Claude Sonnet 5.5 vs GPT-6 Astra: Release Comparison

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

Comparison of the Claude Sonnet 5.5 and GPT-6 Astra 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, Claude Sonnet 5.5 scores highest: Claude Sonnet 5.5 (Max, Default Fallback) at 56, against GPT-6 Astra (Max) at 53 for GPT-6 Astra.
For output speed, Claude Sonnet 5.5 is fastest: Claude Sonnet 5.5 (Max, Default Fallback) at 140 t/s, against GPT-6 Astra (Max) at 65 t/s for GPT-6 Astra.
For cost per task, Claude Sonnet 5.5 is cheapest: Claude Sonnet 5.5 (Low, Default Fallback) at $0.35, against GPT-6 Astra (Low) at $0.82 for GPT-6 Astra.

Model Playground

Releases compared


	Claude Sonnet 5.5 (max with fallback)	GPT-6 Astra (max)	GPT-6 Astra (xhigh)	Claude Sonnet 5.5 (xhigh with fallback)	GPT-6 Astra (high)	GPT-6 Astra (medium)	Claude Sonnet 5.5 (high with fallback)	GPT-6 Astra (low)	Claude Sonnet 5.5 (medium with fallback)	Claude Sonnet 5.5 (low with fallback)
Intelligence Index	56	53	52	52	51	50	47	46	41	36
Finance & Accounting	57	55	54	52	53	52	47	49	41	38
Strategy & Ops	60	57	57	56	55	54	52	50	45	41
Legal	56	59	58	52	58	57	49	53	44	41
Healthcare & Medical	58	52	--	--	--	--	--	--	--	--
Engineering	58	55	55	54	53	52	48	48	42	38
Economics	61	60	59	56	58	58	52	55	47	44
AA-Briefcase v1.1	1817	1569	1547	1751	1506	1461	1636	1257	1441	1272
GDPval-AA v2.1	1838	1573	1556	1728	1523	1486	1549	1389	1323	1175
AutomationBench-AA	71.8%	68.5%	67.2%	65.5%	66.6%	64.6%	59.4%	59.1%	54.9%	49.4%
Terminal-Bench 4.0	63.6%	59.1%	59.6%	57.1%	54.0%	49.5%	43.9%	41.9%	29.8%	20.7%
SciCode	61.0%	56.5%	55.7%	57.3%	55.4%	54.2%	53.7%	54.1%	52.9%	49.1%
Humanity's Last Exam	55.0%	54.7%	54.6%	50.0%	53.1%	52.7%	45.8%	49.2%	39.8%	36.2%
GDP.pdf	25.8%	31.0%	32.2%	24.6%	31.0%	30.4%	25.2%	30.4%	20.2%	16.0%
CritPt	31.4%	31.7%	31.4%	31.1%	28.9%	29.1%	24.6%	26.3%	16.9%	11.4%
AA-Omniscience	32	43	43	24	44	42	21	41	20	19
AA-LCR v1.1	82.7%	80.7%	80.0%	79.7%	80.0%	79.7%	78.0%	80.0%	76.3%	76.0%

Cost per TaskUSD	$5.46	$3.26	$2.31	$2.01	$1.73	$1.54	$0.88	$0.82	$0.48	$0.35
Input PriceUSD/1M Tokens	$2.00	$10.00	$10.00	$2.00	$10.00	$10.00	$2.00	$10.00	$2.00	$2.00
Output PriceUSD/1M Tokens	$10.00	$50.00	$50.00	$10.00	$50.00	$50.00	$10.00	$50.00	$10.00	$10.00
Cache Hit PriceUSD/1M Tokens	$0.10	$1.00	$1.00	$0.10	$1.00	$1.00	$0.10	$1.00	$0.10	$0.10
Cache Write PriceUSD/1M Tokens	$2.50	$12.50	$12.50	$2.50	$12.50	$12.50	$2.50	$12.50	$2.50	$2.50

Output SpeedTokens/s	140	65	56	113	54	50	111	56	109	110
Time to First Tokens	380.34	285.18	163.36	35.54	88.82	5.54	11.62	2.26	1.11	0.96
Time to First Answer Tokens	380.34	285.18	163.36	35.54	88.82	5.54	11.62	2.26	1.11	0.96
End-to-End Response Times	383.92	292.88	172.23	39.95	98.10	15.59	16.11	11.11	5.71	5.52
Time per Tasks	888.62	412.48	299.95	426.53	217.12	190.64	216.42	78.02	129.14	85.55

Context Window	1M	1M	1M	1M	1M	1M	1M	1M	1M	1M
Creator	Anthropic	OpenAI	OpenAI	Anthropic	OpenAI	OpenAI	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

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

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 Task

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

Most attractive quadrant

Claude Sonnet 5.5

GPT-6 Astra

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 Intelligence Index task · Segmented by token type · Lower is better

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 Sonnet 5.5 vs GPT-6 Astra: Release Comparison

Intelligence

Speed

Cost per Task

Intelligence

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