ChatGPT

Yes — the free tier includes GPT-5 access with daily caps and limited advanced features. Plus ($20/mo) raises limits, prioritizes access during peak hours, and unlocks new features earlier. Pro ($200/mo) gives near-unlimited use of the strongest models.

ChatGPT is the consumer product at chatgpt.com — bundled with web search, voice, image generation, Custom GPTs. The OpenAI API is for developers to call the underlying models programmatically, usually billed per token rather than monthly subscription. The two have different pricing, rate limits, and feature sets.

On the LMArena Text leaderboard, GPT-5.x high-reasoning variants regularly place in the top 10, neck-and-neck with Claude Opus and Gemini 3. Elo gaps inside the top 10 are usually under 25 points — close enough that task fit matters more than overall rank.

Agent lets ChatGPT autonomously browse the web, click buttons, fill forms, and complete multi-step tasks on your behalf. As of mid-2026 it works well for research and simple workflows, less well for complex multi-app tasks. Still improving rapidly.