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

Anthropic API parameters

modelparams.dev tracks API parameters for 46 Anthropic models. Open a model to see its full set: the type, default, valid range or values, and the conditions that gate each parameter.

46 models

Claude 3 Opus 20240229
Messages API 4 params
Claude 3 Opus Latest
Messages API 4 params
Claude 3.5 Haiku 20241022
Messages API 4 params
Claude 3.5 Haiku Latest
Messages API 4 params
Claude 3.5 Sonnet 20241022
Messages API 4 params
Claude 3.5 Sonnet Latest
Messages API 4 params
Claude 3.7 Sonnet 20250219
Messages API 6 params
Claude 3.7 Sonnet Latest
Messages API 6 params
Claude Fable 5
Messages API 4 params
Claude Fable 5
Messages API Subscription 4 params
Claude Fable 5.1
Messages API 4 params
Claude Haiku 4
Messages API 6 params
Claude Haiku 4
Messages API Subscription 6 params
Claude Haiku 4.5
Messages API 6 params
Claude Haiku 4.5
Messages API Subscription 6 params
Claude Haiku 4.5 20251001
Messages API 6 params
Claude Haiku 4.5 20251001
Messages API Subscription 6 params
Claude Haiku 5.5
Messages API 2 params
Claude Opus 4
Messages API Subscription 6 params
Claude Opus 4 20250514
Messages API 7 params
Claude Opus 4 20250514
Messages API Subscription 7 params
Claude Opus 4.1 20250805
Messages API 7 params
Claude Opus 4.1 20250805
Messages API Subscription 7 params
Claude Opus 4.5 20251101
Messages API 8 params
Claude Opus 4.5 20251101
Messages API Subscription 8 params
Claude Opus 4.6
Messages API 8 params
Claude Opus 4.6
Messages API Subscription 8 params
Claude Opus 4.7
Messages API 4 params
Claude Opus 4.7
Messages API Subscription 4 params
Claude Opus 4.8
Messages API 4 params
Claude Opus 4.8
Messages API Subscription 4 params
Claude Opus 5
Messages API 4 params
Claude Opus 5
Messages API Subscription 4 params
Claude Opus 5.5
Messages API 4 params
Claude Sonnet 4
Messages API Subscription 6 params
Claude Sonnet 4 20250514
Messages API 7 params
Claude Sonnet 4 20250514
Messages API Subscription 7 params
Claude Sonnet 4.5
Messages API 6 params
Claude Sonnet 4.5
Messages API Subscription 6 params
Claude Sonnet 4.5 20250929
Messages API 6 params
Claude Sonnet 4.5 20250929
Messages API Subscription 6 params
Claude Sonnet 4.6
Messages API 8 params
Claude Sonnet 4.6
Messages API Subscription 8 params
Claude Sonnet 5
Messages API 4 params
Claude Sonnet 5
Messages API Subscription 4 params
Claude Sonnet 5.5
Messages API 2 params

Other providers

Alibaba 81 models OpenAI 62 models Bedrock 56 models NVIDIA 34 models Google 33 models Mistral 32 models Fireworks 25 models Z.ai 24 models Opencode Go 18 models MiniMax 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