modelparams.dev
API GitHub

Providers

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

Providers

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

How to use the API

The full catalog is available as static JSON, CORS-enabled, served from the edge. You can also install the npm package or point your AI agent at /llms.txt.

Building with an AI agent? Point it at /llms.txt for a machine-readable overview, or copy any snippet below.

Full catalog

Returns every model in the catalog with all parameters, types, defaults, and ranges.

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

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

Single model

Fetch the full definition for a specific model, including its provider.

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

Parameters only

If you only need the parameters for a model without knowing the provider, use the providerless endpoint.

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

JSON Schema

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

GET 
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

npm package

Install the package to query the catalog locally or in your build pipeline. 

npm i modelparams

Logos

Provider logos are available as SVGs. They use currentColor so they inherit your text color. 

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

Replace anthropic with any provider slug: openai, google, meta, mistral, deepseek, etc.

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 the site automatically.

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