OpenAI: GPT-3.5-Turbo-Instruct
GPT-3.5-Turbo-Instruct is a language model from OpenAI released on Sep 20, 2023. It reads text and images and writes text, with a 4K token context window and up to 1K tokens per reply.
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It costs $1.40 per million input tokens and $1.80 per million output tokens.
It supports tool calling and structured JSON output.
2 providers serve it, including Poe and Kilo Gateway.
- Modalities
- In / out price
- $1.40 / $1.80 per 1M
- Context
- 4K
- Max output
- 1K
- Released
- Sep 20, 2023
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
GPT-3.5-Turbo-Instruct pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $1.40 / 1M tokens | |
|---|---|---|
| Output | $1.80 / 1M tokens |
GPT-3.5-Turbo-Instruct providers
2 providers serve it, including Poe and Kilo Gateway. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Poe | $1.40 | $1.80 | – | 4K | 1K |
| Kilo Gateway | $1.50 | $2 | – | 4K | 4K |
What GPT-3.5-Turbo-Instruct costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call GPT-3.5-Turbo-Instruct through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs
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GPT-3.5-Turbo-Instruct questions
How much does the GPT-3.5-Turbo-Instruct API cost?
$1.40 per million input tokens and $1.80 per million output tokens. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of GPT-3.5-Turbo-Instruct?
3,500 tokens of input, and it can write up to 1,024 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve GPT-3.5-Turbo-Instruct?
2 providers serve it, including Poe and Kilo Gateway. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does GPT-3.5-Turbo-Instruct support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is GPT-3.5-Turbo-Instruct open source?
No. OpenAI serves it through an API only, so you cannot download the weights or host it yourself.
When was GPT-3.5-Turbo-Instruct released?
Sep 20, 2023.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on GPT-3.5-Turbo-Instruct?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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