DeepSeek V4.1 Flash vs Nemotron 3 Ultra

DeepSeek V4.1 Flash leads Nemotron 3 Ultra on coding, 62.5 to 30.0 on the Vibe Coding Index, and DeepSeek V4.1 Flash costs 2.9x less per output token ($0.84 vs $2.40 per million). Updated October 22, 2026; 57 benchmarks have a result for both.

Replace DeepSeek V4.1 Flash Replace Nemotron 3 Ultra

DeepSeek V4.1 FlashDeepSeek

Coding: 62.5
Overall: 62.4
Output $/M: $0.84

Nemotron 3 UltraNVIDIA

Coding: 30.0
Overall: 53.1
Output $/M: $2.40

vs boards won of 57 shared

DeepSeek V4.1 Flash or Nemotron 3 Ultra: which to pick

Pick DeepSeek V4.1 Flash for coding: it scores 62.5 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra.

Pick Nemotron 3 Ultra for work measured by LMArena Text: legal and government or DTBench, where it leads.

Model ADeepSeek V4.1 FlashDeepSeek62.5/1005 independent benchmarksNo cost per solved task Model BNemotron 3 UltraNVIDIA30.0/1003 independent benchmarksNo cost per solved task

574514

Shared results: 57
DeepSeek V4.1 Flash only: 45
Nemotron 3 Ultra only: 14
Like-for-like categories: 8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, six public coding benchmarks
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash scores 62.5 against 30.0.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash leads, 24.7 against 22.9.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Nemotron 3 Ultra has a AA Agentic Index result, 20.1.
Directional only
Reasoning
GPQA Diamond
No call
Only Nemotron 3 Ultra has a GPQA Diamond result, 86.1%.
Directional only
Knowledge
MMLU Pro
No call
Only Nemotron 3 Ultra has a MMLU Pro result, 85.8%.
Directional only
Web design
Design Arena: websites
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash leads, 1308 against 1145.
Same board, both measured
Long documents
Listed context window
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash takes 1.05M tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash $0.0006, Nemotron 3 Ultra $0.0018 per turn.
List prices

At a glance

Coding index: DeepSeek V4.1 Flash 62.5 from 5 benchmarks, Nemotron 3 Ultra 30.0 from 3 benchmarks.
Widest category: Coding, 26.3 points apart on average over 8 shared benchmarks.
Widest single gap: Vibe Code Bench (Vals AI): DeepSeek V4.1 Flash 84.7% against Nemotron 3 Ultra 7.6%, 77.1 points apart on a 0 to 100 scale.
Output price: DeepSeek V4.1 Flash $0.84 against Nemotron 3 Ultra $2.40 per million output tokens, 2.9x apart.
Context window: DeepSeek V4.1 Flash takes 1.05M tokens, Nemotron 3 Ultra 262K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	DeepSeek V4.1 Flash	Nemotron 3 Ultra
Coding	8	0
Intelligence	2	0
Agentic work	4	0
Reasoning	6	0
Math	4	0
Knowledge	5	1
Web design	8	0
General	16	3
All shared boards	53	4

