modelparams.dev
API GitHub

Providers

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

Providers

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

Anthropic model parameters

modelparams.dev tracks parameters for 38 Anthropic models. Open a model to see its full set: the type, default, valid range or values, and the conditions that gate each parameter.

38 models

Claude 3 Opus 20240229
4 params
Claude 3 Opus Latest
4 params
Claude 3.5 Haiku 20241022
4 params
Claude 3.5 Haiku Latest
4 params
Claude 3.5 Sonnet 20241022
4 params
Claude 3.5 Sonnet Latest
4 params
Claude 3.7 Sonnet 20250219
6 params
Claude 3.7 Sonnet Latest
6 params
Claude Fable 5
4 params
Claude Fable 5
Subscription 4 params
Claude Haiku 4
6 params
Claude Haiku 4
Subscription 6 params
Claude Haiku 4.5
6 params
Claude Haiku 4.5
Subscription 6 params
Claude Haiku 4.5 20251001
6 params
Claude Haiku 4.5 20251001
Subscription 6 params
Claude Opus 4
Subscription 6 params
Claude Opus 4 20250514
7 params
Claude Opus 4 20250514
Subscription 7 params
Claude Opus 4.1 20250805
7 params
Claude Opus 4.1 20250805
Subscription 7 params
Claude Opus 4.5 20251101
8 params
Claude Opus 4.5 20251101
Subscription 8 params
Claude Opus 4.6
8 params
Claude Opus 4.6
Subscription 8 params
Claude Opus 4.7
4 params
Claude Opus 4.7
Subscription 4 params
Claude Opus 4.8
4 params
Claude Opus 4.8
Subscription 4 params
Claude Sonnet 4
Subscription 6 params
Claude Sonnet 4 20250514
7 params
Claude Sonnet 4 20250514
Subscription 7 params
Claude Sonnet 4.5
6 params
Claude Sonnet 4.5
Subscription 6 params
Claude Sonnet 4.5 20250929
6 params
Claude Sonnet 4.5 20250929
Subscription 6 params
Claude Sonnet 4.6
8 params
Claude Sonnet 4.6
Subscription 8 params

Other providers

OpenAI 41 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