable 5.1 (max with fallback)

Lexically Varied

99%

Eloquent

98%

Metaphorical

95%

Natural Sounding

92%

Literate

42%

58%

GPT-6 Astra vs Claude Fable 5.1: Release Comparison

Intelligence

Speed

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

Output Speed

Output Speed

Model Performance Representation

Capability Scores

Capability Indexes

Benchmarks

AA-PersonalityBenchNew

AA-PersonalityBench: Expressiveness Index, GPT-6 Astra (max) vs Claude Fable 5.1 (max with fallback)