Create Chat Completion (Non-Streaming)

POST: https://www.kkiai.com/v1/chat/completions

Given a list of messages, the model returns a complete non-streaming chat completion response.

Create a completion for the provided messages and parameters.

Official documentation: https://docs.anthropic.com/en/api/messages

Request Parameters

Authorization

Add the Authorization parameter to the request header. The value should be your API key prefixed with Bearer.

Example: Authorization: Bearer YOUR_API_KEY

Header Parameters

Parameter Name	Type	Required	Description	Example
Content-Type	string	Required	Request content type.	application/json
Accept	string	Optional	Response content type.	application/json
Authorization	string	Required	API key used for authentication.	Bearer YOUR_API_KEY

Body Parameters (application/json)

Parameter Name	Type	Required	Description
model	string	Required	The ID of the model to use. For details on which models are available, see the model list or pricing table.
messages	array[object]	Required	A list of messages that make up the conversation so far.
└ role	string	Required	The role of the message author, such as system, user, or assistant.
└ content	string	Required	The text content of the message.
temperature	number	Optional	What sampling temperature to use, between 0 and 2. Higher values make the output more random, while lower values make it more focused and deterministic. We generally recommend changing either this or top_p, but not both.
top_p	number	Optional	An alternative to sampling with temperature, called nucleus sampling. We generally recommend changing either this or temperature, but not both.
n	integer	Optional	How many chat completion choices to generate for each input message.
stream	boolean	Optional	Defaults to false. For non-streaming requests, omit this parameter or set it to false.
stop	string or array	Optional	Up to 4 sequences where the API will stop generating further tokens.
max_tokens	integer	Optional	The maximum number of tokens to generate in the chat completion.
presence_penalty	number	Optional	Penalizes new tokens based on whether they already appear in the text so far.
frequency_penalty	number	Optional	Penalizes new tokens based on their existing frequency in the text so far.
logit_bias	object or null	Optional	Modifies the likelihood of specified tokens appearing in the completion.
user	string	Optional	A unique identifier representing your end user, which can help monitor and detect abuse.
response_format	object	Optional	Specifies the format that the model should output.
seed	integer	Optional	If specified, the system will make a best effort to sample deterministically.
tools	array[object]	Optional	A list of tools the model may call. Currently, only function tools are supported.
tool_choice	string or object	Optional	Controls which tool, if any, the model should call. Common values include none and auto.

Request Example

{
  "model": "claude-sonnet-4-20250514",
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant."
    },
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}

cURL Example

curl --location --request POST 'https://www.kkiai.com/v1/chat/completions' \
--header 'Accept: application/json' \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data-raw '{
  "model": "claude-sonnet-4-20250514",
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant."
    },
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

Response

🟢 200 OK

Response Body

Parameter Name	Type	Required	Description
id	string	Required	Unique identifier for the chat completion.
object	string	Required	Object type. Always chat.completion.
created	integer	Required	Unix timestamp, in seconds, of when the chat completion was created.
model	string	Required	The model used to generate the completion.
choices	array[object]	Required	A list of chat completion choices.
└ index	integer	Optional	The index of the generated choice.
└ message	object	Optional	The message generated by the model.
└ finish_reason	string	Optional	The reason the model stopped generating tokens.
usage	object	Required	Token usage statistics for the request.
└ prompt_tokens	integer	Required	Number of tokens in the prompt.
└ completion_tokens	integer	Required	Number of tokens in the generated completion.
└ total_tokens	integer	Required	Total number of tokens used in the request.

Response Example

{
  "id": "chatcmpl-123",
  "object": "chat.completion",
  "created": 1677652288,
  "model": "claude-sonnet-4-20250514",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "\n\nHello there, how may I assist you today?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}