Claude Opus 5.5 vs DeepSeek V4.1 Flash: 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 DeepSeek V4.1 Flash 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 intelligence, Claude Opus 5.5 scores highest: Claude Opus 5.5 (Max, Default Fallback) at 58, against DeepSeek V4.1 Flash (Max) at 39 for DeepSeek V4.1 Flash.
For output speed, DeepSeek V4.1 Flash is fastest: DeepSeek V4.1 Flash (Max) at 174 t/s, against Claude Opus 5.5 (Max, Default Fallback) at 95 t/s for Claude Opus 5.5.
For cost per task, DeepSeek V4.1 Flash is cheapest: DeepSeek V4.1 Flash (Non-reasoning) at $0.15, 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 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)	DeepSeek V4.1 Flash (max)	DeepSeek V4.1 Flash (non-reasoning)
Intelligence Index	58	56	54	51	42	39	25
Finance & Accounting	61	58	56	54	46	45	30
Strategy & Ops	64	62	59	57	48	52	36
Legal	63	61	59	57	52	41	30
Healthcare & Medical	61	--	--	--	--	41	--
Engineering	60	59	56	54	45	39	25
Economics	66	63	61	60	53	44	32
AA-Briefcase v1.1	1805	1764	1687	1625	1280	1422	1118
GDPval-AA v2.1	1866	1831	1704	1584	1235	1600	1341
AutomationBench-AA	69.5%	65.0%	63.2%	61.2%	52.9%	68.9%	47.8%
Terminal-Bench 4.0	59.6%	59.6%	56.6%	52.5%	31.3%	26.8%	5.6%
SciCode	66.9%	65.0%	60.4%	59.3%	58.6%	51.9%	35.5%
Humanity's Last Exam	61.4%	57.5%	55.6%	54.7%	48.3%	39.2%	10.8%
GDP.pdf	26.2%	26.6%	28.8%	25.6%	25.6%	12.8%	3.8%
CritPt	31.7%	31.7%	30.9%	27.7%	17.7%	14.3%	0.3%
AA-Omniscience	46	43	41	40	39	−5	−10
AA-LCR v1.1	84.7%	84.7%	82.7%	84.3%	80.7%	84.0%	55.3%

Cost per TaskUSD	$5.98	$3.46	$1.82	$1.34	$0.55	$0.27	$0.15
Input PriceUSD/1M Tokens	$4.00	$4.00	$4.00	$4.00	$4.00	$0.30	$0.30
Output PriceUSD/1M Tokens	$20.00	$20.00	$20.00	$20.00	$20.00	$1.20	$1.20
Cache Hit PriceUSD/1M Tokens	$0.20	$0.20	$0.20	$0.20	$0.20	$0.006	$0.006
Cache Write PriceUSD/1M Tokens	$5.00	$5.00	$5.00	$5.00	$5.00	--	--

Output SpeedTokens/s	95	76	74	79	78	174	167
Time to First Tokens	661.15	141.84	51.91	24.27	9.05	1.13	1.13
Time to First Answer Tokens	661.15	141.84	51.91	24.27	9.05	12.63	1.13
End-to-End Response Times	666.41	148.44	58.72	30.59	15.49	15.51	4.12
Time per Tasks	797.48	518.33	291.93	219.84	86.63	352.52	206.43

Context Window	1M	1M	1M	1M	1M	1M	1M
Creator	Anthropic	Anthropic	Anthropic	Anthropic	Anthropic	DeepSeek	DeepSeek
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 and image	Supports: text and image
Output Modality	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text
Providers						+15	+4

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 Intelligence Index Task

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

Most attractive quadrant

Claude Opus 5.5

DeepSeek V4.1 Flash

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 Opus 5.5 vs DeepSeek V4.1 Flash: 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