modelparams.dev
API MCP GitHub

Providers

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

OpenAI API parameters

modelparams.dev tracks API parameters for 62 OpenAI models. Open a model to see its full set: the type, default, valid range or values, and the conditions that gate each parameter.

62 models

ChatGPT 4o Latest
Chat Completions 3 params
GPT-3.5 Turbo
Chat Completions 3 params
GPT-3.5 Turbo 0125
Chat Completions 3 params
GPT-3.5 Turbo 1106
Chat Completions 3 params
GPT-3.5 Turbo 16K
Chat Completions 3 params
GPT-4
Chat Completions 6 params
GPT-4 0613
Chat Completions 3 params
GPT-4 Turbo
Chat Completions 3 params
GPT-4 Turbo 2024-04-09
Chat Completions 3 params
GPT-4.1
Chat Completions 3 params
GPT-4.1 Mini
Chat Completions 3 params
GPT-4.1 Nano
Chat Completions 3 params
GPT-4o
Chat Completions 3 params
GPT-4o 2024-11-20
Chat Completions 3 params
GPT-4o mini
Chat Completions 3 params
GPT-5
Chat Completions 2 params
GPT-5 Chat Latest
Chat Completions 1 param
GPT-5 Mini
Chat Completions 2 params
GPT-5 Nano
Chat Completions 2 params
GPT-5.1
Chat Completions 2 params
GPT-5.1 Codex
Responses API Subscription 3 params
GPT-5.1 Codex Max
Responses API Subscription 3 params
GPT-5.2
Chat Completions 2 params
GPT-5.2
Responses API Subscription 3 params
GPT-5.2 Codex
Responses API Subscription 3 params
GPT-5.2 Pro
Chat Completions 1 param
GPT-5.3 Codex
Chat Completions 2 params
GPT-5.3 Codex
Responses API Subscription 3 params
GPT-5.3 Codex Spark
Responses API Subscription 3 params
GPT-5.4
Chat Completions 2 params
GPT-5.4
Responses API Subscription 3 params
GPT-5.4 Mini
Chat Completions 2 params
GPT-5.4 Mini
Responses API Subscription 3 params
GPT-5.4 Nano
Chat Completions 2 params
GPT-5.4 Pro
Chat Completions 2 params
GPT-5.4 Pro
Responses API Subscription 3 params
GPT-5.5
Chat Completions 2 params
GPT-5.5
Responses API Subscription 3 params
GPT-5.5 Pro
Chat Completions 2 params
GPT-5.5 Pro
Responses API Subscription 3 params
GPT-5.6
Chat Completions 2 params
GPT-5.6 Luna
Chat Completions 2 params
GPT-5.6 Luna
Responses API Subscription 3 params
GPT-5.6 Sol
Chat Completions 2 params
GPT-5.6 Sol
Responses API Subscription 3 params
GPT-5.6 Terra
Chat Completions 2 params
GPT-5.6 Terra
Responses API Subscription 3 params
GPT-6 Astra
Chat Completions 6 params
GPT-6 Luna
Chat Completions 3 params
GPT-6 Sol
Chat Completions 6 params
GPT-6.1 Sol
Chat Completions 3 params
GPT-OSS 120B
Chat Completions 6 params
GPT-OSS 20B
Chat Completions 6 params
GPT-OSS Safeguard 120B
Chat Completions 4 params
GPT-OSS Safeguard 20B
Chat Completions 4 params
o1
Chat Completions 2 params
o1-mini
Chat Completions 2 params
o1-preview
Chat Completions 2 params
o3
Chat Completions 2 params
o3-mini
Chat Completions 2 params
o3-pro
Chat Completions 2 params
o4-mini
Chat Completions 2 params

Other providers

Alibaba 78 models Bedrock 56 models Anthropic 43 models Google 32 models NVIDIA 32 models Mistral 30 models Z.ai 24 models Fireworks 23 models MiniMax 16 models Opencode Go 16 models xAI 14 models Moonshot AI 11 models Vertex 11 models Cohere 8 models Groq 7 models Meta 6 models DeepSeek 4 models Perplexity 4 models Xiaomi 3 models Cerebras 1 model Thinking Machines 1 model

Resources

Glossary Full catalog

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