OpenAI

Headquarters: San Francisco, CA, USAFounded: 2015Official Website →

AI research and deployment company behind GPT-4o, GPT-5, and o-series reasoning models.

Models by OpenAI (131)

OpenAI
API

GPT-5

Params
Multi-Trillion MoE
Context
1.0M
Speed
—
Release
Aug 2026
Pricing / 1M:$2.50/$10.00
View Specs
OpenAI
API

o3

Params
Undisclosed (Reasoning)
Context
200k
Speed
—
Release
Dec 2025
Pricing / 1M:$4.00/$18.00
View Specs
OpenAI
API

o1

Params
Undisclosed (Reasoning)
Context
200k
Speed
—
Release
Dec 2024
Pricing / 1M:$15.00/$60.00
View Specs