Nex-N2.5-Pro (free) vs 
OpenAI o4-mini
Nex-N2.5-Pro (free) is cheaper than OpenAI o4-mini at $0/M vs $1.1/M input tokens.
Written rounds
9 promptsSeven pantry ingredients, one dish, and a name worth saying out loud.
One month, three habits, someone starting from nothing.
Three-star dish, one unusual pairing, plating described in full.
A consulting contract with traps in it. Find them, then fix them.
A pitch deck for a brainwave keyboard. The 94% accuracy claim is doing a lot.
A collaborative editor that syncs on client clocks. Find what breaks first.
The transistor arrives in 1920. Trace it forward to 1980, second-order effects included.
You are the CEO. The drug has a side effect nobody reported. The board meets in 48 hours.
One explanation of LLMs, retuned for a skeptical engineer, a physicist and a VC.
Favorites
Movie
Album
Book
City
Game
Nex-N2.5-Pro (free)Nex-N2.5-Pro (free)
Blade Runner 2049
Kind of Blue
Мастер и Маргарита
Tokyo
The Legend of Zelda: Breath of the Wild
OpenAI o4-miniOpenAI o4-mini
No pick
No pick
No pick
No pick
The Shawshank Redemption
No pick
No pick
No pick
No pick
Price and specs
Not enough votes to call it. On the specs, Nex-N2.5-Pro (free) has the edge: bigger model tier, newer, bigger context window.
| Spec | Nex-N2.5-Pro (free) | OpenAI o4-mini |
|---|---|---|
| Input price | Free | $1.1/M tokens |
| Output price | Free | $4.4/M tokens |
| Context window | 262K tokens | — |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Apr 2025 |
| At 10M a month | $0 | $11.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Nex-N2.5-Pro (free)
No hosts listed on OpenRouter.
OpenAI o4-mini1 host
Per million tokens. Prices and uptime via OpenRouter, checked 11 Oct 2026.
Common questions
What is the difference between Nex-N2.5-Pro (free) and OpenAI o4-mini?
Nex-N2.5-Pro (free) is developed by Nex AGI while OpenAI o4-mini is developed by OpenAI. You can compare their actual outputs across 14 challenges on Rival to see how they differ in practice.
Which is better, Nex-N2.5-Pro (free) or OpenAI o4-mini?
It depends on your use case. Nex-N2.5-Pro (free) and OpenAI o4-mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 14 challenges so you can judge which fits your needs best.
How much does Nex-N2.5-Pro (free) cost compared to OpenAI o4-mini?
Nex-N2.5-Pro (free) costs $0/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. Nex-N2.5-Pro (free) is $1.10/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 Nex-N2.5-Pro (free) and OpenAI o4-mini on Rival?
This page shows a side-by-side comparison of Nex-N2.5-Pro (free) and OpenAI o4-mini 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.
More comparisons
Against the newest arrivals
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- Nex-N2.5-Pro (free) vs Solar Mini 4Landed Sep 2026
- OpenAI o4-mini vs Qwen3.8 Max PrimeLanded Sep 2026
Same lab, same size, long tail
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- Nex-N2.5-Pro (free) vs Ox AlphaSame size
- OpenAI o4-mini vs OpenAI o3Version compare
- OpenAI o4-mini vs GPT-6.1 SolSame lab
- Nex-N2.5-Pro (free) vs Mercury 2New provider
- OpenAI o4-mini vs Mercury 2.5New provider
- Nex-N2.5-Pro (free) vs Mercury 2.5 PreviewNew provider
- Nex-N2.5-Pro (free) vs MiMo-V2-FlashNew provider