CodingLike-for-likeSix of these boards feed the Vibe Coding Index80

Coding benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
LiveBench coding	90.2%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena WebDev	1618	Not measured	Only DeepSeek V4.1 Flash measured
AA Coding Index	Not measured	49.3	Only Nemotron 3 Ultra measured
LiveCodeBench (Vals AI)	Not measured	86.0%	Only Nemotron 3 Ultra measured
SWE-bench Verified (Vals AI)	Not measured	69.0%	Only Nemotron 3 Ultra measured
Terminal-Bench 4 (Vals AI)	19.7%	Not measured	Only DeepSeek V4.1 Flash measured
Vibe Code Bench (Vals AI)	84.7%	7.6%	DeepSeek V4.1 Flash
Code migration (Vals AI)	45.6%	4.9%	DeepSeek V4.1 Flash
ProgramBench (Vals AI)	0.5%	0.0%	DeepSeek V4.1 Flash
IOI (Vals AI)	40.3%	Not measured	Only DeepSeek V4.1 Flash measured
Terminal-Bench 2.1 (Vals AI)	74.5%	50.9%	DeepSeek V4.1 Flash
SWE-bench Multimodal (Vals AI)	46.5%	Not measured	Only DeepSeek V4.1 Flash measured
Vibe Code Bench 1-100 (Vals AI)	16.4%	Not measured	Only DeepSeek V4.1 Flash measured
SkillsBench (Vals AI)	69.8%	Not measured	Only DeepSeek V4.1 Flash measured
CyberBench (Vals AI)	73.7%	Not measured	Only DeepSeek V4.1 Flash measured
SciCode	51.9%	40.3%	DeepSeek V4.1 Flash
Terminal-Bench Hard (Artificial Analysis run)	Not measured	36.4%	Only Nemotron 3 Ultra measured
FrontierCode	43.9%	13.6%	DeepSeek V4.1 Flash
WeirdML	Not measured	43.5%	Only Nemotron 3 Ultra measured
ALE-Bench	1092.3	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text: coding	1502	1468	DeepSeek V4.1 Flash
LMArena Text: software and IT	1496	1468	DeepSeek V4.1 Flash
LMArena WebDev: React	1628	Not measured	Only DeepSeek V4.1 Flash measured
LMArena WebDev: HTML	1612	Not measured	Only DeepSeek V4.1 Flash measured
LMArena WebDev: from an image	1606	Not measured	Only DeepSeek V4.1 Flash measured
Neither model has a result on the other 18 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20

Intelligence benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
AA Intelligence Index	24.7	22.9	DeepSeek V4.1 Flash
Epoch Capabilities Index	155.9	146.0	DeepSeek V4.1 Flash

Agentic workLike-for-likePublic boards, shown as published, kept out of the index40

Agentic work benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
AA Agentic Index	Not measured	20.1	Only Nemotron 3 Ultra measured
LiveBench research	86.8%	Not measured	Only DeepSeek V4.1 Flash measured
LiveBench browser	84.0%	Not measured	Only DeepSeek V4.1 Flash measured
LiveBench long agentic	40.1%	Not measured	Only DeepSeek V4.1 Flash measured
SREBench (Vals AI)	0.8%	Not measured	Only DeepSeek V4.1 Flash measured
Finance Agent (Vals AI)	53.5%	37.7%	DeepSeek V4.1 Flash
Tax Agent Bench (Vals AI)	26.6%	Not measured	Only DeepSeek V4.1 Flash measured
Legal Research Bench (Vals AI)	41.4%	15.4%	DeepSeek V4.1 Flash
Excel Modeling Benchmark (Vals AI)	57.2%	31.7%	DeepSeek V4.1 Flash
BioMysteryBench (Vals AI)	67.8%	Not measured	Only DeepSeek V4.1 Flash measured
Terminal-Bench-Science (Vals AI)	0.0%	Not measured	Only DeepSeek V4.1 Flash measured
Vals Science Index	29.6%	Not measured	Only DeepSeek V4.1 Flash measured
τ²-Bench Telecom	Not measured	83.3%	Only Nemotron 3 Ultra measured
APEX-Agents	39.5%	22.7%	DeepSeek V4.1 Flash
MCP Atlas	Not measured	63.1%	Only Nemotron 3 Ultra measured
Neither model has a result on the other 27 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index60

