ChatGPT
Free tierOpenAI's conversational AI — the world's most widely-used LLM interface.
Free tier available·All audiences·Powered by OpenAI·API available
Key strengths
conversational AIbroad knowledgeplugins/toolscode generation
Free tier + paid plans · from $20 USD/mo
San Francisco, US
Founded 2022
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ChatGPT is built on OpenAI's GPT-4o family of models. It supports multi-turn conversations, function calling via the Assistants API, file uploads, image generation (via DALL·E), and web browsing. The API is REST-based and offers streaming via SSE.
curl https://api.openai.com/v1/chat/completions \
-H "Authorization: Bearer $OPENAI_KEY" \
-d '{"model":"gpt-4o","messages":[{"role":"user","content":"Hello"}]}'