OpenAI

OpenAI still owns the biggest ecosystem. Files API, Assistants API, Realtime voice, fine-tuning, batch, and a massive partner marketplace. Pricing is mid-market; features are unmatched.

Models

Privacy

Standard

Founded

2015

San Francisco, CA

Features

realtime voiceassistants apifine tuningbatch apivisioncode interpreter

Models served

Full leaderboard →

ModelInput / 1MOutput / 1MNotes

GPT-5 Turbo
OpenAI
$6.00$24.00—in $6.00 · out $24.00
GPT-5 Mini
OpenAI
$0.50$2.00—in $0.50 · out $2.00
o4
OpenAI
$15.00$60.00—in $15.00 · out $60.00