Claude Sonnet 5.5 vs Claude Opus 5.5: 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 Claude Opus 5.5 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 Claude Sonnet 5.5 (Max, Default Fallback) at 56 for Claude Sonnet 5.5.
For output speed, Claude Sonnet 5.5 is fastest: Claude Sonnet 5.5 (Max, Default Fallback) at 136 t/s, against Claude Opus 5.5 (Max, Default Fallback) at 98 t/s for Claude Opus 5.5.
For cost per task, Claude Sonnet 5.5 is cheapest: Claude Sonnet 5.5 (Low, Default Fallback) at $0.35, against Claude Opus 5.5 (Low, Default Fallback) at $0.55 for Claude Opus 5.5.

Model Playground

Releases compared


	Claude Opus 5.5 (max with fallback)	Claude Sonnet 5.5 (max with fallback)	Claude Opus 5.5 (xhigh with fallback)	Claude Opus 5.5 (high with fallback)	Claude Sonnet 5.5 (xhigh with fallback)	Claude Opus 5.5 (medium with fallback)	Claude Sonnet 5.5 (high with fallback)	Claude Opus 5.5 (low with fallback)	Claude Sonnet 5.5 (medium with fallback)	Claude Sonnet 5.5 (low with fallback)
Intelligence Index	58	56	56	54	52	51	47	42	41	36
Finance & Accounting	61	57	58	56	52	54	47	46	41	38
Strategy & Ops	64	60	62	59	56	57	52	48	45	41
Legal	63	56	61	59	52	57	49	52	44	41
Healthcare & Medical	61	58	--	--	--	--	--	--	--	--
Engineering	60	58	59	56	54	54	48	45	42	38
Economics	66	61	63	61	56	60	52	53	47	44
AA-Briefcase v1.1	1803	1817	1764	1686	1751	1625	1636	1280	1441	1272
GDPval-AA v2.1	1866	1838	1831	1704	1728	1584	1549	1235	1323	1175
AutomationBench-AA	69.5%	71.8%	65.0%	63.2%	65.5%	61.2%	59.4%	52.9%	54.9%	49.4%
Terminal-Bench 4.0	59.6%	63.6%	59.6%	56.6%	57.1%	52.5%	43.9%	31.3%	29.8%	20.7%
SciCode	66.9%	61.0%	65.0%	60.4%	57.3%	59.3%	53.7%	58.6%	52.9%	49.1%
Humanity's Last Exam	61.4%	55.0%	57.5%	55.6%	50.0%	54.7%	45.8%	48.3%	39.8%	36.2%
GDP.pdf	26.2%	25.8%	26.6%	28.8%	24.6%	25.6%	25.2%	25.6%	20.2%	16.0%
CritPt	31.7%	31.4%	31.7%	30.9%	31.1%	27.7%	24.6%	17.7%	16.9%	11.4%
AA-Omniscience	46	32	43	41	24	40	21	39	20	19
AA-LCR v1.1	84.7%	82.7%	84.7%	82.7%	79.7%	84.3%	78.0%	80.7%	76.3%	76.0%

Cost per TaskUSD	$5.98	$5.46	$3.46	$1.82	$2.01	$1.34	$0.88	$0.55	$0.48	$0.35
Input PriceUSD/1M Tokens	$4.00	$2.00	$4.00	$4.00	$2.00	$4.00	$2.00	$4.00	$2.00	$2.00
Output PriceUSD/1M Tokens	$20.00	$10.00	$20.00	$20.00	$10.00	$20.00	$10.00	$20.00	$10.00	$10.00
Cache Hit PriceUSD/1M Tokens	$0.20	$0.10	$0.20	$0.20	$0.10	$0.20	$0.10	$0.20	$0.10	$0.10
Cache Write PriceUSD/1M Tokens	$5.00	$2.50	$5.00	$5.00	$2.50	$5.00	$2.50	$5.00	$2.50	$2.50

Output SpeedTokens/s	98	136	85	82	112	80	110	78	109	109
Time to First Tokens	562.75	391.60	115.10	40.49	36.17	22.95	11.62	9.89	1.11	0.96
Time to First Answer Tokens	562.75	391.60	115.10	40.49	36.17	22.95	11.62	9.89	1.11	0.96
End-to-End Response Times	567.87	395.28	120.99	46.58	40.64	29.22	16.17	16.27	5.70	5.55
Time per Tasks	787.75	892.98	489.45	270.91	423.96	200.41	218.05	81.38	126.27	84.16

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

Claude Opus 5.5

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 Claude Opus 5.5: 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