Reasoning benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
GPQA Diamond	Not measured	86.1%	Only Nemotron 3 Ultra measured
LiveBench reasoning	86.7%	Not measured	Only DeepSeek V4.1 Flash measured
MysteryMechanism (Vals AI)	21.2%	Not measured	Only DeepSeek V4.1 Flash measured
GPQA Diamond (Artificial Analysis run)	Not measured	86.7%	Only Nemotron 3 Ultra measured
Humanity's Last Exam (Artificial Analysis run)	39.2%	28.4%	DeepSeek V4.1 Flash
GPQA Diamond (Epoch AI run)	89.8%	85.4%	DeepSeek V4.1 Flash
ARC-AGI	94.5%	Not measured	Only DeepSeek V4.1 Flash measured
ARC-AGI-2	72.9%	Not measured	Only DeepSeek V4.1 Flash measured
Chess puzzles	48.0%	Not measured	Only DeepSeek V4.1 Flash measured
Mystery game puzzles	43.0%	20.0%	DeepSeek V4.1 Flash
LMArena Text: hard prompts	1483	1452	DeepSeek V4.1 Flash
LMArena Text: expert	1501	1472	DeepSeek V4.1 Flash
LMArena Text: hard prompts in English	1488	1453	DeepSeek V4.1 Flash
LMArena Vision: diagrams	1297	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Vision: homework	1307	Not measured	Only DeepSeek V4.1 Flash measured
Neither model has a result on the other 8 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index40

Math benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
OTIS Mock AIME	98.3%	86.7%	DeepSeek V4.1 Flash
FrontierMath, tiers 1 to 3	67.4%	Not measured	Only DeepSeek V4.1 Flash measured
FrontierMath, tier 4	26.8%	Not measured	Only DeepSeek V4.1 Flash measured
ProofBench	54.0%	2.0%	DeepSeek V4.1 Flash
LMArena Text: math	1478	1457	DeepSeek V4.1 Flash
LMArena Text: mathematical work	1485	1461	DeepSeek V4.1 Flash
MathArena	42.3%	Not measured	Only DeepSeek V4.1 Flash measured
Neither model has a result on the other 7 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index51

Knowledge benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
MMLU Pro	Not measured	85.8%	Only Nemotron 3 Ultra measured
LegalBench (Vals AI)	83.3%	82.1%	DeepSeek V4.1 Flash
CorpFin (Vals AI)	Not measured	65.5%	Only Nemotron 3 Ultra measured
TaxEval (Vals AI)	Not measured	73.1%	Only Nemotron 3 Ultra measured
MedCode (Vals AI)	41.2%	38.6%	DeepSeek V4.1 Flash
SimpleQA Verified	42.9%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text: science	1469	1465	DeepSeek V4.1 Flash
LMArena Text: medicine and healthcare	1484	1456	DeepSeek V4.1 Flash
LMArena Text: legal and government	1443	1452	Nemotron 3 Ultra
LMArena Text: business and finance	1461	1434	DeepSeek V4.1 Flash
Neither model has a result on the other 10 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index80

Web design benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
Design Arena: websites	1308	1145	DeepSeek V4.1 Flash
Design Arena: UI components	1312	1135	DeepSeek V4.1 Flash
Design Arena: game dev	1330	1138	DeepSeek V4.1 Flash
Design Arena: data viz	1291	1141	DeepSeek V4.1 Flash
Design Arena: 3D	1355	1131	DeepSeek V4.1 Flash
Design Arena: all code categories	1319	1146	DeepSeek V4.1 Flash
Design Arena: SVG	1244	1069	DeepSeek V4.1 Flash
Design Arena: ASCII art	1265	1100	DeepSeek V4.1 Flash
LiveBench design	79.2%	Not measured	Only DeepSeek V4.1 Flash measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index163

General benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
LiveBench data analysis	79.3%	Not measured	Only DeepSeek V4.1 Flash measured
Public Benefits Bench (Vals AI)	64.3%	Not measured	Only DeepSeek V4.1 Flash measured
SAGE (Vals AI)	47.9%	Not measured	Only DeepSeek V4.1 Flash measured
MedScribe (Vals AI)	85.5%	Not measured	Only DeepSeek V4.1 Flash measured
IFBench	Not measured	81.4%	Only Nemotron 3 Ultra measured
Long context reasoning (AA-LCR)	84.0%	79.3%	DeepSeek V4.1 Flash
DTBench	89.9%	90.1%	Nemotron 3 Ultra
LMCA	47.0%	36.9%	DeepSeek V4.1 Flash
Surface Evolver Bench	46.3%	Not measured	Only DeepSeek V4.1 Flash measured
Furniture assembly	34.2%	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text	1464	1445	DeepSeek V4.1 Flash
LMArena Text: instruction following	1473	1418	DeepSeek V4.1 Flash
LMArena Text: creative writing	1437	1399	DeepSeek V4.1 Flash
LMArena Vision	1278	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text: English	1473	1455	DeepSeek V4.1 Flash
LMArena Text: non-English	1449	1427	DeepSeek V4.1 Flash
LMArena Text: Chinese	1501	1497	DeepSeek V4.1 Flash
LMArena Text: German	1470	1472	Nemotron 3 Ultra
LMArena Text: Japanese	1432	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Text: Korean	1436	1384	DeepSeek V4.1 Flash
LMArena Text: French	1465	1472	Nemotron 3 Ultra
LMArena Text: Spanish	1459	1455	DeepSeek V4.1 Flash
LMArena Text: Russian	1467	1417	DeepSeek V4.1 Flash
LMArena Text: Polish	1457	1385	DeepSeek V4.1 Flash
LMArena Text: multi-turn	1461	1411	DeepSeek V4.1 Flash
LMArena Text: longer queries	1473	1437	DeepSeek V4.1 Flash
LMArena Text: writing and language	1450	1406	DeepSeek V4.1 Flash
LMArena Text: entertainment and media	1445	1397	DeepSeek V4.1 Flash
LMArena Vision: English	1288	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Vision: Chinese	1327	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Vision: reading text	1282	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Vision: humor	1260	Not measured	Only DeepSeek V4.1 Flash measured
LMArena Vision: creative writing	1275	Not measured	Only DeepSeek V4.1 Flash measured
Neither model has a result on the other 15 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for DeepSeek V4.1 Flash and Nemotron 3 Ultra
Benchmark	DeepSeek V4.1 Flash	Nemotron 3 Ultra	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

DeepSeek V4.1 Flash$0.0006Fits in one request

Nemotron 3 Ultra$0.0018Fits in one request

DeepSeek V4.1 Flash costs less

Repository review

50K input + 3K output tokens

DeepSeek V4.1 Flash$0.013Fits in one request

Nemotron 3 Ultra$0.037Fits in one request

DeepSeek V4.1 Flash costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4.1 Flash$0.050Fits in one request

Nemotron 3 Ultra$0.144Fits in one request

DeepSeek V4.1 Flash costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of DeepSeek V4.1 Flash and Nemotron 3 Ultra
Specification	DeepSeek V4.1 Flash	NVIDIA Nemotron 3 Ultra
Maker	DeepSeek	NVIDIA
Weights	Open weights	Open weights
Released	September 10, 2026	June 4, 2026
Context window	1.05M	262K
Input $/Mtok	$0.21	$0.60
Output $/Mtok	$0.84	$2.40
Coding index	62.5	30.0
Independent measurements behind it	5	3
Cost per solved task	Not computable	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is DeepSeek V4.1 Flash better than Nemotron 3 Ultra for coding?

Pick DeepSeek V4.1 Flash for coding: it scores 62.5 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra. Pick Nemotron 3 Ultra for work measured by LMArena Text: legal and government or DTBench, where it leads.

Which is cheaper, DeepSeek V4.1 Flash or Nemotron 3 Ultra?

DeepSeek V4.1 Flash costs $0.21 per million input tokens and $0.84 per million output tokens; Nemotron 3 Ultra costs $0.60 and $2.40. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V4.1 Flash or Nemotron 3 Ultra?

DeepSeek V4.1 Flash, with 1.05M tokens against 262K.

How many benchmarks is the DeepSeek V4.1 Flash vs Nemotron 3 Ultra comparison based on?

57 benchmarks have a result for both models as of October 22, 2026. DeepSeek V4.1 Flash's coding index rests on 5 independent benchmarks and Nemotron 3 Ultra's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/deepseek-v4-1-flash-vs-nvidia-nemotron-3-ultra-550b-a55b" title="DeepSeek V4.1 Flash vs Nemotron 3 Ultra, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
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DeepSeek V4.1 Flash or Nemotron 3 Ultra: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Knowledge

Web design

Long documents

Everyday cost

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next