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DeepSeek-V4.1-Flash vs Nemotron 3 Ultra (550B A55B)

DeepSeek-V4.1-Flash leads the LLM Stats Score 51.8 to 36.3. DeepSeek-V4.1-Flash is 2.8x cheaper per token.

DeepSeek · NVIDIA · Updated for 2026

Which is better?

DeepSeek-V4.1-Flash leads the overall LLM Stats Score 51.8 to 36.3, ranking #13 overall.

In the 3 individual benchmarks reported for both models, DeepSeek-V4.1-Flash wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, DeepSeek-V4.1-Flash is roughly 2.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

DeepSeek-V4.1-Flash also accepts a larger context window (1,040,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose DeepSeek-V4.1-Flash

  • overall performance matters — it scores 51.8 and ranks #13 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 3 exact shared results
  • cost matters — it's about 2.8x cheaper per token
  • you process long inputs — it offers a 1,040,000 token context window
  • you want the most recent training data — it shipped Sep 2026

Choose Nemotron 3 Ultra (550B A55B)

  • you want predictable pricing at $0.50/M input and $2.20/M output

At a glance

The differences that matter most.

DeepSeek-V4.1-Flash
DeepSeek
Nemotron 3 Ultra (550B A55B)
NVIDIA
Core performance indexes
LLM Stats Score
51.8
#13
36.3
#79
Reasoning
48.9
#18
35.4
#82
Coding
44.2
#5
21.0
#93
Agents
41.1
#4
12.5
#101
Cost, coverage & limits
Benchmark wins
2 of 3
1 of 3
Input price
$0.22 / M
$0.50 / M
Output price
$0.66 / M
$2.20 / M
Context window
1,040,000
262,144

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
DeepSeek-V4.1-Flash
Nemotron 3 Ultra (550B A55B)
Math
35.2#43
36.4#39
Tool use
34.8#2
2.8#166
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

20 reported for DeepSeek-V4.1-Flash · 26 for Nemotron 3 Ultra (550B A55B)

3 shared

DeepSeek-V4.1-Flash outperforms in 2 benchmarks (GPQA, Terminal-Bench 2.1), while Nemotron 3 Ultra (550B A55B) is better at 1 benchmark (Humanity's Last Exam).

DeepSeek-V4.1-Flash shows notably better performance in the majority of benchmarks.

Sun Sep 20 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

DeepSeek-V4.1-Flash costs less

For input processing, DeepSeek-V4.1-Flash ($0.22/1M tokens) is 2.3x cheaper than Nemotron 3 Ultra (550B A55B) ($0.50/1M tokens).

For output processing, DeepSeek-V4.1-Flash ($0.66/1M tokens) is 3.3x cheaper than Nemotron 3 Ultra (550B A55B) ($2.20/1M tokens).

In conclusion, Nemotron 3 Ultra (550B A55B) is more expensive than DeepSeek-V4.1-Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun Sep 20 2026 • llm-stats.com
DeepSeek
DeepSeek-V4.1-Flash
Input tokens$0.22
Output tokens$0.66
Best providerFireworks
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input tokens$0.50
Output tokens$2.20
Best providerDeepinfra
Notice missing or incorrect data?Start an Issue→

Model Size

Parameter count comparison

213.2B diff

DeepSeek-V4.1-Flash has 213.2B more parameters than Nemotron 3 Ultra (550B A55B), making it 38.8% larger.

DeepSeek
DeepSeek-V4.1-Flash
763.2Bparameters
NVIDIA
Nemotron 3 Ultra (550B A55B)
550.0Bparameters
763.2B
DeepSeek-V4.1-Flash
550.0B
Nemotron 3 Ultra (550B A55B)

Context Window

Maximum input and output token capacity

DeepSeek-V4.1-Flash accepts 1,040,000 input tokens compared to Nemotron 3 Ultra (550B A55B)'s 262,144 tokens. DeepSeek-V4.1-Flash can generate longer responses up to 393,216 tokens, while Nemotron 3 Ultra (550B A55B) is limited to 262,144 tokens.

DeepSeek
DeepSeek-V4.1-Flash
Input1,040,000 tokens
Output393,216 tokens
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input262,144 tokens
Output262,144 tokens
Sun Sep 20 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

DeepSeek-V4.1-Flash supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

DeepSeek-V4.1-Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

DeepSeek-V4.1-Flash

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

DeepSeek-V4.1-Flash is licensed under MIT, while Nemotron 3 Ultra (550B A55B) uses OpenMDW License v1.1.

License differences may affect how you can use these models in commercial or open-source projects.

DeepSeek-V4.1-Flash

MIT

Open weights

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

DeepSeek-V4.1-Flash was released on 2026-09-10, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

DeepSeek-V4.1-Flash is 3 months newer than Nemotron 3 Ultra (550B A55B).

DeepSeek-V4.1-Flash

Sep 10, 2026

1 weeks ago

3mo newer
Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

3 months ago

Knowledge Cutoff

When training data ends

Nemotron 3 Ultra (550B A55B) has a documented knowledge cutoff of 2025-09-30, while DeepSeek-V4.1-Flash's cutoff date is not specified.

We can confirm Nemotron 3 Ultra (550B A55B)'s training data extends to 2025-09-30, but cannot make a direct comparison without DeepSeek-V4.1-Flash's cutoff date.

DeepSeek-V4.1-Flash

—

Nemotron 3 Ultra (550B A55B)

Sep 2025

Provider Availability

DeepSeek-V4.1-Flash is available from Fireworks, DeepInfra, DeepSeek, Novita. Nemotron 3 Ultra (550B A55B) is available from DeepInfra.

DeepSeek-V4.1-Flash

fireworks logo
Fireworks
Input Price:Input: $0.22/1MOutput Price:Output: $0.66/1M
deepinfra logo
Deepinfra
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
deepseek logo
DeepSeek
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
novita logo
Novita
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M

Nemotron 3 Ultra (550B A55B)

deepinfra logo
Deepinfra
Input Price:Input: $0.50/1MOutput Price:Output: $2.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against DeepSeek-V4.1-Flash and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.

DeepSeek-V4.1-Flash
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground

FAQ

Common questions about DeepSeek-V4.1-Flash vs Nemotron 3 Ultra (550B A55B).

Which is better, DeepSeek-V4.1-Flash or Nemotron 3 Ultra (550B A55B)?

DeepSeek-V4.1-Flash leads the LLM Stats Score 51.8 to 36.3. DeepSeek-V4.1-Flash is made by DeepSeek and Nemotron 3 Ultra (550B A55B) is made by NVIDIA. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does DeepSeek-V4.1-Flash compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

DeepSeek-V4.1-Flash scores CodeForces: 100.0%, GPQA: 90.9%, Terminal-Bench 2.1: 90.6%, BabyVision: 89.6%, CyberGym: 88.1%. Nemotron 3 Ultra (550B A55B) scores RULER: 94.7%, IMO-AnswerBench: 92.3%, PinchBench: 90.0%, LiveCodeBench v6: 89.0%, GPQA: 87.0%.

Is DeepSeek-V4.1-Flash cheaper than Nemotron 3 Ultra (550B A55B)?

DeepSeek-V4.1-Flash is 2.3x cheaper for input tokens. DeepSeek-V4.1-Flash costs $0.22/M input and $0.66/M output via fireworks. Nemotron 3 Ultra (550B A55B) costs $0.50/M input and $2.20/M output via deepinfra.

What are the context window sizes for DeepSeek-V4.1-Flash and Nemotron 3 Ultra (550B A55B)?

DeepSeek-V4.1-Flash supports 1.0M tokens and Nemotron 3 Ultra (550B A55B) supports 262K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between DeepSeek-V4.1-Flash and Nemotron 3 Ultra (550B A55B)?

Key differences include LLM Stats Score (51.8 vs 36.3), context window (1.0M vs 262K), input pricing ($0.22 vs $0.50/M), multimodal support (yes vs no), licensing (MIT vs OpenMDW License v1.1). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V4.1-Flash and Nemotron 3 Ultra (550B A55B)?

DeepSeek-V4.1-Flash is developed by DeepSeek and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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