Chat Completions

Create a completion for the chat conversation

Authorization

AuthorizationBearer <token>

Bearer token authentication using API keys

In: header

Request Body

modelstring

messages

temperature?number|null

max_tokens?number|null

top_p?number|null

frequency_penalty?number|null

presence_penalty?number|null

response_format?

stream?boolean

Defaultfalse

tools?

Tools available to the model. Supports function tools (cross-provider), web_search tools, and provider-specific native tools like Anthropic's text_editor_20250429 for optimized code editing.

tool_choice?string|

Value in"required" | "none" | "auto"

reasoning_effort?string|null

Controls the reasoning effort for reasoning-capable models

Value in"minimal" | "low" | "medium" | "high"

effort?string|null

Controls the computational effort for supported models (currently only claude-opus-4-5-20251101)

Value in"low" | "medium" | "high"

free_models_only?boolean

When used with auto routing, only route to free models (models with zero input and output pricing)

Defaultfalse

no_reasoning?boolean

When used with auto routing, exclude reasoning models from selection

Defaultfalse

sensitive_word_check?

image_config?

web_search?boolean

Enable native web search for models that support it. When enabled, the model can search the web for real-time information.

Defaultfalse

plugins?

Plugins to enable for this request. Currently supported: response-healing (automatically repairs malformed JSON responses when using response_format)

Response Body

curl -X POST "https://api.llmapi.ai/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }'

curl -X POST "https://api.llmapi.ai/v1/chat/completions" \  -H "Content-Type: application/json" \  -d '{    "model": "gpt-5",    "messages": [      {        "role": "user",        "content": "Hello!"      }    ]  }'

{
  "id": "string",
  "object": "string",
  "created": 0,
  "model": "string",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "string",
        "content": "string",
        "reasoning": "string",
        "tool_calls": [
          {
            "id": "string",
            "type": "function",
            "function": {
              "name": "string",
              "arguments": "string"
            }
          }
        ],
        "images": [
          {
            "type": "image_url",
            "image_url": {
              "url": "string"
            }
          }
        ]
      },
      "finish_reason": "string"
    }
  ],
  "usage": {
    "prompt_tokens": 0,
    "completion_tokens": 0,
    "total_tokens": 0,
    "reasoning_tokens": 0,
    "prompt_tokens_details": {
      "cached_tokens": 0
    },
    "cost_usd_total": 0,
    "cost_usd_input": 0,
    "cost_usd_output": 0,
    "cost_usd_cached_input": 0,
    "info": "string",
    "cost_usd_request": 0
  },
  "metadata": {
    "requested_model": "string",
    "requested_provider": "string",
    "used_model": "string",
    "used_provider": "string",
    "underlying_used_model": "string"
  }
}

{
  "error": {
    "message": "string",
    "type": "string",
    "param": "string",
    "code": "string"
  }
}

Chat Completions

Authorization

Request Body

Response Body

200

500