OpenAI GPT-3.5 Turbo
Turbocharged version of GPT-3.5, enhancing speed and efficiency
Summary
Index
Second)
token)
Comparison with other models
Quality
Artificial Analysis Quality Index; Higher is better
Speed
Output Tokens per Second; Higher is better
Pricing
USD per 1M Tokens; Lower is better
Latency
Seconds to First Tokens Chunk Received; Lower is better
Authentication
API keys
The OpenAI API uses API keys for authentication. You can create API keys at a user or service account level. Service accounts are tied to a "bot" individual and should be used to provision access for production systems. Each API key can be scoped to one of the following,
- Project keys - Provides access to a single project (preferred option); access Project API keys by selecting the specific project you wish to generate keys against.
- User keys - Our legacy keys. Provides access to all organizations and all projects that user has been added to; access API Keys to view your available keys. We highly advise transitioning to project keys for best security practices, although access via this method is currently still supported.
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Authorization: Bearer OPENAI_API_KEYOrganizations and projects (optional)
For users who belong to multiple organizations or are accessing their projects through their legacy user API key, you can pass a header to specify which organization and project is used for an API request. Usage from these API requests will count as usage for the specified organization and project.
To access the Default project in an organization, leave out the OpenAI-Project header
Example curl command:
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curl https://api.openai.com/v1/models \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "OpenAI-Organization: YOUR_ORG_ID" \
-H "OpenAI-Project: $PROJECT_ID"Example with the `openai` Python package:
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from openai import OpenAI
client = OpenAI(
organization='YOUR_ORG_ID',
project='$PROJECT_ID',
)Example with the `openai` Node.js package:
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import OpenAI from "openai";
const openai = new OpenAI({
organization: "YOUR_ORG_ID",
project: "$PROJECT_ID",
});Organization IDs can be found on your Organization settings page. Project IDs can be found on your General settings page by selecting the specific project.
Create chat completion
Generate AI responses for conversations using text, images, and audio.
Request body
messages array *Required
The conversation history as a series of messages. Supports various formats including text, images, and audio based on model capabilities.
model string *Required
The specific model to be used for generating responses. Check compatibility guide for available models.
store boolean *Optional
Choose whether to save this chat for model improvement purposes. Default is false.
frequency_penalty number *Optional
Adjust from -2 to 2 to control repetition. Positive values reduce word repetition. Default is 0.
presence_penalty number *Optional
Set between -2 and 2 to influence topic variety. Positive values encourage new topics. Default is 0.
temperature number *Optional
Controls response randomness (0-2). Higher for more creative, lower for more focused replies. Default is 1.
top_p number *Optional
Alternative to temperature. Sets probability threshold for token selection. Example: 0.1 means top 10% probable tokens. Default is 1.
stream boolean *Optional
Enable real-time response streaming, similar to ChatGPT. Default is false.
response_format object *Optional
Specify output format. Supports JSON structure for formatted responses. Available on newer models.
seed integer *Optional
Set for consistent responses across multiple calls. Results may still vary slightly.
user string *Optional
Unique identifier for tracking end-user interactions and monitoring system usage.
curl https://api.openai.com/v1/chat/completions
-H "Content-Type: application/json"
-H "Authorization: Bearer $OPENAI_API_KEY"
-d '{
"model": "gpt-4o",
"messages": [
{
"role": "system",
"content": "You are a helpful assistant."
},
{
"role": "user",
"content": "Hello!"
}
]
}1
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{
"id": "chatcmpl-123",
"object": "chat.completion",
"created": 1677652288,
"model": "gpt-4o-mini",
"system_fingerprint": "fp_44709d6fcb",
"choices": [{
"index": 0,
"message": {
"role": "assistant",
"content": "
Hello there, how may I assist you today?",
},
"logprobs": null,
"finish_reason": "stop"
}],
"usage": {
"prompt_tokens": 9,
"completion_tokens": 12,
"total_tokens": 21,
"completion_tokens_details": {
"reasoning_tokens": 0,
"accepted_prediction_tokens": 0,
"rejected_prediction_tokens": 0
}
}
}