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GPT-3.5 Turbo

GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natural language or code, and is optimized for chat and traditional completion tasks. Training data up to Sep 2021.

textfunction tools
gpt-3.5-turbo
Open in playground

Our price

$0.528 / $1.584

input / output per 1M

Official

$0.50 / $1.50
+5.6% vs official

USD · Published rate · Updated 2026-10-12

First request

Available
curl https://api.tokely.me/v1/chat/completions \
  -H "Authorization: Bearer $TOKELY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-3.5-turbo",
    "messages": [{"role": "user", "content": "Hello!"}],
    "max_tokens": 1024
  }'

Set TOKELY_API_KEY to your dashboard key. Requests require a funded Tokely balance. Base URL: https://api.tokely.me/v1.

Capabilities & limits

Context window
16,385 tokens
Model max output
4,096 tokens
Cached input price
$0.528 per 1M tokens
Provider
OpenAI
API model ID
gpt-3.5-turbo
Category
Text
Endpoints
POST /v1/chat/completions
Tokely max output
4,096 tokens / request, including reasoning tokens
Default output
256 tokens. Set an explicit limit for longer responses.
Request limits
16 MB JSON body (including base64) · 128 messages · 32 function tools
Rate limit
60 requests / minute / account, across its keys
Supported input
Text and function tool results
Model modalities
text. Tokely accepts text, inline images and PDFs where listed above; audio and video input are not enabled.

The context includes your instructions, conversation history, tool definitions and generated output. Keep the input and requested output within the model’s context window.

API reference

Authenticate with Authorization: Bearer YOUR_TOKELY_API_KEY. Use an OpenAI SDK with the Tokely base URL.

model
Required string: gpt-3.5-turbo
messages
An array of system, developer, user, assistant and tool messages.
max_tokens
Optional integer, 1–4,096. Defaults to 256.
stream
Streaming has not been verified for this model.
tools
Function definitions executed by your application. Provider-hosted tools are not enabled.

The response contains choices with message or tool_calls, finish_reason, and usage (prompt_tokens, completion_tokens, total_tokens). Streaming sends chat completion chunks.

400 / 415
Invalid request, parameter, endpoint for this model, or content type.
401 / 403
Invalid, revoked or restricted API key.
402
Insufficient account balance or API key budget.
429
Request limit reached. Retry after the indicated delay.
502 / 503 / 504
Upstream failure, temporary service unavailability or request timeout.

Compare nearby prices

USD per million tokens. Compare price and context; these are not quality benchmarks.
ModelInputOutputContext
GPT-3.5 TurboOpenAI · this model$0.528$1.58416,385
GPT-5.4 MiniOpenAI$0.3$1.8400,000
MiniMax M2.5MiniMax$0.515625$1.65204,800
Gemini 2.5 FlashGoogle$0.21$1.751,048,576
Gemini 3.5 Flash LiteGoogle$0.21$1.751,048,576

Frequently asked questions

How much does GPT-3.5 Turbo cost?

$0.528 per million input tokens, $1.584 per million output tokens and $0.528 per million cached input tokens. Usage is charged to your Tokely balance.

Do I need a separate OpenAI account?

Use your Tokely API key and balance. A separate provider key is not required.

How do I switch to this model?

Set model to gpt-3.5-turbo and use /v1/chat/completions. Keep your Tokely base URL and API key.

What is the context window?

16,385 tokens, including input and output. The Tokely request body and output limits listed above also apply.

More OpenAI models & prices

Compare GPT-3.5 Turbo with other OpenAI versions and with the official developer rates.

All OpenAI models on Tokely · Cheap GPT API — Model Prices & Discounts · Compare AI API gateways · Estimate your token cost