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Kimi K3.1 Pro vs Llama 3.1 Nemotron Ultra 253B v1

Kimi K3.1 Pro leads the LLM Stats Score 55.5 to 18.5.

Moonshot AI · NVIDIA · Updated for 2026

Which is better?

Kimi K3.1 Pro leads the overall LLM Stats Score 55.5 to 18.5, ranking #5 overall.

In the 1 individual benchmarks reported for both models, Kimi K3.1 Pro wins 1; 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 Kimi K3.1 Pro

  • overall performance matters — it scores 55.5 and ranks #5 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Oct 2026

Choose Llama 3.1 Nemotron Ultra 253B v1

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

At a glance

The differences that matter most.

Kimi K3.1 Pro
Moonshot AI
Llama 3.1 Nemotron Ultra 253B v1
NVIDIA
Core performance indexes
LLM Stats Score
55.5
#5
18.5
#242
Reasoning
54.3
#6
18.2
#240
Coding
42.7
#9
12.3
#174
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,048,576
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Kimi K3.1 Pro
Llama 3.1 Nemotron Ultra 253B v1
Math
38.6#26
15.6#229
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

30 reported for Kimi K3.1 Pro · 6 for Llama 3.1 Nemotron Ultra 253B v1

1 shared

Kimi K3.1 Pro outperforms in 1 benchmarks (GPQA), while Llama 3.1 Nemotron Ultra 253B v1 is better at 0 benchmarks.

Kimi K3.1 Pro significantly outperforms across most benchmarks.

Sat Oct 31 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Kimi K3.1 Pro specifies input context (1,048,576 tokens). Only Kimi K3.1 Pro specifies output context (1,048,576 tokens).

Moonshot AI
Kimi K3.1 Pro
Input1,048,576 tokens
Output1,048,576 tokens
NVIDIA
Llama 3.1 Nemotron Ultra 253B v1
Input- tokens
Output- tokens
Sat Oct 31 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Kimi K3.1 Pro supports multimodal inputs, whereas Llama 3.1 Nemotron Ultra 253B v1 does not.

Kimi K3.1 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Kimi K3.1 Pro

Text
Images
Audio
Video

Llama 3.1 Nemotron Ultra 253B v1

Text
Images
Audio
Video

Release Timeline

When each model was launched

Kimi K3.1 Pro was released on 2026-10-23, while Llama 3.1 Nemotron Ultra 253B v1 was released on 2025-04-07.

Kimi K3.1 Pro is 19 months newer than Llama 3.1 Nemotron Ultra 253B v1.

Kimi K3.1 Pro

Oct 23, 2026

1 weeks ago

1.5yr newer
Llama 3.1 Nemotron Ultra 253B v1

Apr 7, 2025

1.6 years ago

Knowledge Cutoff

When training data ends

Llama 3.1 Nemotron Ultra 253B v1 has a documented knowledge cutoff of 2023-12-01, while Kimi K3.1 Pro's cutoff date is not specified.

We can confirm Llama 3.1 Nemotron Ultra 253B v1's training data extends to 2023-12-01, but cannot make a direct comparison without Kimi K3.1 Pro's cutoff date.

Kimi K3.1 Pro

—

Llama 3.1 Nemotron Ultra 253B v1

Dec 2023

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Kimi K3.1 Pro and Llama 3.1 Nemotron Ultra 253B v1 side-by-side, then vote on the output you prefer.

Kimi K3.1 Pro
✓ Preferred
Llama 3.1 Nemotron Ultra 253B v1
Open in Playground

FAQ

Common questions about Kimi K3.1 Pro vs Llama 3.1 Nemotron Ultra 253B v1.

Which is better, Kimi K3.1 Pro or Llama 3.1 Nemotron Ultra 253B v1?

Kimi K3.1 Pro leads the LLM Stats Score 55.5 to 18.5. Kimi K3.1 Pro is made by Moonshot AI and Llama 3.1 Nemotron Ultra 253B v1 is made by NVIDIA. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Kimi K3.1 Pro compare to Llama 3.1 Nemotron Ultra 253B v1 in benchmarks?

Kimi K3.1 Pro scores BabyVision: 95.4%, GPQA: 94.2%, BenchCAD (with Python tool): 92.7%, BrowseComp: 92.1%, Chartography: 90.2%. Llama 3.1 Nemotron Ultra 253B v1 scores MATH-500: 97.0%, IFEval: 89.5%, GPQA: 76.0%, BFCL v2: 74.1%, AIME 2025: 72.5%.

What are the context window sizes for Kimi K3.1 Pro and Llama 3.1 Nemotron Ultra 253B v1?

Kimi K3.1 Pro supports 1.0M tokens and Llama 3.1 Nemotron Ultra 253B v1 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K3.1 Pro and Llama 3.1 Nemotron Ultra 253B v1?

Key differences include LLM Stats Score (55.5 vs 18.5), multimodal support (yes vs no), licensing (Unknown vs Llama 3.1 Community License). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K3.1 Pro and Llama 3.1 Nemotron Ultra 253B v1?

Kimi K3.1 Pro is developed by Moonshot AI and Llama 3.1 Nemotron Ultra 253B v1 is developed by NVIDIA.

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