Model Comparison

GPT OSS 120B vs Llama 3.1 Nemotron Ultra 253B v1Which is better in 2026?

GPT OSS 120B significantly outperforms across most benchmarks.

Verdict: GPT OSS 120B vs Llama 3.1 Nemotron Ultra 253B v1 — which is better?

GPT OSS 120B (by OpenAI) and Llama 3.1 Nemotron Ultra 253B v1 (by NVIDIA) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

GPT OSS 120B outperforms in 1 benchmarks (GPQA), while Llama 3.1 Nemotron Ultra 253B v1 is better at 0 benchmarks. GPT OSS 120B significantly outperforms across most benchmarks.

Choose GPT OSS 120B if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Aug 2025

Choose Llama 3.1 Nemotron Ultra 253B v1 if…

  • you are already invested in the NVIDIA ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT OSS 120B outperforms in 1 benchmarks (GPQA), while Llama 3.1 Nemotron Ultra 253B v1 is better at 0 benchmarks.

GPT OSS 120B significantly outperforms across most benchmarks.

Sat Jul 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

136.2B diff

Llama 3.1 Nemotron Ultra 253B v1 has 136.2B more parameters than GPT OSS 120B, making it 116.6% larger.

OpenAI
GPT OSS 120B
116.8Bparameters
NVIDIA
Llama 3.1 Nemotron Ultra 253B v1
253.0Bparameters
116.8B
GPT OSS 120B
253.0B
Llama 3.1 Nemotron Ultra 253B v1

Context Window

Maximum input and output token capacity

Only GPT OSS 120B specifies input context (131,072 tokens). Only GPT OSS 120B specifies output context (131,072 tokens).

OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
NVIDIA
Llama 3.1 Nemotron Ultra 253B v1
Input- tokens
Output- tokens
Sat Jul 18 2026 • llm-stats.com

License

Usage and distribution terms

GPT OSS 120B is licensed under Apache 2.0, while Llama 3.1 Nemotron Ultra 253B v1 uses Llama 3.1 Community License.

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

GPT OSS 120B

Apache 2.0

Open weights

Llama 3.1 Nemotron Ultra 253B v1

Llama 3.1 Community License

Open weights

Release Timeline

When each model was launched

GPT OSS 120B was released on 2025-08-05, while Llama 3.1 Nemotron Ultra 253B v1 was released on 2025-04-07.

GPT OSS 120B is 4 months newer than Llama 3.1 Nemotron Ultra 253B v1.

GPT OSS 120B

Aug 5, 2025

11 months ago

4mo newer
Llama 3.1 Nemotron Ultra 253B v1

Apr 7, 2025

1.3 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 GPT OSS 120B'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 GPT OSS 120B's cutoff date.

GPT OSS 120B

—

Llama 3.1 Nemotron Ultra 253B v1

Dec 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (131,072 tokens)
Higher GPQA score (80.1% vs 76.0%)
NVIDIA

No standout differentiators in the data we have for this pair.

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT OSS 120B and Llama 3.1 Nemotron Ultra 253B v1 side-by-side, then vote on the output you prefer.

GPT OSS 120B
✓ Preferred
Llama 3.1 Nemotron Ultra 253B v1
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT OSS 120B
NVIDIA
Llama 3.1 Nemotron Ultra 253B v1

FAQ

Common questions about GPT OSS 120B vs Llama 3.1 Nemotron Ultra 253B v1.

Which is better, GPT OSS 120B or Llama 3.1 Nemotron Ultra 253B v1?

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is made by OpenAI and Llama 3.1 Nemotron Ultra 253B v1 is made by NVIDIA. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT OSS 120B compare to Llama 3.1 Nemotron Ultra 253B v1 in benchmarks?

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%. 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 GPT OSS 120B and Llama 3.1 Nemotron Ultra 253B v1?

GPT OSS 120B supports 131K 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 GPT OSS 120B and Llama 3.1 Nemotron Ultra 253B v1?

Key differences include licensing (Apache 2.0 vs Llama 3.1 Community License). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT OSS 120B and Llama 3.1 Nemotron Ultra 253B v1?

GPT OSS 120B is developed by OpenAI and Llama 3.1 Nemotron Ultra 253B v1 is developed by NVIDIA.

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