Claude Opus 5.5 vs gpt-oss-120b: 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-oss-120b releases: 5 and 2 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 7 models.

For output speed, gpt-oss-120b is fastest: gpt-oss-120b (Low) at 250 t/s, against Claude Opus 5.5 (Max, Default Fallback) at 97 t/s for Claude Opus 5.5.

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)	Claude Opus 5.5 (medium with fallback)	Claude Opus 5.5 (low with fallback)	gpt-oss-120b (high)	gpt-oss-120b (low)
Intelligence Index	58	57	52	48	35	--	--
Finance & Accounting	59	56	53	51	42	--	--
Strategy & Ops	61	59	58	56	48	--	--
Legal	58	55	52	50	43	--	--
Healthcare & Medical	58	56	52	51	45	--	--
Engineering	65	62	58	54	43	--	--
Economics	62	60	57	54	45	--	--
AA-Briefcase v1.1	1801	1761	1682	1622	1279	0	--
AutomationBench-AA	69.5%	65.0%	63.2%	61.2%	52.9%	0.2%	--
Terminal-Bench 4.0	59.6%	59.6%	56.6%	52.5%	31.3%	0.0%	--
FrontierCode 2.0	46.4%	43.8%	35.9%	33.1%	15.8%	--	--
AA-Omniscience v1.1	48	43	42	40	39	--	--
GDP.pdf	26.2%	26.6%	28.8%	25.6%	25.6%	4.0%	--
HLE-Diamond	67.9%	64.0%	55.6%	51.4%	41.7%	3.8%	--
CritPt v2 (Hard Subset)	61.0%	63.0%	58.0%	52.5%	33.5%	--	--
Terminal-Bench-Science 0.1	59.0%	61.9%	49.0%	43.3%	24.3%	0.0%	--

Cost per TaskUSD	$10.04	$6.05	$3.46	$2.45	$0.98	--	--
Input PriceUSD/1M Tokens	$4.00	$4.00	$4.00	$4.00	$4.00	$0.15	$0.125
Output PriceUSD/1M Tokens	$20.00	$20.00	$20.00	$20.00	$20.00	$0.60	$0.595
Cache Hit PriceUSD/1M Tokens	$0.20	$0.20	$0.20	$0.20	$0.20	$0.10	$0.125
Cache Write PriceUSD/1M Tokens	$5.00	$5.00	$5.00	$5.00	$5.00	--	--

Output SpeedTokens/s	97	85	80	80	78	206	250
Time to First Tokens	729.62	127.23	34.52	16.41	6.16	0.81	0.74
Time to First Answer Tokens	729.62	127.23	34.52	16.41	6.16	10.50	8.73
End-to-End Response Times	734.79	133.08	40.80	22.69	12.60	12.92	10.73
Time per Tasks	1,140.78	792.74	473.90	346.91	153.00	--	--

Context Window	1M	1M	1M	1M	1M	131k	131k
Creator	Anthropic	Anthropic	Anthropic	Anthropic	Anthropic	OpenAI	OpenAI
License	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Open	Open
Input Modality	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text	Supports: text
Output Modality	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text
Providers						+12	+11

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

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

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

Personality Indexes

Each axis is one of 8 personality indexes: the mean of its traits’ Elo z-scores, percentile ranked from 1 to 100 across all models evaluated in the benchmark

Claude Opus 5.5 vs gpt-oss-120b: 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

Personality Indexes