Provider
OpenAI on ModelServer
OpenAI is the maker of GPT-4o and the o-series reasoning models. Its API is the de-facto industry standard, supporting text, vision, function calling, and structured output.
All OpenAI models
Click any model to see full pricing, context window, code examples and FAQ.
GPT-4o
128KOpenAI's flagship multimodal model — text, vision, and structured output.
Input
$2.50
Output
$10.00
Open →
GPT-4o mini
128KCheap and fast OpenAI workhorse. Great default for high-volume apps.
Input
$0.15
Output
$0.60
Open →
o3
200KOpenAI's reasoning model. Step-by-step problem solving for math, code, and science.
Input
$10.00
Output
$40.00
Open →
Use OpenAI models with one ModelServer key.
Pay-as-you-go pricing, OpenAI-compatible API, automatic failover. No subscription, no monthly minimum.