# modelparameters.dev > An open, community-maintained catalog of LLM model parameters — every knob you can > turn, for every model, with API-key and subscription variants tracked separately. All data is machine-readable: CORS-enabled static JSON validated against a published JSON Schema, served from the edge under `/api/v1/`. IDs are `provider/model` for API-key variants and `provider/model-subscription` for subscription variants. ## API - [Full catalog](https://modelparams.dev/api/v1/models.json): Every model and its parameters in one JSON file (61 models). - [JSON Schema](https://modelparams.dev/api/v1/schema.json): Validates every entry; use it for editor autocomplete or CI checks. - [API index](https://modelparams.dev/api/v1/index.json): Endpoint map and live model count. ## Guides - [Usage guide + full parameter dump](https://modelparams.dev/llms-full.txt): How to call the API plus every model's parameters inline. ## Models - [anthropic/claude-3-5-haiku-20241022](https://modelparams.dev/api/v1/models/anthropic/claude-3-5-haiku-20241022.json): Anthropic Claude 3.5 Haiku 20241022 (API key) — 4 parameters. - [anthropic/claude-3-5-haiku-latest](https://modelparams.dev/api/v1/models/anthropic/claude-3-5-haiku-latest.json): Anthropic Claude 3.5 Haiku Latest (API key) — 4 parameters. - [anthropic/claude-3-5-sonnet-20241022](https://modelparams.dev/api/v1/models/anthropic/claude-3-5-sonnet-20241022.json): Anthropic Claude 3.5 Sonnet 20241022 (API key) — 4 parameters. - [anthropic/claude-3-5-sonnet-latest](https://modelparams.dev/api/v1/models/anthropic/claude-3-5-sonnet-latest.json): Anthropic Claude 3.5 Sonnet Latest (API key) — 4 parameters. - [anthropic/claude-3-7-sonnet-20250219](https://modelparams.dev/api/v1/models/anthropic/claude-3-7-sonnet-20250219.json): Anthropic Claude 3.7 Sonnet 20250219 (API key) — 6 parameters. - [anthropic/claude-3-7-sonnet-latest](https://modelparams.dev/api/v1/models/anthropic/claude-3-7-sonnet-latest.json): Anthropic Claude 3.7 Sonnet Latest (API key) — 6 parameters. - [anthropic/claude-3-opus-20240229](https://modelparams.dev/api/v1/models/anthropic/claude-3-opus-20240229.json): Anthropic Claude 3 Opus 20240229 (API key) — 4 parameters. - [anthropic/claude-3-opus-latest](https://modelparams.dev/api/v1/models/anthropic/claude-3-opus-latest.json): Anthropic Claude 3 Opus Latest (API key) — 4 parameters. - [anthropic/claude-haiku-4](https://modelparams.dev/api/v1/models/anthropic/claude-haiku-4.json): Anthropic Claude Haiku 4 (API key) — 6 parameters. - [anthropic/claude-haiku-4-5](https://modelparams.dev/api/v1/models/anthropic/claude-haiku-4-5.json): Anthropic Claude Haiku 4.5 (API key) — 6 parameters. - [anthropic/claude-haiku-4-5-20251001](https://modelparams.dev/api/v1/models/anthropic/claude-haiku-4-5-20251001.json): Anthropic Claude Haiku 4.5 20251001 (API key) — 6 parameters. - [anthropic/claude-haiku-4-subscription](https://modelparams.dev/api/v1/models/anthropic/claude-haiku-4-subscription.json): Anthropic Claude Haiku 4 (Subscription) — 6 parameters. - [anthropic/claude-opus-4-1-20250805](https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-1-20250805.json): Anthropic Claude Opus 4.1 20250805 (API key) — 7 parameters. - [anthropic/claude-opus-4-20250514](https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-20250514.json): Anthropic Claude Opus 4.20250514 (API key) — 7 parameters. - [anthropic/claude-opus-4-5-20251101](https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-5-20251101.json): Anthropic Claude Opus 4.5 20251101 (API key) — 8 parameters. - [anthropic/claude-opus-4-6](https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-6.json): Anthropic Claude Opus 4.6 (API key) — 8 parameters. - [anthropic/claude-opus-4-7](https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-7.json): Anthropic Claude Opus 4.7 (API key) — 4 parameters. - [anthropic/claude-opus-4-subscription](https://modelparams.dev/api/v1/models/anthropic/claude-opus-4-subscription.json): Anthropic Claude Opus 4 (Subscription) — 6 parameters. - [anthropic/claude-sonnet-4-20250514](https://modelparams.dev/api/v1/models/anthropic/claude-sonnet-4-20250514.json): Anthropic Claude Sonnet 4.20250514 (API key) — 7 parameters. - [anthropic/claude-sonnet-4-5](https://modelparams.dev/api/v1/models/anthropic/claude-sonnet-4-5.json): Anthropic Claude Sonnet 4.5 (API key) — 6 parameters. - [anthropic/claude-sonnet-4-5-20250929](https://modelparams.dev/api/v1/models/anthropic/claude-sonnet-4-5-20250929.json): Anthropic Claude Sonnet 4.5 20250929 (API key) — 6 parameters. - [anthropic/claude-sonnet-4-6](https://modelparams.dev/api/v1/models/anthropic/claude-sonnet-4-6.json): Anthropic Claude Sonnet 4.6 (API key) — 8 parameters. - [anthropic/claude-sonnet-4-subscription](https://modelparams.dev/api/v1/models/anthropic/claude-sonnet-4-subscription.json): Anthropic Claude Sonnet 4 (Subscription) — 6 parameters. - [deepseek/deepseek-chat](https://modelparams.dev/api/v1/models/deepseek/deepseek-chat.json): DeepSeek Deepseek Chat (API key) — 4 parameters. - [deepseek/deepseek-reasoner](https://modelparams.dev/api/v1/models/deepseek/deepseek-reasoner.json): DeepSeek Deepseek Reasoner (API key) — 5 parameters. - [deepseek/deepseek-v4-flash](https://modelparams.dev/api/v1/models/deepseek/deepseek-v4-flash.json): DeepSeek Deepseek V4 Flash (API key) — 5 parameters. - [deepseek/deepseek-v4-pro](https://modelparams.dev/api/v1/models/deepseek/deepseek-v4-pro.json): DeepSeek Deepseek V4 Pro (API key) — 5 parameters. - [openai/chatgpt-4o-latest](https://modelparams.dev/api/v1/models/openai/chatgpt-4o-latest.json): OpenAI Chatgpt 4o Latest (API key) — 3 parameters. - [openai/gpt-3.5-turbo](https://modelparams.dev/api/v1/models/openai/gpt-3.5-turbo.json): OpenAI Gpt 3.5 Turbo (API key) — 3 parameters. - [openai/gpt-4-turbo](https://modelparams.dev/api/v1/models/openai/gpt-4-turbo.json): OpenAI Gpt 4 Turbo (API key) — 3 parameters. - [openai/gpt-4-turbo-2024-04-09](https://modelparams.dev/api/v1/models/openai/gpt-4-turbo-2024-04-09.json): OpenAI Gpt 4 Turbo 2024.04 09 (API key) — 3 parameters. - [openai/gpt-4.1](https://modelparams.dev/api/v1/models/openai/gpt-4.1.json): OpenAI Gpt 4.1 (API key) — 3 parameters. - [openai/gpt-4.1-mini](https://modelparams.dev/api/v1/models/openai/gpt-4.1-mini.json): OpenAI Gpt 4.1 Mini (API key) — 3 parameters. - [openai/gpt-4.1-nano](https://modelparams.dev/api/v1/models/openai/gpt-4.1-nano.json): OpenAI Gpt 4.1 Nano (API key) — 3 parameters. - [openai/gpt-4o](https://modelparams.dev/api/v1/models/openai/gpt-4o.json): OpenAI GPT-4o (API key) — 3 parameters. - [openai/gpt-4o-2024-11-20](https://modelparams.dev/api/v1/models/openai/gpt-4o-2024-11-20.json): OpenAI Gpt 4o 2024.11 20 (API key) — 3 parameters. - [openai/gpt-4o-mini](https://modelparams.dev/api/v1/models/openai/gpt-4o-mini.json): OpenAI GPT-4o mini (API key) — 3 