What is the difference between ChatGPT-4o (March 2025) and Nemotron 3 Ultra?

ChatGPT-4o (March 2025) is developed by OpenAI while Nemotron 3 Ultra is developed by NVIDIA. ChatGPT-4o (March 2025) has a 128K token context window vs Nemotron 3 Ultra's 1.0M. You can compare their actual outputs across 32 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or Nemotron 3 Ultra?

It depends on your use case. ChatGPT-4o (March 2025) and Nemotron 3 Ultra each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 32 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to Nemotron 3 Ultra?

ChatGPT-4o (March 2025) costs $5/M input tokens and Nemotron 3 Ultra costs $0/M input tokens. Nemotron 3 Ultra is $5.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare ChatGPT-4o (March 2025) and Nemotron 3 Ultra on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and Nemotron 3 Ultra across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Jun 2026

ChatGPT-4o (March 2025)vsNemotron 3 Ultra

Nemotron 3 Ultra is cheaper than ChatGPT-4o (March 2025) at $0/M vs $5/M input tokens.

ChatGPT-4o (March 2025) and Nemotron 3 Ultra compared across 32 shared prompts
Spec	ChatGPT-4o (March 2025)	Nemotron 3 Ultra
Input price	$5/M tokens	Free
Output price	$15/M tokens	Free
Context window	128K tokens	1.0M tokens
Weights	—	Open
Free API (OpenRouter)	No	Yes (1 provider)
Released	Mar 2025	Jun 2026