DeepSeek V4.1 Flash 1017 vs Claude Sonnet 5.5: Release Comparison

Name: Intelligence
Creator: Artificial Analysis
License: https://artificialanalysis.ai/docs/legal/Terms-of-Use.pdf

Comparison of the DeepSeek V4.1 Flash 1017 and Claude Sonnet 5.5 releases: 3 and 5 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 8 models.

For intelligence, Claude Sonnet 5.5 scores highest: Claude Sonnet 5.5 (Max, Default Fallback) at 54, against DeepSeek V4.1 Flash 1017 (Max) at 32 for DeepSeek V4.1 Flash 1017.
For output speed, DeepSeek V4.1 Flash 1017 is fastest: DeepSeek V4.1 Flash 1017 (Non-reasoning) at 185 t/s, against Claude Sonnet 5.5 (Max, Default Fallback) at 137 t/s for Claude Sonnet 5.5.
For cost per task, DeepSeek V4.1 Flash 1017 is cheapest: DeepSeek V4.1 Flash 1017 (Non-reasoning) at $0.43, against Claude Sonnet 5.5 (Low, Default Fallback) at $0.51 for Claude Sonnet 5.5.

Model Playground

Releases compared


	Claude Sonnet 5.5 (max with fallback)	Claude Sonnet 5.5 (xhigh with fallback)	Claude Sonnet 5.5 (high with fallback)	DeepSeek V4.1 Flash 1017 (max)	Claude Sonnet 5.5 (medium with fallback)	DeepSeek V4.1 Flash 1017 (high)	Claude Sonnet 5.5 (low with fallback)	DeepSeek V4.1 Flash 1017 (non-reasoning)
Intelligence Index	54	50	41	32	30	29	25	19
Finance & Accounting	56	49	44	42	41	39	36	37
Strategy & Ops	58	54	51	49	47	48	42	40
Legal	52	47	44	38	39	34	37	32
Healthcare & Medical	54	47	44	41	40	--	37	--
Engineering	58	53	46	37	37	34	33	25
Economics	56	50	46	40	41	37	36	34
AA-Briefcase v1.1	1814	1744	1635	1570	1440	1416	1268	1426
AutomationBench-AA	71.8%	65.5%	59.4%	66.6%	54.9%	68.5%	49.4%	48.8%
Terminal-Bench 4.0	63.6%	57.1%	43.9%	33.8%	29.8%	28.8%	20.7%	9.1%
FrontierCode 2.0	41.7%	35.6%	25.7%	28.5%	11.0%	16.8%	7.1%	6.1%
AA-Omniscience v1.1	30	21	19	1	19	2	20	2
GDP.pdf	25.8%	24.6%	25.2%	17.2%	20.2%	14.2%	16.0%	4.4%
HLE-Diamond	53.3%	44.1%	33.8%	25.3%	23.8%	20.8%	20.6%	7.1%
CritPt v2 (Hard Subset)	56.0%	54.0%	47.5%	24.0%	28.5%	26.5%	22.5%	1.0%
Terminal-Bench-Science 0.1	53.3%	52.4%	34.3%	12.9%	16.2%	10.5%	10.5%	2.4%

Cost per TaskUSD	$10.02	$4.09	$1.64	$0.60	$0.78	--	$0.51	$0.43
Input PriceUSD/1M Tokens	$2.00	$2.00	$2.00	$0.30	$2.00	$0.30	$2.00	$0.30
Output PriceUSD/1M Tokens	$10.00	$10.00	$10.00	$1.20	$10.00	$1.20	$10.00	$1.20
Cache Hit PriceUSD/1M Tokens	$0.10	$0.10	$0.10	$0.006	$0.10	$0.006	$0.10	$0.006
Cache Write PriceUSD/1M Tokens	$2.50	$2.50	$2.50	--	$2.50	--	$2.50	--

Output SpeedTokens/s	137	108	107	170	104	--	106	185
Time to First Tokens	514.91	32.94	12.59	1.28	1.22	--	1.15	1.38
Time to First Answer Tokens	514.91	32.94	12.59	13.01	1.22	--	1.15	1.38
End-to-End Response Times	518.56	37.56	17.26	15.94	6.04	--	5.88	4.08
Time per Tasks	1,297.36	719.23	346.14	596.73	188.57	--	128.35	349.80

Context Window	1M	1M	1M	1M	1M	1M	1M	1M
Creator	Anthropic	Anthropic	Anthropic	DeepSeek	Anthropic	DeepSeek	Anthropic	DeepSeek
License	Proprietary	Proprietary	Proprietary	Open	Proprietary	Open	Proprietary	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	Supports: text and image
Output Modality	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text
Providers				+16

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

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

DeepSeek V4.1 Flash 1017

Claude Sonnet 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

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 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

Model AvsModel B

AA-PersonalityBench: Expressiveness Index, DeepSeek V4.1 Flash 1017 (max) vs Claude Sonnet 5.5 (max with fallback)

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

DeepSeek V4.1 Flash 1017 (max)

Claude Sonnet 5.5 (max with fallback)

Lexically Varied

15%

85%

Metaphorical

27%

73%

Natural Sounding

31%

69%

Literate

37%

63%

Eloquent

48%

52%

DeepSeek V4.1 Flash 1017 vs Claude Sonnet 5.5: 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

AA-PersonalityBench: Expressiveness Index, DeepSeek V4.1 Flash 1017 (max) vs Claude Sonnet 5.5 (max with fallback)