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.
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.