Claude Opus 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 Opus 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 Opus 5.5 scores highest: Claude Opus 5.5 (Max, Default Fallback) at 58, against GPT-6 Astra (Max) at 53 for GPT-6 Astra.
For output speed, Claude Opus 5.5 is fastest: Claude Opus 5.5 (Max, Default Fallback) at 96 t/s, against GPT-6 Astra (Max) at 47 t/s for GPT-6 Astra.
For cost per task, Claude Opus 5.5 is cheapest: Claude Opus 5.5 (Low, Default Fallback) at $0.55, against GPT-6 Astra (Low) at $0.82 for GPT-6 Astra.

Model Playground

Releases compared


	Claude Opus 5.5 (max with fallback)	Claude Opus 5.5 (xhigh with fallback)	Claude Opus 5.5 (high with fallback)	GPT-6 Astra (max)	GPT-6 Astra (xhigh)	Claude Opus 5.5 (medium with fallback)	GPT-6 Astra (high)	GPT-6 Astra (medium)	GPT-6 Astra (low)	Claude Opus 5.5 (low with fallback)
Intelligence Index	58	56	54	53	52	51	51	50	46	42
Finance & Accounting	61	58	56	55	54	54	53	52	49	46
Strategy & Ops	64	62	59	57	57	57	55	54	50	48
Legal	63	61	59	59	58	57	58	57	53	52
Healthcare & Medical	61	--	--	52	--	--	--	--	--	--
Engineering	60	59	56	55	55	54	53	52	48	45
Economics	66	63	61	60	59	60	58	58	55	53
AA-Briefcase v1.1	1807	1768	1690	1569	1544	1628	1507	1459	1261	1280
GDPval-AA v2.1	1866	1837	1705	1542	1516	1586	1485	1468	1366	1235
AutomationBench-AA	69.5%	65.0%	63.2%	68.5%	67.2%	61.2%	66.6%	64.6%	59.1%	52.9%
Terminal-Bench 4.0	59.6%	59.6%	56.6%	59.1%	59.6%	52.5%	54.0%	49.5%	41.9%	31.3%
SciCode	66.9%	65.0%	60.4%	56.5%	55.7%	59.3%	55.4%	54.2%	54.1%	58.6%
Humanity's Last Exam	61.4%	57.5%	55.6%	54.7%	54.6%	54.7%	53.1%	52.7%	49.2%	48.3%
GDP.pdf	26.2%	26.6%	28.8%	31.0%	32.2%	25.6%	31.0%	30.4%	30.4%	25.6%
CritPt	31.7%	31.7%	30.9%	31.7%	31.4%	27.7%	28.9%	29.1%	26.3%	17.7%
AA-Omniscience	46	43	41	43	43	40	44	42	41	39
AA-LCR v1.1	84.7%	84.7%	82.7%	80.7%	80.0%	84.3%	80.0%	79.7%	80.0%	80.7%

Cost per TaskUSD	$5.98	$3.46	$1.82	$3.26	$2.31	$1.34	$1.73	$1.54	$0.82	$0.55
Input PriceUSD/1M Tokens	$4.00	$4.00	$4.00	$10.00	$10.00	$4.00	$10.00	$10.00	$10.00	$4.00
Output PriceUSD/1M Tokens	$20.00	$20.00	$20.00	$50.00	$50.00	$20.00	$50.00	$50.00	$50.00	$20.00
Cache Hit PriceUSD/1M Tokens	$0.20	$0.20	$0.20	$1.00	$1.00	$0.20	$1.00	$1.00	$1.00	$0.20
Cache Write PriceUSD/1M Tokens	$5.00	$5.00	$5.00	$12.50	$12.50	$5.00	$12.50	$12.50	$12.50	$5.00

Output SpeedTokens/s	96	81	77	47	43	76	42	41	42	71
Time to First Tokens	662.12	127.81	36.37	383.62	203.38	21.66	83.11	6.03	2.69	8.65
Time to First Answer Tokens	662.12	127.81	36.37	383.62	203.38	21.66	83.11	6.03	2.69	8.65
End-to-End Response Times	667.31	134.00	42.91	394.19	215.00	28.28	94.91	18.14	14.60	15.71
Time per Tasks	782.12	507.72	284.55	574.33	391.40	206.13	271.44	234.81	102.88	85.74

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

Not publicly available

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

Not publicly available

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: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, 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 Opus 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 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