modelparams.dev
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Providers

Alibaba Anthropic Bedrock Cerebras Cohere DeepSeek Fireworks Google Groq Meta MiniMax Mistral Moonshot AI NVIDIA OpenAI Perplexity Thinking Machines Vertex xAI Xiaomi Z.ai

Providers

Alibaba Anthropic Bedrock Cerebras Cohere DeepSeek Fireworks Google Groq Meta MiniMax Mistral Moonshot AI NVIDIA OpenAI Perplexity Thinking Machines Vertex xAI Xiaomi Z.ai
OpenAI 3 params

OpenAI GPT-4o mini API parameters

These are the API parameters modelparams.dev tracks for OpenAI GPT-4o mini — the settings you send in a request. 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.

After the parameter count instead — how many weights GPT-4o mini has? That's a different number, and we don't track it. Here's the difference.

Length 1 param
Parameter Type Default Description Condition
Max tokens
max_tokens 		integer (1…+∞) 4096 Maximum number of output tokens the model may generate. —
Sampling 2 params
Parameter Type Default Description Condition
Temperature
temperature 		number (0…2 step 0.1) 1 Controls randomness. Lower values make outputs more focused; higher values make them more varied. —
Top P
top_p 		number (0…1 step 0.01) 1 Controls nucleus sampling by limiting generation to tokens whose cumulative probability reaches this value. —

OpenAI GPT-4o mini API parameters in brief

OpenAI GPT-4o mini documents 3 API parameters, grouped by what they control:

Frequently asked questions

Which API parameters does OpenAI GPT-4o mini support?
OpenAI GPT-4o mini accepts 3 API parameters in the request body: max_tokens, temperature, top_p.
What is the default temperature for OpenAI GPT-4o mini?
The default temperature for OpenAI GPT-4o mini is 1, within a valid range of 0 to 2.
What is the default top_p for OpenAI GPT-4o mini?
The default top_p for OpenAI GPT-4o mini is 1, within a valid range of 0 to 1.
What is the default max_tokens for OpenAI GPT-4o mini?
The default max_tokens for OpenAI GPT-4o mini is 4096, with a minimum of 1.

Resources

All OpenAI models Glossary Full catalog

GPT-4o mini — JSON

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

/api/v1/models/openai/gpt-4o-mini.json 
{
  "$schema": "https://modelparams.dev/api/v1/schema.json",
  "provider": "openai",
  "authType": "api_key",
  "model": "gpt-4o-mini",
  "status": "active",
  "params": [
    {
      "path": "max_tokens",
      "label": "Max tokens",
      "description": "Maximum number of output tokens the model may generate.",
      "group": "generation_length",
      "type": "integer",
      "default": 4096,
      "range": {
        "min": 1
      }
    },
    {
      "path": "temperature",
      "label": "Temperature",
      "description": "Controls randomness. Lower values make outputs more focused; higher values make them more varied.",
      "group": "sampling",
      "type": "number",
      "default": 1,
      "range": {
        "min": 0,
        "max": 2,
        "step": 0.1
      }
    },
    {
      "path": "top_p",
      "label": "Top P",
      "description": "Controls nucleus sampling by limiting generation to tokens whose cumulative probability reaches this value.",
      "group": "sampling",
      "type": "number",
      "default": 1,
      "range": {
        "min": 0,
        "max": 1,
        "step": 0.01
      }
    }
  ]
}

Other OpenAI models

ChatGPT 4o Latest 3 params View GPT-3.5 Turbo 3 params View GPT-3.5 Turbo 16K 3 params View GPT-4 6 params View GPT-4 0613 3 params View GPT-4 Turbo 3 params View GPT-4 Turbo 2024-04-09 3 params View GPT-4.1 3 params View GPT-4.1 Mini 3 params View GPT-4.1 Nano 3 params View GPT-4o 3 params View GPT-4o 2024-11-20 3 params View GPT-5 2 params View GPT-5 Chat Latest 1 param View GPT-5 Mini 2 params View GPT-5 Nano 2 params View GPT-5.1 2 params View GPT-5.1 Codex Subscription 3 params View GPT-5.1 Codex Max Subscription 3 params View GPT-5.2 2 params View GPT-5.2 Subscription 3 params View GPT-5.2 Codex Subscription 3 params View GPT-5.3 Codex 2 params View GPT-5.3 Codex Subscription 3 params View GPT-5.3 Codex Spark Subscription 3 params View GPT-5.4 2 params View GPT-5.4 Subscription 3 params View GPT-5.4 Mini 2 params View GPT-5.4 Mini Subscription 3 params View GPT-5.4 Nano 2 params View GPT-5.4 Pro 2 params View GPT-5.4 Pro Subscription 3 params View GPT-5.5 2 params View GPT-5.5 Subscription 3 params View GPT-5.5 Pro 2 params View GPT-5.5 Pro Subscription 3 params View GPT-5.6 2 params View GPT-5.6 Luna 2 params View GPT-5.6 Luna Subscription 3 params View GPT-5.6 Sol 2 params View GPT-5.6 Sol Subscription 3 params View GPT-5.6 Terra 2 params View GPT-5.6 Terra Subscription 3 params View GPT-OSS 120B 6 params View GPT-OSS 20B 6 params View GPT-OSS Safeguard 120B 4 params View GPT-OSS Safeguard 20B 4 params View o1 2 params View o1-mini 2 params View o1-preview 2 params View o3 2 params View o3-mini 2 params View o3-pro 2 params View o4-mini 2 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 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/models/openai/gpt-5.5.json
curl https://modelparams.dev/api/v1/models/openai/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