OpenAI: GPT-4o (2024-05-13)
GPT-4o (2024-05-13) is a language model from OpenAI released on May 13, 2024. It reads text, images and files and writes text, with a 128K token context window and up to 4K tokens per reply.
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It costs $5 per million input tokens and $15 per million output tokens.
It supports tool calling and structured JSON output.
4 providers serve it, including Kilo Gateway, Merge Gateway and OrcaRouter.
- Modalities
- In / out price
- $5 / $15 per 1M
- Context
- 128K
- Max output
- 4K
- Released
- May 13, 2024
- Knowledge cutoff
- Sep 2023
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
GPT-4o (2024-05-13) 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 | $5 / 1M tokens | |
|---|---|---|
| Output | $15 / 1M tokens |
GPT-4o (2024-05-13) providers
4 providers serve it, including Kilo Gateway, Merge Gateway and OrcaRouter. 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 |
|---|---|---|---|---|---|
| Kilo Gateway | $5 | $15 | – | 128K | 4K |
| Merge Gateway | $5 | $15 | – | 128K | 4K |
| OrcaRouter | $5 | $15 | – | 128K | 4K |
| AI/ML API | $6.50 | $19.50 | – | 128K | 16K |
What GPT-4o (2024-05-13) 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-4o (2024-05-13) through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Temperature
temperature
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GPT-4o (2024-05-13) questions
How much does the GPT-4o (2024-05-13) API cost?
$5 per million input tokens and $15 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-4o (2024-05-13)?
128,000 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-4o (2024-05-13)?
4 providers serve it, including Kilo Gateway, Merge Gateway and OrcaRouter. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does GPT-4o (2024-05-13) 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-4o (2024-05-13) open source?
No. OpenAI serves it through an API only, so you cannot download the weights or host it yourself.
When was GPT-4o (2024-05-13) released?
May 13, 2024, with training data up to Sep 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-4o (2024-05-13)?
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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