OpenAI is a San Francisco-based AI research company founded in 2015 and best known for developing the GPT series of large language models and the ChatGPT product. As of 2026, ChatGPT is the world’s most widely used AI assistant with over 500 million weekly active users. OpenAI offers its technology through consumer subscriptions (ChatGPT plans), an API for developers, and enterprise licensing.
ChatGPT consumer plans as of May 2026: Free gives access to GPT-5.3 Instant with approximately 10 messages per 5-hour rolling window, with limited file uploads and no Deep Research. The Go plan at $8/month (launched January 2026, initially for India, now expanding globally) provides GPT-5.5 access within Codex with a 400K context window. The Plus plan at $20/month grants access to the full GPT-5.5 family, DALL-E image generation, Advanced Voice Mode, web browsing, file analysis, and custom GPTs with higher message limits. The Pro plan at $100/month (April 2026) provides 5x Plus usage quotas and 500 Deep Research sessions. The Pro $200/month plan adds 20x Plus quotas, unlimited Deep Research, Sora video generation, and GPT-5.5 with 1M context window. Business at $30/user/month ($25/user annual, minimum 2 users) adds admin controls, shared workspaces, SOC 2 compliance, and no training on business data. Enterprise is custom-priced.
The ChatGPT API is a separate billing system. GPT-5.5 costs $5/million input tokens and $30/million output tokens (approximately 2x GPT-5.4 pricing). GPT-5.4 costs $2.50 input/$15 output per million tokens. The Batch API offers 50% off for non-time-sensitive workloads. Cached inputs reduce costs further. A Plus subscription and API access are separate products — a $20 Plus subscription does not grant API access.
OpenAI’s head of product signaled in April 2026 that pricing will “significantly evolve” as technology changes, and suggested the company may phase out unlimited plans at some point. Plus has held at $20 for three years while features expanded, which may not last.
