OpenAI’s API and product tiers—ChatGPT Plus/Team/Enterprise, GPT-4 Turbo and 4o variants, the Agents SDK, and the Codex CLI.
OpenAI serves models via the API (chat completions, Responses API) and consumer/enterprise tiers of ChatGPT. Model families include GPT-4 Turbo, GPT-4o, and GPT-4o Mini; the OpenAI Agents SDK and Codex CLI add agent primitives and coding workflows.
Fit
Commonly paired or compared with Claude; teams often evaluate both on the same benchmark suite before procurement.