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Use /v1/messages when your client already speaks the Anthropic Messages format. 
curl https://api.apiany.ai/v1/messages \
  -H "Authorization: Bearer $APIANY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "minimax-m3",
    "max_tokens": 512,
    "messages": [
      { "role": "user", "content": "Draft three API docs section titles." }
    ]
  }'
APIAny.AI processes the request and returns an Anthropic-compatible response.

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Tool use

Declare tools with tools (each has name, description, input_schema) and control selection with tool_choice. Multi-turn tool_use / tool_result content blocks are supported. 
{
  "model": "minimax-m3",
  "max_tokens": 512,
  "tools": [
    {
      "name": "get_weather",
      "description": "Get current weather",
      "input_schema": {
        "type": "object",
        "properties": { "location": { "type": "string" } },
        "required": ["location"]
      }
    }
  ],
  "tool_choice": { "type": "auto" },
  "messages": [{ "role": "user", "content": "Weather in NYC?" }]
}

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Streaming

Set stream: true to receive Anthropic server-sent events: message_start, content_block_start, content_block_delta, content_block_stop, message_delta, message_stop.

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Parameters

Supported: model, messages, max_tokens (required), system, temperature, top_p, top_k, stop_sequences, tools, tool_choice, and stream.