GPT-5 High vs Nemotron 3 Ultra (550B A55B)
GPT-5 High and Nemotron 3 Ultra (550B A55B) are closely matched at 34.0 and 36.3 on the LLM Stats Score. Nemotron 3 Ultra (550B A55B) is 3.7x cheaper per token.
OpenAI · NVIDIA · Updated for 2026
Which is better?
GPT-5 High and Nemotron 3 Ultra (550B A55B) are closely matched on the overall LLM Stats Score at 34.0 and 36.3.
In the 1 individual benchmarks reported for both models, GPT-5 High wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Nemotron 3 Ultra (550B A55B) is roughly 3.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5 High also accepts a larger context window (400,000 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 GPT-5 High
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you process long inputs — it offers a 400,000 token context window
Choose Nemotron 3 Ultra (550B A55B)
- cost matters — it's about 3.7x cheaper per token
- you want the most recent training data — it shipped Jun 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
2 reported for GPT-5 High · 26 for Nemotron 3 Ultra (550B A55B)
GPT-5 High outperforms in 1 benchmarks (GPQA), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks.
GPT-5 High significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5 High ($1.25/1M tokens) is 2.5x more expensive than Nemotron 3 Ultra (550B A55B) ($0.50/1M tokens).
For output processing, GPT-5 High ($10.00/1M tokens) is 4.5x more expensive than Nemotron 3 Ultra (550B A55B) ($2.20/1M tokens).
In conclusion, GPT-5 High is more expensive than Nemotron 3 Ultra (550B A55B).*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5 High accepts 400,000 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 GPT-5 High is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
GPT-5 High supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.
GPT-5 High can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-5 High
Nemotron 3 Ultra (550B A55B)
License
Usage and distribution terms
GPT-5 High is licensed under a proprietary license, while Nemotron 3 Ultra (550B A55B) uses OpenMDW License v1.1.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
OpenMDW License v1.1
Open weights
Release Timeline
When each model was launched
GPT-5 High was released on 2025-08-07, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.
Nemotron 3 Ultra (550B A55B) is 10 months newer than GPT-5 High.
Aug 7, 2025
1.1 years ago
Jun 4, 2026
3 months ago
10mo newerKnowledge Cutoff
When training data ends
GPT-5 High has a knowledge cutoff of 2024-09-30, while Nemotron 3 Ultra (550B A55B) has a cutoff of 2025-09-30.
Nemotron 3 Ultra (550B A55B) has more recent training data (up to 2025-09-30), making it potentially better informed about events through that date compared to GPT-5 High (2024-09-30).
Sep 2024
Sep 2025
1 yr newerProvider Availability
GPT-5 High is available from OpenAI. Nemotron 3 Ultra (550B A55B) is available from DeepInfra.
GPT-5 High
Nemotron 3 Ultra (550B A55B)
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5 High and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5 High vs Nemotron 3 Ultra (550B A55B).