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  5. GPT-6 Luna ProvsNemotron 3.5 Content Safety
Updated Sep 2026

GPT-6 Luna ProvsNemotron 3.5 Content Safety

Nemotron 3.5 Content Safety is cheaper than GPT-6 Luna Pro at $0/M vs $0.1/M input tokens.

GPT-6 Luna Pro and Nemotron 3.5 Content Safety compared across 20 shared prompts
SpecGPT-6 Luna ProNemotron 3.5 Content Safety
Input price$0.1/M tokensFree
Output price$0.5/M tokensFree
Context window1.1M tokens128K tokens
WeightsClosedOpen
Free API (OpenRouter)NoYes (1 provider)
ReleasedSep 2026Jun 2026
Our Verdict
GPT-6 Luna Pro
GPT-6 Luna Pro
Nemotron 3.5 Content Safety
Nemotron 3.5 Content SafetyRunner-up

Not enough votes to call it. On the specs, GPT-6 Luna Pro has the edge: bigger model tier, newer, bigger context window, major provider backing.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-6 Luna Pro
Input
$0.10
Output
$0.50
Nemotron 3.5 Content Safety
Input
$0.000
Output
$0.000
Where to run it

3 hosts

GPT-6 Luna Pro2 hosts
HostInOutContextUptime
Azure AI Foundry$0.10 in·$0.50 out·1.1M·98.6% upOpenAI$0.10 in·$0.50 out·1.1M·99.9% up
Nemotron 3.5 Content Safety1 host
HostInOutContextUptime
NVIDIA$0 in·$0 out·128k·96.2% up

Per million tokens. Prices and uptime via OpenRouter, checked 25 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

GPT-6 Luna Pro is developed by OpenAI while Nemotron 3.5 Content Safety is developed by NVIDIA. GPT-6 Luna Pro has a 1.1M token context window vs Nemotron 3.5 Content Safety's 128K. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-6 Luna Pro and Nemotron 3.5 Content Safety each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

GPT-6 Luna Pro costs $0.1/M input tokens and Nemotron 3.5 Content Safety costs $0/M input tokens. Nemotron 3.5 Content Safety is $0.10/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of GPT-6 Luna Pro and Nemotron 3.5 Content Safety 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.

Keep exploring

More comparisons

Against the newest arrivals

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GPT-6 Luna Pro logoCommand A+ logo
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Nemotron 3.5 Content Safety vs Claude Opus 5.5Landed Sep 2026
GPT-6 Luna Pro logoGPT-6 Sol Pro logo
GPT-6 Luna Pro vs GPT-6 Sol ProLanded Sep 2026
Nemotron 3.5 Content Safety logoGPT-6 Luna logo
Nemotron 3.5 Content Safety vs GPT-6 LunaLanded Sep 2026

Same lab, same size, long tail

GPT-6 Luna Pro logoGPT-6 Luna logo
GPT-6 Luna Pro vs GPT-6 LunaSame lab
GPT-6 Luna Pro logoGPT-6 Sol logo
GPT-6 Luna Pro vs GPT-6 SolSame lab
Nemotron 3.5 Content Safety logoNemotron 3 Nano Omni (free) logo
Nemotron 3.5 Content Safety vs Nemotron 3 Nano Omni (free)Same lab
Nemotron 3.5 Content Safety logoNemotron 3.5 Lightning logo
Nemotron 3.5 Content Safety vs Nemotron 3.5 LightningSame lab
Nemotron 3.5 Content Safety logoGPT-5.2 Pro logo
Nemotron 3.5 Content Safety vs GPT-5.2 ProCross-provider
Nemotron 3.5 Content Safety logoGPT-5.3 Chat logo
Nemotron 3.5 Content Safety vs GPT-5.3 ChatCross-provider
Nemotron 3.5 Content Safety logoGPT-5.3-Codex logo
Nemotron 3.5 Content Safety vs GPT-5.3-CodexCross-provider
Nemotron 3.5 Content Safety logoGPT-5.4 logo
Nemotron 3.5 Content Safety vs GPT-5.4Cross-provider

Model pages

GPT-6 Luna Pro logo
GPT-6 Luna Pro20 outputs, specs and price
Nemotron 3.5 Content Safety logo
Nemotron 3.5 Content Safety58 outputs, specs and price
Rival
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Explore all of Rival

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