Model Comparison

GPT-5.1 Thinking vs Nemotron Nano 9B v2Which is better in 2026?

GPT-5.1 Thinking significantly outperforms across most benchmarks.

Verdict: GPT-5.1 Thinking vs Nemotron Nano 9B v2 — which is better?

GPT-5.1 Thinking (by OpenAI) and Nemotron Nano 9B v2 (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-5.1 Thinking outperforms in 2 benchmarks (AIME 2025, GPQA), while Nemotron Nano 9B v2 is better at 0 benchmarks. GPT-5.1 Thinking significantly outperforms across most benchmarks.

Choose GPT-5.1 Thinking if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Nov 2025

Choose Nemotron Nano 9B v2 if…

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

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT-5.1 Thinking outperforms in 2 benchmarks (AIME 2025, GPQA), while Nemotron Nano 9B v2 is better at 0 benchmarks.

GPT-5.1 Thinking significantly outperforms across most benchmarks.

Sat Jun 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.1 Thinking specifies input context (400,000 tokens). Only GPT-5.1 Thinking specifies output context (128,000 tokens).

OpenAI
GPT-5.1 Thinking
Input400,000 tokens
Output128,000 tokens
NVIDIA
Nemotron Nano 9B v2
Input- tokens
Output- tokens
Sat Jun 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.1 Thinking supports multimodal inputs, whereas Nemotron Nano 9B v2 does not.

GPT-5.1 Thinking can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.1 Thinking

Text
Images
Audio
Video

Nemotron Nano 9B v2

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.1 Thinking is licensed under a proprietary license, while Nemotron Nano 9B v2 uses NVIDIA Open Model License Agreement .

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

GPT-5.1 Thinking

Proprietary

Closed source

Nemotron Nano 9B v2

NVIDIA Open Model License Agreement

Open weights

Release Timeline

When each model was launched

GPT-5.1 Thinking was released on 2025-11-12, while Nemotron Nano 9B v2 was released on 2025-08-18.

GPT-5.1 Thinking is 3 months newer than Nemotron Nano 9B v2.

GPT-5.1 Thinking

Nov 12, 2025

7 months ago

2mo newer
Nemotron Nano 9B v2

Aug 18, 2025

10 months ago

Knowledge Cutoff

When training data ends

Nemotron Nano 9B v2 has a documented knowledge cutoff of 2024-09-01, while GPT-5.1 Thinking's cutoff date is not specified.

We can confirm Nemotron Nano 9B v2's training data extends to 2024-09-01, but cannot make a direct comparison without GPT-5.1 Thinking's cutoff date.

GPT-5.1 Thinking

—

Nemotron Nano 9B v2

Sep 2024

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs
Higher AIME 2025 score (94.0% vs 72.1%)
Higher GPQA score (88.1% vs 64.0%)
NVIDIA
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.1 Thinking and Nemotron Nano 9B v2 side-by-side, then vote on the output you prefer.

GPT-5.1 Thinking
✓ Preferred
Nemotron Nano 9B v2
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.1 Thinking
NVIDIA
Nemotron Nano 9B v2

FAQ

Common questions about GPT-5.1 Thinking vs Nemotron Nano 9B v2.

Which is better, GPT-5.1 Thinking or Nemotron Nano 9B v2?

GPT-5.1 Thinking significantly outperforms across most benchmarks. GPT-5.1 Thinking is made by OpenAI and Nemotron Nano 9B v2 is made by NVIDIA. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.1 Thinking compare to Nemotron Nano 9B v2 in benchmarks?

GPT-5.1 Thinking scores Tau2 Telecom: 95.6%, AIME 2025: 94.0%, BrowseComp Long Context 128k: 90.0%, GPQA: 88.1%, MMMU: 85.4%. Nemotron Nano 9B v2 scores MATH-500: 97.8%, IFEval: 90.3%, AIME 2025: 72.1%, LiveCodeBench: 71.1%, BFCL_v3_MultiTurn: 66.9%.

What are the context window sizes for GPT-5.1 Thinking and Nemotron Nano 9B v2?

GPT-5.1 Thinking supports 400K tokens and Nemotron Nano 9B v2 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-5.1 Thinking and Nemotron Nano 9B v2?

Key differences include multimodal support (yes vs no), licensing (Proprietary vs NVIDIA Open Model License Agreement ). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.1 Thinking and Nemotron Nano 9B v2?

GPT-5.1 Thinking is developed by OpenAI and Nemotron Nano 9B v2 is developed by NVIDIA.

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