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 59, against Claude Sonnet 5.5 (Max, Default Fallback) at 55 for Claude Sonnet 5.5.
For time per task, Claude Sonnet 5.5 is fastest: Claude Sonnet 5.5 (Low, Default Fallback) at 2.6 min, against Claude Opus 5.5 (Low, Default Fallback) at 3.0 min for Claude Opus 5.5.
For cost per task, Claude Sonnet 5.5 is cheapest: Claude Sonnet 5.5 (Low, Default Fallback) at $0.51, against Claude Opus 5.5 (Low, Default Fallback) at $0.98 for Claude Opus 5.5.

Model Playground

Releases compared


	Claude Opus 5.5 (max)	Claude Opus 5.5 (xhigh)	Claude Sonnet 5.5 (max)	Claude Opus 5.5 (high)	Claude Sonnet 5.5 (xhigh)	Claude Opus 5.5 (medium)	Claude Sonnet 5.5 (high)	Claude Opus 5.5 (low)	Claude Sonnet 5.5 (medium)	Claude Sonnet 5.5 (low)
Intelligence Index	59	57	55	52	50	48	42	35	31	26
Finance & Accounting	59	56	56	53	49	51	44	42	41	36
Strategy & Ops	61	59	58	58	54	56	51	48	47	42
Legal	58	55	52	52	47	50	44	43	39	37
Healthcare & Medical	58	56	54	52	47	51	44	45	40	37
Engineering	65	63	58	58	54	54	46	43	37	33
Economics	60	58	54	55	48	53	45	44	39	35
AA-Briefcase v1.1	1800	1760	1813	1682	1742	1620	1634	1279	1439	1268
AutomationBench-AA	69.5%	65.0%	71.8%	63.2%	65.5%	61.2%	59.4%	52.9%	54.9%	49.4%
Terminal-Bench 4.0	59.6%	59.6%	63.6%	56.6%	57.1%	52.5%	43.9%	31.3%	29.8%	20.7%
FrontierCode 2.0	46.4%	43.8%	41.7%	35.9%	35.6%	33.1%	25.7%	15.8%	11.0%	7.1%
AA-Omniscience v1.1	48	43	30	42	21	40	19	39	19	20
GDP.pdf	26.2%	26.6%	25.8%	28.8%	24.6%	25.6%	25.2%	25.6%	20.2%	16.0%
HLE-Diamond	67.9%	64.0%	53.3%	55.6%	44.1%	51.4%	33.8%	41.7%	23.8%	20.6%
CritPt v2 (Hard Subset)	68.0%	67.5%	59.0%	59.5%	57.5%	54.0%	51.5%	36.0%	33.5%	26.0%
Terminal-Bench-Science 0.1	59.0%	61.9%	53.3%	49.0%	52.4%	43.3%	34.3%	24.3%	16.2%	10.5%

Cost per TaskUSD	$10.04	$6.05	$10.02	$3.46	$4.09	$2.45	$1.64	$0.98	$0.78	$0.51
Input PriceUSD/1M Tokens	$4.00	$4.00	$2.00	$4.00	$2.00	$4.00	$2.00	$4.00	$2.00	$2.00
Output PriceUSD/1M Tokens	$20.00	$20.00	$10.00	$20.00	$10.00	$20.00	$10.00	$20.00	$10.00	$10.00
Cache Hit PriceUSD/1M Tokens	$0.20	$0.20	$0.10	$0.20	$0.10	$0.20	$0.10	$0.20	$0.10	$0.10
Cache Write PriceUSD/1M Tokens	$5.00	$5.00	$2.50	$5.00	$2.50	$5.00	$2.50	$5.00	$2.50	$2.50

Time per TaskMinutes	25.4	16.4	31.5	9.6	15.2	7.1	7.2	3.0	3.7	2.6
Output Speedtok/s	114	105	151	104	134	102	136	104	139	133
Time to First Answer Tokens	411.05	94.28	307.65	31.55	27.50	14.71	9.34	6.38	4.21	2.35
Time to First Tokens	411.05	94.28	307.65	31.55	27.50	14.71	9.34	6.38	4.21	2.35
End-to-End TimeMean of Single-Request Workloads (s)	830.88	246.10	607.46	122.91	74.65	80.83	40.76	53.35	25.97	21.41

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

Updated

Intelligence

Artificial Analysis Intelligence Index · Higher is better

Time per Task

Inference time (minutes) per Intelligence Index task · Lower 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 v5.0.1 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 v5.0.1 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

Claude Sonnet 5.5

Claude Opus 5.5

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

Time per Intelligence Index Task

Output tokens divided by end-to-end output speed (minutes per Intelligence Index task) · Speed at the model's own endpoint or the median across providers · Lower is better

No publicly available API

The weighted average time (minutes) per Artificial Analysis Intelligence Index task: output tokens per task divided by output speed, weighted by each benchmark's weight in the Intelligence Index.

Speed and latency metrics average each endpoint's runs over the past 5 days, and the error rate pools them. We run the benchmark every 6 hours, and endpoints of deprecated models every 18 hours.

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

Benchmarks

AA-PersonalityBenchNew

Model AvsModel B

AA-PersonalityBench: Expressiveness Index, Claude Sonnet 5.5 (max) vs Claude Opus 5.5 (max)

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

Claude Sonnet 5.5 (max)

Claude Opus 5.5 (max)

Lexically Varied

17%

83%

Eloquent

23%

77%

Natural Sounding

28%

72%

Metaphorical

32%

68%

Literate

40%

60%

Claude Sonnet 5.5 vs Claude Opus 5.5: Release Comparison

Intelligence

Time per Task

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

Time per Intelligence Index Task

Time per Intelligence Index Task

Time Period

Capability Scores

Capability Indexes

Benchmarks

AA-PersonalityBenchNew

AA-PersonalityBench: Expressiveness Index, Claude Sonnet 5.5 (max) vs Claude Opus 5.5 (max)