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Nemotron 3.5 Content Safety (free)

NVIDIAReleased Jun 4, 2026Free

NVIDIA Nemotron 3.5 Content Safety is a compact 4B-parameter multimodal guardrail model from NVIDIA, fine-tuned from Google Gemma-3-4B. It moderates both inputs to and responses from LLMs and VLMs, accepting...

Try in playground
Context window
128K tokens
Max output
8K tokens
Input
text, image
Output
text
Tokenizer
Other
Released
Jun 4, 2026
Reasoning
optional

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
InputFreeFree
OutputFreeFree

Supported parameters

  • include_reasoning
  • max_tokens
  • reasoning
  • seed
  • temperature
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model nvidia/nemotron-3.5-content-safety:free.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nvidia/nemotron-3.5-content-safety:free",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="nvidia/nemotron-3.5-content-safety:free",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "nvidia/nemotron-3.5-content-safety:free",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Nemotron 3.5 Content Safety (free) cost via API?
Nemotron 3.5 Content Safety (free) is free through OpenKey while NVIDIA offers it at no charge. No fee applies to free models.
What is Nemotron 3.5 Content Safety (free)'s context window?
Nemotron 3.5 Content Safety (free) accepts up to 128K tokens of context and returns up to 8K tokens per request.
Is Nemotron 3.5 Content Safety (free) OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "nvidia/nemotron-3.5-content-safety:free" using any OpenAI SDK — only the base URL and API key change.
What inputs does Nemotron 3.5 Content Safety (free) support?
Nemotron 3.5 Content Safety (free) accepts text, image input and produces text output.

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