Model Comparison

GPT OSS 20B vs Llama 3.1 Nemotron 70B InstructWhich is better in 2026?

GPT OSS 20B significantly outperforms across most benchmarks.

Verdict: GPT OSS 20B vs Llama 3.1 Nemotron 70B Instruct — which is better?

GPT OSS 20B (by OpenAI) and Llama 3.1 Nemotron 70B Instruct (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 20B outperforms in 1 benchmarks (MMLU), while Llama 3.1 Nemotron 70B Instruct is better at 0 benchmarks. GPT OSS 20B significantly outperforms across most benchmarks.

Choose GPT OSS 20B 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 70B Instruct if…

  • you are already invested in the NVIDIA ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT OSS 20B outperforms in 1 benchmarks (MMLU), while Llama 3.1 Nemotron 70B Instruct is better at 0 benchmarks.

GPT OSS 20B significantly outperforms across most benchmarks.

Tue Jul 28 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

49.1B diff

Llama 3.1 Nemotron 70B Instruct has 49.1B more parameters than GPT OSS 20B, making it 234.9% larger.

OpenAI
GPT OSS 20B
20.9Bparameters
NVIDIA
Llama 3.1 Nemotron 70B Instruct
70.0Bparameters
20.9B
GPT OSS 20B
70.0B
Llama 3.1 Nemotron 70B Instruct

Context Window

Maximum input and output token capacity

Only GPT OSS 20B specifies input context (131,072 tokens). Only GPT OSS 20B specifies output context (32,768 tokens).

OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
NVIDIA
Llama 3.1 Nemotron 70B Instruct
Input- tokens
Output- tokens
Tue Jul 28 2026 • llm-stats.com

License

Usage and distribution terms

GPT OSS 20B is licensed under Apache 2.0, while Llama 3.1 Nemotron 70B Instruct uses Llama 3.1 Community License.

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

GPT OSS 20B

Apache 2.0

Open weights

Llama 3.1 Nemotron 70B Instruct

Llama 3.1 Community License

Open weights

Release Timeline

When each model was launched

GPT OSS 20B was released on 2025-08-05, while Llama 3.1 Nemotron 70B Instruct was released on 2024-10-01.

GPT OSS 20B is 10 months newer than Llama 3.1 Nemotron 70B Instruct.

GPT OSS 20B

Aug 5, 2025

11 months ago

10mo newer
Llama 3.1 Nemotron 70B Instruct

Oct 1, 2024

1.8 years ago

Knowledge Cutoff

When training data ends

Llama 3.1 Nemotron 70B Instruct has a documented knowledge cutoff of 2023-12-01, while GPT OSS 20B's cutoff date is not specified.

We can confirm Llama 3.1 Nemotron 70B Instruct's training data extends to 2023-12-01, but cannot make a direct comparison without GPT OSS 20B's cutoff date.

GPT OSS 20B

—

Llama 3.1 Nemotron 70B Instruct

Dec 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (131,072 tokens)
Higher MMLU score (85.3% vs 80.2%)
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 20B and Llama 3.1 Nemotron 70B Instruct side-by-side, then vote on the output you prefer.

GPT OSS 20B
✓ Preferred
Llama 3.1 Nemotron 70B Instruct
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT OSS 20B
NVIDIA
Llama 3.1 Nemotron 70B Instruct

FAQ

Common questions about GPT OSS 20B vs Llama 3.1 Nemotron 70B Instruct.

Which is better, GPT OSS 20B or Llama 3.1 Nemotron 70B Instruct?

GPT OSS 20B significantly outperforms across most benchmarks. GPT OSS 20B is made by OpenAI and Llama 3.1 Nemotron 70B Instruct is made by NVIDIA. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT OSS 20B compare to Llama 3.1 Nemotron 70B Instruct in benchmarks?

GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%. Llama 3.1 Nemotron 70B Instruct scores GSM8k: 91.4%, HellaSwag: 85.6%, Winogrande: 84.5%, GSM8K Chat: 81.9%, MMLU Chat: 80.6%.

What are the context window sizes for GPT OSS 20B and Llama 3.1 Nemotron 70B Instruct?

GPT OSS 20B supports 131K tokens and Llama 3.1 Nemotron 70B Instruct 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 20B and Llama 3.1 Nemotron 70B Instruct?

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 20B and Llama 3.1 Nemotron 70B Instruct?

GPT OSS 20B is developed by OpenAI and Llama 3.1 Nemotron 70B Instruct is developed by NVIDIA.

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