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Nemotron 3 Ultra (550B A55B) vs Seed 2.1 Pro

Seed 2.1 Pro leads the LLM Stats Score 47.0 to 37.0.

NVIDIA · ByteDance · Updated for 2026

Which is better?

Seed 2.1 Pro leads the overall LLM Stats Score 47.0 to 37.0, ranking #20 overall.

In the 5 individual benchmarks reported for both models, Seed 2.1 Pro wins 5; this is a narrower head-to-head signal than the composite indexes.

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

Choose Nemotron 3 Ultra (550B A55B)

  • you need open weights you can self-host or fine-tune

Choose Seed 2.1 Pro

  • overall performance matters — it scores 47.0 and ranks #20 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 5 of 5 exact shared results
  • you want the most recent training data — it shipped Jun 2026

At a glance

The differences that matter most.

Nemotron 3 Ultra (550B A55B)
NVIDIA
Seed 2.1 Pro
ByteDance
Core performance indexes
LLM Stats Score
37.0
#63
47.0
#20
Reasoning
36.3
#67
47.9
#18
Coding
22.1
#72
36.0
#25
Agents
13.4
#86
33.1
#22
Cost, coverage & limits
Benchmark wins
0 of 5
5 of 5
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
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Capability indexes

Additional strengths measured across groups of related public benchmarks

5 shared
Index
Nemotron 3 Ultra (550B A55B)
Seed 2.1 Pro
Math
36.4#37
39.8#15
Tool use
7.4#132
27.9#17
Long context
23.6#18
30.5#4
Finance
28.8#27
33.9#7
Legal
33.0#11
34.6#7
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

26 reported for Nemotron 3 Ultra (550B A55B) · 94 for Seed 2.1 Pro

5 shared

Nemotron 3 Ultra (550B A55B) outperforms in 0 benchmarks, while Seed 2.1 Pro is better at 5 benchmarks (BrowseComp, GDPval, Humanity's Last Exam, SciCode, Terminal-Bench 2.1).

Seed 2.1 Pro significantly outperforms across most benchmarks.

Fri Aug 28 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Input capabilities

Documented input modalities across available providers

Seed 2.1 Pro supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

Seed 2.1 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

Seed 2.1 Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Nemotron 3 Ultra (550B A55B) is licensed under OpenMDW License v1.1, while Seed 2.1 Pro uses a proprietary license.

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

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Seed 2.1 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Nemotron 3 Ultra (550B A55B) was released on 2026-06-04, while Seed 2.1 Pro was released on 2026-06-24.

Seed 2.1 Pro is 1 month newer than Nemotron 3 Ultra (550B A55B).

Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

2 months ago

Seed 2.1 Pro

Jun 24, 2026

2 months ago

2w newer

Knowledge Cutoff

When training data ends

Nemotron 3 Ultra (550B A55B) has a documented knowledge cutoff of 2025-09-30, while Seed 2.1 Pro'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 Seed 2.1 Pro's cutoff date.

Nemotron 3 Ultra (550B A55B)

Sep 2025

Seed 2.1 Pro

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Nemotron 3 Ultra (550B A55B) and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

Nemotron 3 Ultra (550B A55B)
✓ Preferred
Seed 2.1 Pro
Open in Playground

FAQ

Common questions about Nemotron 3 Ultra (550B A55B) vs Seed 2.1 Pro.

Which is better, Nemotron 3 Ultra (550B A55B) or Seed 2.1 Pro?

Seed 2.1 Pro leads the LLM Stats Score 47.0 to 37.0. Nemotron 3 Ultra (550B A55B) is made by NVIDIA and Seed 2.1 Pro is made by ByteDance. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Nemotron 3 Ultra (550B A55B) compare to Seed 2.1 Pro in benchmarks?

Nemotron 3 Ultra (550B A55B) scores RULER: 94.7%, IMO-AnswerBench: 92.3%, PinchBench: 90.0%, LiveCodeBench v6: 89.0%, GPQA: 87.0%. Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%.

What are the main differences between Nemotron 3 Ultra (550B A55B) and Seed 2.1 Pro?

Key differences include LLM Stats Score (37.0 vs 47.0), multimodal support (no vs yes), licensing (OpenMDW License v1.1 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Nemotron 3 Ultra (550B A55B) and Seed 2.1 Pro?

Nemotron 3 Ultra (550B A55B) is developed by NVIDIA and Seed 2.1 Pro is developed by ByteDance.

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