What is the difference between GPT-4.5 and Nex-N2.5-Pro (free)?

GPT-4.5 is developed by OpenAI while Nex-N2.5-Pro (free) is developed by Nex AGI. GPT-4.5 has a 128K token context window vs Nex-N2.5-Pro (free)'s 262K. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or Nex-N2.5-Pro (free)?

It depends on your use case. GPT-4.5 and Nex-N2.5-Pro (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to Nex-N2.5-Pro (free)?

GPT-4.5 costs $75/M input tokens and Nex-N2.5-Pro (free) costs $0/M input tokens. Nex-N2.5-Pro (free) is $75.00/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 GPT-4.5 and Nex-N2.5-Pro (free) on Rival?

This page shows a side-by-side comparison of GPT-4.5 and Nex-N2.5-Pro (free) 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 Sep 2026

GPT-4.5vsNex-N2.5-Pro (free)

Nex-N2.5-Pro (free) is cheaper than GPT-4.5 at $0/M vs $75/M input tokens.

GPT-4.5 and Nex-N2.5-Pro (free) compared across 2 shared prompts
Spec	GPT-4.5	Nex-N2.5-Pro (free)
Input price	$75/M tokens	Free
Output price	$150/M tokens	Free
Context window	128K tokens	262K tokens
Free API (OpenRouter)	No	Yes (1 provider)
Released	Feb 2025	Sep 2026

Side by side

Same prompt, both answers

Opening lines from every prompt both answered. Formatting stripped, words untouched.

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

GPT-4.5322 words

Dish Title: "Ocean & Earth Symphony: Kombu-Cured Venison, Sea Urchin Custard, Black Garlic Soil, and Smoked Cherry Blossom Emulsion" Conceptual Narrative: This composition embodies the delicate interplay between land and sea, exploring the subtle yet profound connection between umami-rich sea elements and earthy forest…

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Nex-N2.5-Pro (free)1,665 words

Dish: “Tidewater Orchard” Langoustine · Mirabelle Plum · Juniper · Kombu · Rye A tasting-menu course built around an unusual pairing: sweet cold-water langoustine with mirabelle plum, bridged by kombu umami, juniper resin, green tomato acidity, and toasted rye bitterness.

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Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

GPT-4.5153 words

Sweet Cinnamon Sugar Swirls Ingredients: 1 sheet puff pastry, thawed 1/4 cup granulated sugar 1 tablespoon cinnamon 2 tablespoons melted butter Pinch of salt 1 teaspoon vanilla extract Powdered sugar (optional for dusting) Prep Time: 10 minutes Cook Time: 15 minutes Total Time: 25 minutes Instructions: Preheat your…

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Nex-N2.5-Pro (free)119 words

Pantry Moon Bars A sweet, chewy peanut butter–chocolate oat treat made with only 7 pantry staples. Ingredients Rolled oats Creamy peanut butter Honey Chocolate chips Vanilla extract Ground cinnamon Salt Instructions Heat oven to 350°F / 175°C. Line an 8-inch square pan with parchment paper.

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Our Verdict

GPT-4.5

Nex-N2.5-Pro (free)

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

API pricing

Cost per 1M tokens

GPT-4.5

Input

$75.00

Output

$150.00

Nex-N2.5-Pro (free)

Input

$0.000

Output

$0.000

Where to run it

1 host

GPT-4.5

No hosts listed on OpenRouter.

Nex-N2.5-Pro (free)1 host

HostInOutContextUptime

Nex AGIfp8degraded$0 in$0 out262k99.2% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Same prompt, both answers

Michelin Star Recipe Design

Simple 7-Ingredient Recipe

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between GPT-4.5 and Nex-N2.5-Pro (free)?

Which is better, GPT-4.5 or Nex-N2.5-Pro (free)?

How much does GPT-4.5 cost compared to Nex-N2.5-Pro (free)?

How can I compare GPT-4.5 and Nex-N2.5-Pro (free) on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Same prompt, both answers

Michelin Star Recipe Design

Simple 7-Ingredient Recipe

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between GPT-4.5 and Nex-N2.5-Pro (free)?

Which is better, GPT-4.5 or Nex-N2.5-Pro (free)?

How much does GPT-4.5 cost compared to Nex-N2.5-Pro (free)?

How can I compare GPT-4.5 and Nex-N2.5-Pro (free) on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages