List Models

List Available Models

get

Returns all available AI models along with their pricing, architecture, context length, supported parameters, and (where applicable) per-parameter allowed values. No authentication required.

This is the source of truth for what each model accepts — use supported_parameters and supported_params_details to programmatically discover the exact fields and accepted values for any model (chat, video, image, embedding, audio, etc.).

Responses

200

List of all available models

application/json

429

Rate Limited - You have exceeded your request limits (TPM/RPM). Slow down or increase your limits.

application/json

500

Internal Server Error

get/api/v1/models

HTTPcURLJavaScriptPython

GET /api/v1/models HTTP/1.1
Host: api.fastrouter.ai
Accept: */*

{
  "data": [
    {
      "id": "openai/gpt-5.5-pro",
      "name": "OpenAI: GPT-5.5 Pro",
      "created": 1777051896,
      "context_length": 1050000,
      "architecture": {
        "modality": "text+image+file->text",
        "input_modalities": [
          "file",
          "image",
          "text"
        ],
        "output_modalities": [
          "text"
        ],
        "tokenizer": "GPT"
      },
      "pricing": {
        "prompt": "0.00003",
        "completion": "0.00018"
      },
      "top_provider": {
        "context_length": 1050000,
        "max_completion_tokens": 128000,
        "is_moderated": true
      },
      "supported_parameters": [
        "max_tokens",
        "reasoning",
        "response_format",
        "seed",
        "tool_choice",
        "tools"
      ],
      "is_active": true,
      "creator": "OpenAI"
    },
    {
      "id": "anthropic/claude-sonnet-4-20250514",
      "name": "Anthropic: Claude Sonnet 4",
      "created": 1715731200,
      "context_length": 200000,
      "architecture": {
        "modality": "text+image->text",
        "input_modalities": [
          "text",
          "image"
        ],
        "output_modalities": [
          "text"
        ],
        "tokenizer": "Claude"
      },
      "pricing": {
        "prompt": "0.000003",
        "completion": "0.000015"
      },
      "top_provider": {
        "context_length": 200000,
        "max_completion_tokens": 64000,
        "is_moderated": false
      },
      "supported_parameters": [
        "max_tokens",
        "stop",
        "temperature",
        "tool_choice",
        "tools",
        "top_k",
        "top_p"
      ],
      "is_active": true,
      "creator": "Anthropic"
    },
    {
      "id": "google/gemini-3.5-flash",
      "name": "Google: Gemini 3.5 Flash",
      "created": 1779148800,
      "context_length": 1048576,
      "architecture": {
        "modality": "text,image,video,audio,pdf->text",
        "input_modalities": [
          "text",
          "image",
          "video",
          "audio",
          "pdf"
        ],
        "output_modalities": [
          "text"
        ],
        "tokenizer": ""
      },
      "pricing": {
        "prompt": "0.0000015",
        "completion": "0.000009"
      },
      "top_provider": {
        "context_length": 1048576,
        "max_completion_tokens": 65536,
        "is_moderated": false
      },
      "supported_parameters": [
        "max_tokens",
        "temperature",
        "top_p",
        "seed",
        "stop",
        "tools",
        "tool_choice"
      ],
      "is_active": true,
      "creator": "Google"
    }
  ]
}