OpenAI: GPT-3.5 Turbo
GPT-3.5 Turbo is a language model from OpenAI released on Mar 1, 2023. It reads text and writes text, with a 16K token context window and up to 4K tokens per reply.
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It costs $0.50 per million input tokens and $1.50 per million output tokens.
It supports tool calling and structured JSON output.
11 providers serve it, including Vercel AI Gateway, Poe and DevPass (LLM Gateway). The lowest input price is $0.45 per million tokens at Poe.
- Modalities
- In / out price
- $0.50 / $1.50 per 1M
- Context
- 16K
- Max output
- 4K
- Released
- Mar 1, 2023
- Knowledge cutoff
- Sep 2021
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
GPT-3.5 Turbo 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 | $0.50 / 1M tokens | |
|---|---|---|
| Output | $1.50 / 1M tokens |
GPT-3.5 Turbo providers
11 providers serve it, including Vercel AI Gateway, Poe and DevPass (LLM Gateway). The lowest input price is $0.45 per million tokens at Poe. 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 |
|---|---|---|---|---|---|
| Vercel AI Gateway | $0.50 | $1.50 | – | 16K | 4K |
| Poe | $0.45 | $1.40 | – | 16K | 2K |
| DevPass (LLM Gateway) | $0.50 | $1.50 | $0 | 16K | 4K |
| Eden AI | $0.50 | $1.50 | – | 16K | 4K |
| Impossibl | $0.50 | $1.50 | – | 16K | 4K |
| Kilo Gateway | $0.50 | $1.50 | – | 16K | 4K |
| LLM Gateway | $0.50 | $1.50 | – | 16K | 4K |
| Merge Gateway | $0.50 | $1.50 | – | 16K | 4K |
| NanoGPT | $0.50 | $1.50 | – | 16K | 4K |
| OrcaRouter | $0.50 | $1.50 | $0 | 16K | 4K |
| AI/ML API | $0.65 | $1.95 | – | 16K | 4K |
What GPT-3.5 Turbo 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 through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Temperature
temperature
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GPT-3.5 Turbo questions
How much does the GPT-3.5 Turbo API cost?
$0.50 per million input tokens and $1.50 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?
16,385 tokens of input, and it can write up to 4,096 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve GPT-3.5 Turbo?
11 providers serve it, including Vercel AI Gateway, Poe and DevPass (LLM Gateway). The lowest input price is $0.45 per million tokens at Poe. 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 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 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 released?
Mar 1, 2023, with training data up to Sep 2021.
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?
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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