What is the difference between Grok 4 Fast (free) and Nemotron 3.5 Content Safety?

Grok 4 Fast (free) is developed by xAI while Nemotron 3.5 Content Safety is developed by NVIDIA. Grok 4 Fast (free) has a 2.0M token context window vs Nemotron 3.5 Content Safety's 128K. You can compare their actual outputs across 34 challenges on Rival to see how they differ in practice.

Which is better, Grok 4 Fast (free) or Nemotron 3.5 Content Safety?

It depends on your use case. Grok 4 Fast (free) and Nemotron 3.5 Content Safety each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 34 challenges so you can judge which fits your needs best.

How much does Grok 4 Fast (free) cost compared to Nemotron 3.5 Content Safety?

Grok 4 Fast (free) costs $0/M input tokens and Nemotron 3.5 Content Safety costs $0/M input tokens. Nemotron 3.5 Content Safety is $0.00/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 Grok 4 Fast (free) and Nemotron 3.5 Content Safety on Rival?

This page shows a side-by-side comparison of Grok 4 Fast (free) 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.

Updated Jun 2026

Grok 4 Fast (free)vsNemotron 3.5 Content Safety

Grok 4 Fast (free) has a larger context window than Nemotron 3.5 Content Safety (2.0M tokens vs 128K tokens).

Grok 4 Fast (free) and Nemotron 3.5 Content Safety compared across 34 shared prompts
Spec	Grok 4 Fast (free)	Nemotron 3.5 Content Safety
Input price	Free	Free
Output price	Free	Free
Context window	2.0M tokens	128K tokens
Weights	—	Open
Free API (OpenRouter)	No	Yes (1 provider)
Released	Sep 2025	Jun 2026

Our Verdict

Grok 4 Fast (free)

Nemotron 3.5 Content SafetyRunner-up

Not enough votes to call it. On the specs, Grok 4 Fast (free) has the edge: bigger model tier, bigger context window, major provider backing.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Grok 4 Fast (free)

Input

$0.000

Output

$0.000

Nemotron 3.5 Content Safety

Input

$0.000

Output

$0.000

Where to run it

1 host

Grok 4 Fast (free)

No hosts listed on OpenRouter.

Nemotron 3.5 Content Safety1 host

HostInOutContextUptime

NVIDIA$0 in$0 out128k94.6% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between Grok 4 Fast (free) and Nemotron 3.5 Content Safety?

Which is better, Grok 4 Fast (free) or Nemotron 3.5 Content Safety?

How much does Grok 4 Fast (free) cost compared to Nemotron 3.5 Content Safety?

How can I compare Grok 4 Fast (free) and Nemotron 3.5 Content Safety on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between Grok 4 Fast (free) and Nemotron 3.5 Content Safety?

Which is better, Grok 4 Fast (free) or Nemotron 3.5 Content Safety?

How much does Grok 4 Fast (free) cost compared to Nemotron 3.5 Content Safety?

How can I compare Grok 4 Fast (free) and Nemotron 3.5 Content Safety on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages