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LongCat-2.5 vs Nemotron 3 Ultra (550B A55B)

LongCat-2.5 leads the LLM Stats Score 50.0 to 35.7. LongCat-2.5 is 1.8x cheaper per token.

Meituan · NVIDIA · Updated for 2026

Which is better?

LongCat-2.5 leads the overall LLM Stats Score 50.0 to 35.7, ranking #20 overall.

In the 2 individual benchmarks reported for both models, LongCat-2.5 wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, LongCat-2.5 is roughly 1.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

LongCat-2.5 also accepts a larger context window (1,048,576 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 LongCat-2.5

  • overall performance matters — it scores 50.0 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 2 of 2 exact shared results
  • cost matters — it's about 1.8x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Nov 2026

Choose Nemotron 3 Ultra (550B A55B)

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

At a glance

The differences that matter most.

LongCat-2.5
Meituan
Nemotron 3 Ultra (550B A55B)
NVIDIA
Core performance indexes
LLM Stats Score
50.0
#20
35.7
#107
Reasoning
48.3
#21
35.0
#106
Coding
38.6
#27
20.0
#124
Agents
36.3
#23
11.8
#137
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$0.30 / M
$0.50 / M
Output price
$1.20 / M
$2.20 / M
Context window
1,048,576
262,144

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
LongCat-2.5
Nemotron 3 Ultra (550B A55B)
Math
37.2#37
36.0#44
Tool use
30.2#15
2.0#202
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

23 reported for LongCat-2.5 · 26 for Nemotron 3 Ultra (550B A55B)

2 shared

LongCat-2.5 outperforms in 2 benchmarks (BrowseComp, Terminal-Bench 2.1), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks.

LongCat-2.5 significantly outperforms across most benchmarks.

Thu Nov 05 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

LongCat-2.5 costs less

For input processing, LongCat-2.5 ($0.30/1M tokens) is 1.7x cheaper than Nemotron 3 Ultra (550B A55B) ($0.50/1M tokens).

For output processing, LongCat-2.5 ($1.20/1M tokens) is 1.8x cheaper than Nemotron 3 Ultra (550B A55B) ($2.20/1M tokens).

In conclusion, Nemotron 3 Ultra (550B A55B) is more expensive than LongCat-2.5.*

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

Lowest available price from all providers
Thu Nov 05 2026 • llm-stats.com
Meituan
LongCat-2.5
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input tokens$0.50
Output tokens$2.20
Best providerDeepinfra
Notice missing or incorrect data?

Model Size

Parameter count comparison

1050.0B diff

LongCat-2.5 has 1050.0B more parameters than Nemotron 3 Ultra (550B A55B), making it 190.9% larger.

Meituan
LongCat-2.5
1.6Tparameters
NVIDIA
Nemotron 3 Ultra (550B A55B)
550.0Bparameters
1600.0B
LongCat-2.5
550.0B
Nemotron 3 Ultra (550B A55B)

Context Window

Maximum input and output token capacity

LongCat-2.5 accepts 1,048,576 input tokens compared to Nemotron 3 Ultra (550B A55B)'s 262,144 tokens. Nemotron 3 Ultra (550B A55B) can generate longer responses up to 262,144 tokens, while LongCat-2.5 is limited to 131,072 tokens.

Meituan
LongCat-2.5
Input1,048,576 tokens
Output131,072 tokens
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input262,144 tokens
Output262,144 tokens
Thu Nov 05 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

LongCat-2.5 supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

LongCat-2.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

LongCat-2.5

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

Release Timeline

When each model was launched

LongCat-2.5 was released on 2026-11-01, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

LongCat-2.5 is 5 months newer than Nemotron 3 Ultra (550B A55B).

LongCat-2.5

Nov 1, 2026

4 days ago

5mo newer
Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

5 months ago

Knowledge Cutoff

When training data ends

Nemotron 3 Ultra (550B A55B) has a documented knowledge cutoff of 2025-09-30, while LongCat-2.5'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 LongCat-2.5's cutoff date.

LongCat-2.5

—

Nemotron 3 Ultra (550B A55B)

Sep 2025

Provider Availability

LongCat-2.5 is available from Meituan. Nemotron 3 Ultra (550B A55B) is available from DeepInfra.

LongCat-2.5

meituan logo
Meituan
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?

Judge for yourself.

Run your own prompts against LongCat-2.5 and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.

LongCat-2.5
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground

FAQ

Common questions about LongCat-2.5 vs Nemotron 3 Ultra (550B A55B).

Which is better, LongCat-2.5 or Nemotron 3 Ultra (550B A55B)?

LongCat-2.5 leads the LLM Stats Score 50.0 to 35.7. LongCat-2.5 is made by Meituan 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 LongCat-2.5 compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

LongCat-2.5 scores MathVision: 96.5%, BrowseComp: 91.9%, CharXiv-R: 90.2%, Terminal-Bench 2.1: 88.4%, Video-MME: 85.2%. Nemotron 3 Ultra (550B A55B) scores RULER: 94.7%, IMO-AnswerBench: 92.3%, PinchBench: 90.0%, LiveCodeBench v6: 89.0%, GPQA: 87.0%.

Is LongCat-2.5 cheaper than Nemotron 3 Ultra (550B A55B)?

LongCat-2.5 is 1.7x cheaper for input tokens. LongCat-2.5 costs $0.30/M input and $1.20/M output via meituan. Nemotron 3 Ultra (550B A55B) costs $0.50/M input and $2.20/M output via deepinfra.

What are the context window sizes for LongCat-2.5 and Nemotron 3 Ultra (550B A55B)?

LongCat-2.5 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 LongCat-2.5 and Nemotron 3 Ultra (550B A55B)?

Key differences include LLM Stats Score (50.0 vs 35.7), context window (1.0M vs 262K), input pricing ($0.30 vs $0.50/M), multimodal support (yes vs no), licensing (Unknown vs OpenMDW License v1.1). See the full comparison above for benchmark-by-benchmark results.

Who makes LongCat-2.5 and Nemotron 3 Ultra (550B A55B)?

LongCat-2.5 is developed by Meituan and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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