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POST
/
v1
/
messages
Chat Completion
curl --request POST \
  --url https://www.anyfast.ai/v1/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "claude-sonnet-4-6-thinking",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "max_tokens": 8192,
  "temperature": 1,
  "top_p": 0.5,
  "frequency_penalty": 0,
  "presence_penalty": 0,
  "stream": false,
  "stop": "<string>"
}
'
{
  "id": "chatcmpl-abc123",
  "object": "chat.completion",
  "created": 123,
  "model": "claude-sonnet-4-6-thinking",
  "choices": [
    {
      "index": 123,
      "message": {
        "role": "assistant",
        "content": "Hello! How can I help you today?"
      }
    }
  ],
  "usage": {
    "prompt_tokens": 123,
    "completion_tokens": 123,
    "total_tokens": 123
  }
}

Authorizations

​
Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Body

application/json
​
model
enum<string>
required

Model ID

Available options:
claude-sonnet-4-6-thinking
Example:

"claude-sonnet-4-6-thinking"

​
messages
object[]
required

A list of messages comprising the conversation so far.

Minimum array length: 1
Example:
[{ "role": "user", "content": "Hello!" }]
​
max_tokens
integer
default:8192

The maximum number of tokens to generate.

Required range: 1 <= x <= 8192
​
temperature
number
default:1

Sampling temperature. Higher values make output more random.

Required range: 0 <= x <= 2
Example:

1

​
top_p
number

Nucleus sampling threshold.

Required range: 0 <= x <= 1
​
frequency_penalty
number
default:0

Penalizes repeated tokens based on their frequency in the text so far.

Required range: -2 <= x <= 2
​
presence_penalty
number
default:0

Penalizes tokens that have already appeared in the text.

Required range: -2 <= x <= 2
​
stream
boolean
default:false

If true, stream partial message deltas using SSE.

​
stop

Sequences where the model will stop generating further tokens.

Response

Completion generated successfully

​
id
string
required
Example:

"chatcmpl-abc123"

​
object
string
required
Example:

"chat.completion"

​
created
integer
required

Unix timestamp

​
model
string
required
Example:

"claude-sonnet-4-6-thinking"

​
choices
object[]
required
​
usage
object