parameters. - [openai/gpt-5](https://modelparams.dev/api/v1/models/openai/gpt-5.json): OpenAI Gpt 5 (API key) — 2 parameters. - [openai/gpt-5-chat-latest](https://modelparams.dev/api/v1/models/openai/gpt-5-chat-latest.json): OpenAI Gpt 5 Chat Latest (API key) — 1 parameter. - [openai/gpt-5-mini](https://modelparams.dev/api/v1/models/openai/gpt-5-mini.json): OpenAI Gpt 5 Mini (API key) — 2 parameters. - [openai/gpt-5-nano](https://modelparams.dev/api/v1/models/openai/gpt-5-nano.json): OpenAI Gpt 5 Nano (API key) — 2 parameters. - [openai/gpt-5.1](https://modelparams.dev/api/v1/models/openai/gpt-5.1.json): OpenAI Gpt 5.1 (API key) — 2 parameters. - [openai/gpt-5.1-codex-max-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.1-codex-max-subscription.json): OpenAI Gpt 5.1 Codex Max (Subscription) — 3 parameters. - [openai/gpt-5.1-codex-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.1-codex-subscription.json): OpenAI Gpt 5.1 Codex (Subscription) — 3 parameters. - [openai/gpt-5.2](https://modelparams.dev/api/v1/models/openai/gpt-5.2.json): OpenAI Gpt 5.2 (API key) — 2 parameters. - [openai/gpt-5.2-codex-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.2-codex-subscription.json): OpenAI Gpt 5.2 Codex (Subscription) — 3 parameters. - [openai/gpt-5.2-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.2-subscription.json): OpenAI Gpt 5.2 (Subscription) — 3 parameters. - [openai/gpt-5.3-codex-spark-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.3-codex-spark-subscription.json): OpenAI Gpt 5.3 Codex Spark (Subscription) — 3 parameters. - [openai/gpt-5.3-codex-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.3-codex-subscription.json): OpenAI Gpt 5.3 Codex (Subscription) — 3 parameters. - [openai/gpt-5.4](https://modelparams.dev/api/v1/models/openai/gpt-5.4.json): OpenAI Gpt 5.4 (API key) — 2 parameters. - [openai/gpt-5.4-mini](https://modelparams.dev/api/v1/models/openai/gpt-5.4-mini.json): OpenAI Gpt 5.4 Mini (API key) — 2 parameters. - [openai/gpt-5.4-mini-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.4-mini-subscription.json): OpenAI Gpt 5.4 Mini (Subscription) — 3 parameters. - [openai/gpt-5.4-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.4-subscription.json): OpenAI Gpt 5.4 (Subscription) — 3 parameters. - [openai/gpt-5.5](https://modelparams.dev/api/v1/models/openai/gpt-5.5.json): OpenAI Gpt 5.5 (API key) — 2 parameters. - [openai/gpt-5.5-subscription](https://modelparams.dev/api/v1/models/openai/gpt-5.5-subscription.json): OpenAI Gpt 5.5 (Subscription) — 3 parameters. - [openai/o1](https://modelparams.dev/api/v1/models/openai/o1.json): OpenAI o1 (API key) — 2 parameters. - [openai/o1-mini](https://modelparams.dev/api/v1/models/openai/o1-mini.json): OpenAI o1-mini (API key) — 2 parameters. - [openai/o1-preview](https://modelparams.dev/api/v1/models/openai/o1-preview.json): OpenAI O1 Preview (API key) — 2 parameters. - [openai/o3](https://modelparams.dev/api/v1/models/openai/o3.json): OpenAI o3 (API key) — 2 parameters. - [openai/o3-mini](https://modelparams.dev/api/v1/models/openai/o3-mini.json): OpenAI o3-mini (API key) — 2 parameters. - [openai/o4-mini](https://modelparams.dev/api/v1/models/openai/o4-mini.json): OpenAI o4-mini (API key) — 2 parameters. ## Optional - [GitHub repository](https://github.com/mnfst/modelparameters.dev): Source data, JSON Schema, and contribution guide. - [Web catalog](https://modelparams.dev/): Searchable HTML view that also exposes WebMCP tools to in-browser agents.