modelparams.dev

API GitHub

Providers

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

OpenAI model parameters

modelparams.dev tracks parameters for 41 OpenAI models. Open a model to see its full set: the type, default, valid range or values, and the conditions that gate each parameter.

41 models

Chatgpt 4o Latest

Gpt 4 Turbo 2024-04-09

Gpt 4o 2024-11-20

Gpt 5 Chat Latest

Subscription 3 params

Gpt 5.1 Codex Max

Subscription 3 params

Subscription 3 params

Subscription 3 params

Subscription 3 params

Gpt 5.3 Codex Spark

Subscription 3 params

Subscription 3 params

Subscription 3 params

Subscription 3 params

Subscription 3 params

Subscription 3 params

Other providers

Anthropic 38 models Z.ai 19 models MiniMax 16 models Nvidia 16 models Mistral 13 models Google 11 models Alibaba 8 models Cohere 8 models Moonshot AI 8 models xAI 5 models DeepSeek 4 models Meta 4 models Perplexity 4 models Xiaomi 3 models

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/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