Chat With Tool Calling

Chat with Tool Calling

post

Header parameters

AuthorizationstringRequiredExample: sk-lZxz

Body

modelstringRequired

streambooleanRequired

Responses

200Success

application/json

costnumberRequired

idstringRequired

modelstringRequired

rolestringRequired

stop_reasonstringRequired

stop_sequencenullRequired

typestringRequired

post/v1/messages

POST /v1/messages HTTP/1.1
Host: llm.onerouter.pro
Authorization: text
Content-Type: application/json
Accept: */*
Content-Length: 616

{
  "model": "anthropic/claude-opus-4.6",
  "messages": [
    {
      "role": "user",
      "content": "What is the weather like in San Francisco?"
    }
  ],
  "tools": [
    {
      "name": "get_weather",
      "description": "Get the current weather in a given location",
      "input_schema": {
        "type": "object",
        "properties": {
          "location": {
            "type": "string",
            "description": "The city and state, e.g. San Francisco, CA"
          },
          "unit": {
            "type": "string",
            "enum": [
              "celsius",
              "fahrenheit"
            ],
            "description": "The unit for temperature"
          }
        },
        "required": [
          "location"
        ]
      }
    }
  ],
  "tool_choice": {
    "type": "auto",
    "disable_parallel_tool_use": false
  },
  "stream": false,
  "stream_options": {
    "include_usage": true
  },
  "usage": {
    "include": true
  }
}

200Success

{
  "content": [
    {
      "text": "\n\nLet me check the current weather in San Francisco for you.",
      "type": "text"
    },
    {
      "id": "toolu_bdrk_01H5eutNpNmrnGP16LxG3iJa",
      "input": {
        "location": "San Francisco, CA"
      },
      "name": "get_weather",
      "type": "tool_use"
    }
  ],
  "cost": 0.00483,
  "cost_details": {
    "audio_cost": 0,
    "byok_cost": 0,
    "completion_cost": 0.00175,
    "discount_rate": 1,
    "image_cost": 0,
    "is_byok": false,
    "native_web_search_cost": 0,
    "plugin_web_search_cost": 0,
    "prompt_cache_read_cost": 0,
    "prompt_cache_write_1_h": 0,
    "prompt_cache_write_5_min": 0,
    "prompt_cache_write_cost": 0,
    "prompt_cost": 0.00308,
    "reasoning_cost": 0,
    "tools_cost": 0,
    "video_cost": 0
  },
  "id": "msg_bdrk_01EykfxS7GNoxmB9NjeexTRt",
  "model": "anthropic/claude-opus-4.6",
  "role": "assistant",
  "stop_reason": "tool_use",
  "stop_sequence": null,
  "type": "message",
  "usage": {
    "cache_creation": {
      "ephemeral_1h_input_tokens": 0,
      "ephemeral_5m_input_tokens": 0
    },
    "cache_creation_input_tokens": 0,
    "cache_read_input_tokens": 0,
    "input_tokens": 616,
    "output_tokens": 70
  }
}