TokenOff
OpenAI

Chat Completions API

Call OpenAI models using the Chat Completions API.

Get Your API Key

Go to the API Keys page to create your API key.

API Base URL

https://tokenoff.com/api

OpenAI models support the /v1/chat/completions endpoint, fully compatible with the OpenAI Chat Completions API.

curl

Blocking Call

curl https://tokenoff.com/api/v1/chat/completions \
  -H "Authorization: Bearer your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
      "model": "gpt-5.4",
      "messages": [
          {"role": "user", "content": "Hello"}
      ]
  }'

Output:

{"id":"resp_07cc003c4736c70b0069e0c1e41c2c8196952f2f53524e1891","object":"chat.completion","created":1776337380,"model":"gpt-4.1","choices":[{"index":0,"message":{"role":"assistant","content":"Hello! How can I help you today?"},"finish_reason":"stop"}],"usage":{"prompt_tokens":7,"completion_tokens":13,"total_tokens":20}}

Streaming Response

curl https://tokenoff.com/api/v1/chat/completions \
  -H "Authorization: Bearer your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
      "model": "gpt-5.4",
      "messages": [
          {"role": "user", "content": "Hello"}
      ],
      "stream": true
  }'

Output:

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":"Hello"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":"!"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":" How"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":" can"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":" I"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":" help"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":" you"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":" today"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{"content":"?"},"finish_reason":null}]}

data: {"id":"resp_01570884e7e6265a0069e0c260ed9c8194bd120e896b171efb","object":"chat.completion.chunk","created":1776337504,"model":"gpt-4.1","choices":[{"index":0,"delta":{},"finish_reason":"stop"}],"usage":{"prompt_tokens":7,"completion_tokens":13,"total_tokens":20}}

data: [DONE]

Python

pip install openai

Blocking Call

from openai import OpenAI

client = OpenAI(
  api_key="your_api_key_here",
  base_url="https://tokenoff.com/api/v1",
)

response = client.chat.completions.create(
  model="gpt-5.4",
  messages=[
      {"role": "user", "content": "Hello"}
  ],
)

print(response.choices[0].message.content)

Output:

Hello! How can I help?

Streaming Response

from openai import OpenAI

client = OpenAI(
  api_key="your_api_key_here",
  base_url="https://tokenoff.com/api/v1",
)

response = client.chat.completions.create(
  model="gpt-5.4",
  messages=[
      {"role": "user", "content": "Hello"}
  ],
  stream=True,
)

for event in response:
  print(event)

Output:

ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content='', function_call=None, refusal=None, role='assistant', tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content='Hello', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content='!', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content=' How', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content=' can', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content=' I', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content=' help', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content='?', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=None)
ChatCompletionChunk(id='resp_02f00b38518533fd0069e0c3f104fc819484590784cd3b0aa7', choices=[Choice(delta=ChoiceDelta(content=None, function_call=None, refusal=None, role=None, tool_calls=None), finish_reason='stop', index=0, logprobs=None)], created=1776337905, model='gpt-4.1', object='chat.completion.chunk', service_tier=None, system_fingerprint=None, usage=CompletionUsage(completion_tokens=11, prompt_tokens=7, total_tokens=18, completion_tokens_details=None, prompt_tokens_details=None))

TypeScript

npm install openai

Blocking Call

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "your_api_key_here",
  baseURL: "https://tokenoff.com/api/v1",
});

const response = await client.chat.completions.create({
  model: "gpt-5.4",
  messages: [
      { role: "user", content: "Hello" },
  ],
});

console.log(response.choices[0]?.message.content);

Output:

Hello! How can I help you today?

Streaming Response

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "your_api_key_here",
  baseURL: "https://tokenoff.com/api/v1",
});

const response = await client.chat.completions.create({
  model: "gpt-5.4",
  messages: [
      { role: "user", content: "Hello" },
  ],
  stream: true,
});

for await (const event of response) {
console.log(event);
}

Output:

{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: [Object], finish_reason: null } ]
}
{
  id: 'resp_09288c4e32022db60069e0c4918cec819699f22a80c5900655',
  object: 'chat.completion.chunk',
  created: 1776338065,
  model: 'gpt-4.1',
  choices: [ { index: 0, delta: {}, finish_reason: 'stop' } ],
  usage: { prompt_tokens: 7, completion_tokens: 13, total_tokens: 20 }
}

Supported Models

gpt-5.4

GPT-5.4

gpt-5.4-mini

GPT-5.4 mini

gpt-5.4-nano

GPT-5.4 nano

gpt-5.2

GPT-5.2

gpt-5.1

GPT-5.1

gpt-5

GPT-5

gpt-5-mini

GPT-5 mini

gpt-5-nano

GPT-5 nano

gpt-4.1

GPT-4.1

gpt-4.1-mini

GPT-4.1 mini

gpt-4.1-nano

GPT-4.1 nano

gpt-4o

GPT-4o

gpt-4o-mini

GPT-4o mini

o4-mini

o4-mini

o3

o3

o3-mini

o3-mini

o3-pro

o3-pro

gpt-5.3-codex

GPT-5.3-Codex

gpt-5.3-codex-spark

GPT-5.3-Codex-Spark

gpt-5.2-codex

GPT-5.2-Codex

gpt-5.1-codex-max

GPT-5.1-Codex-Max

gpt-5.1-codex

GPT-5.1-Codex

gpt-5-codex

GPT-5-Codex

gpt-5.1-codex-mini

GPT-5.1-Codex-Mini

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Python
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Streaming Response
TypeScript
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Supported Models
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