modelparams.dev
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Providers

Alibaba Anthropic Cohere DeepSeek Google Meta MiniMax Mistral Moonshot AI Nvidia OpenAI Perplexity xAI Xiaomi Z.ai

Providers

Alibaba Anthropic Cohere DeepSeek Google Meta MiniMax Mistral Moonshot AI Nvidia OpenAI Perplexity xAI Xiaomi Z.ai
Nvidia Subscription 6 params

Nvidia Nemotron 3 Ultra (subscription) parameters

These are the parameters modelparams.dev tracks for Nvidia Nemotron 3 Ultra when you reach it through a subscription rather than an API key. Each row gives the type, default, valid range or values, and the conditions that gate it. It's the same data the JSON API serves.

Length 2 params
Parameter Type Default Description Condition
Max tokens
max_tokens 		integer (1…32768) 16384 Maximum number of tokens to generate. Generation stops when this limit is reached. —
Stop
stop 		string — A string or list of strings where the API will stop generating further tokens. The returned text will not contain the stop sequence. —
Sampling 2 params
Parameter Type Default Description Condition
Temperature
temperature 		number (-∞…1) 1 Controls randomness. Lower values make outputs more focused; higher values make them more varied. Not recommended to modify both temperature and top_p in the same call. —
Top P
top_p 		number (-∞…1) 0.95 Controls nucleus sampling by limiting generation to tokens within the selected cumulative probability. Not recommended to modify both temperature and top_p in the same call. —
Reasoning 2 params
Parameter Type Default Description Condition
Reasoning effort
reasoning_effort 		enum (none | medium | high) "high" Controls the reasoning mode. 'none' disables reasoning tokens, 'medium' enables efficient reasoning, and 'high' enables full reasoning. —
Reasoning budget
reasoning_budget 		integer (-1…32768) 16384 Maximum number of tokens the model may use for internal reasoning before being forced to end the reasoning trace. Use -1 to disable budget enforcement. —

Resources

All Nvidia models Glossary Full catalog

Nemotron 3 Ultra — JSON

The full model definition as served by the API. Copy it or open the endpoint directly.

/api/v1/models/nvidia/nemotron-3-ultra-subscription.json 
{
  "$schema": "https://modelparams.dev/api/v1/schema.json",
  "provider": "nvidia",
  "authType": "subscription",
  "model": "nemotron-3-ultra",
  "params": [
    {
      "path": "temperature",
      "label": "Temperature",
      "description": "Controls randomness. Lower values make outputs more focused; higher values make them more varied. Not recommended to modify both temperature and top_p in the same call.",
      "group": "sampling",
      "type": "number",
      "default": 1,
      "range": {
        "max": 1
      }
    },
    {
      "path": "top_p",
      "label": "Top P",
      "description": "Controls nucleus sampling by limiting generation to tokens within the selected cumulative probability. Not recommended to modify both temperature and top_p in the same call.",
      "group": "sampling",
      "type": "number",
      "default": 0.95,
      "range": {
        "max": 1
      }
    },
    {
      "path": "max_tokens",
      "label": "Max tokens",
      "description": "Maximum number of tokens to generate. Generation stops when this limit is reached.",
      "group": "generation_length",
      "type": "integer",
      "default": 16384,
      "range": {
        "min": 1,
        "max": 32768
      }
    },
    {
      "path": "reasoning_effort",
      "label": "Reasoning effort",
      "description": "Controls the reasoning mode. 'none' disables reasoning tokens, 'medium' enables efficient reasoning, and 'high' enables full reasoning.",
      "group": "reasoning",
      "type": "enum",
      "default": "high",
      "values": [
        "none",
        "medium",
        "high"
      ]
    },
    {
      "path": "reasoning_budget",
      "label": "Reasoning budget",
      "description": "Maximum number of tokens the model may use for internal reasoning before being forced to end the reasoning trace. Use -1 to disable budget enforcement.",
      "group": "reasoning",
      "type": "integer",
      "default": 16384,
      "range": {
        "min": -1,
        "max": 32768
      }
    },
    {
      "path": "stop",
      "label": "Stop",
      "description": "A string or list of strings where the API will stop generating further tokens. The returned text will not contain the stop sequence.",
      "group": "generation_length",
      "type": "string"
    }
  ]
}

Other Nvidia models

Gliner Pii 4 params View Llama 3.1 Nemoguard 8b Topic Control 6 params View Llama 3.1 Nemotron Nano 8b V1 7 params View Llama 3.1 Nemotron Safety Guard 8b V3 1 param View Llama 3.1 Nemotron Ultra 253b V1 7 params View Llama 3.3 Nemotron Super 49b V1 7 params View Llama 3.3 Nemotron Super 49b V1.5 7 params View Nemoguard Jailbreak Detect 0 params View Nemotron 3 Nano 30b A3b 5 params View Nemotron 3 Super 120b A12b 7 params View Nemotron 3 Ultra 550b A55b 7 params View Nemotron Content Safety Reasoning 4b 5 params View Nemotron Mini 4b Instruct 6 params View Riva Translate 4b Instruct V1.1 6 params View Usdcode Llama 3.1 70b Instruct 4 params View

How to use

Building with an AI agent? Hit Copy to grab this whole guide as Markdown and paste it in — or point your agent straight at /llms.txt.

modelparams.dev is an open, community-maintained catalog of LLM model parameters. Each entry shows the knobs you can turn — type, default, range, and the conditions that gate it.

The same model accessed via an API key and via a subscription usually exposes a different set of parameters. We list both as separate entries so the data stays honest.

Catalog API

The full catalog is static JSON, CORS-enabled, served from the edge.

curl https://modelparams.dev/api/v1/models.json

Each entry is keyed by provider/model for API-key variants; subscription variants append -subscription.

If you only need the params for one model contract, use the providerless endpoint. Subscription contracts are model slugs with -subscription. 

curl https://modelparams.dev/api/v1/params/gpt-5.5.json
curl https://modelparams.dev/api/v1/params/gpt-5.5-subscription.json

Single model

curl https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-7.json
curl https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-7-subscription.json

JSON Schema

Every entry validates against a JSON Schema you can use in your editor or pipeline. 

curl https://modelparams.dev/api/v1/schema.json

Add this header to any YAML you author for autocomplete in VS Code: 

# yaml-language-server: $schema=https://modelparams.dev/api/v1/schema.json

Logos

Provider logos are available at /assets/logos/{provider}.svg where {provider} is the provider slug. They use currentColor so they inherit your text color. 

curl https://modelparams.dev/assets/logos/anthropic.svg

Logos are sourced from the models.dev repo (MIT) and used under nominative fair use.

Contribute

The data lives in YAML under models/{provider}/{model}-{auth}.yaml in the GitHub repo. Open a PR; CI validates against the schema and rebuilds.

Edit on GitHub MIT licensed