Tool review · Generative AI

o1 review

o1 is a general-purpose AI assistant from OpenAI. Paid only — plans from API: $15/M tokens.

What it is

o1 is a general-purpose AI assistant from OpenAI. Paid only — plans from API: $15/M tokens.

Key features

  • Conversational chat across reasoning, drafting, and analysis tasks
  • File upload (PDF, image, spreadsheet) for in-thread analysis
  • Custom instructions or workspace-style projects
  • API access for developers
  • Native mobile and desktop apps

Pros

  • Strong general reasoning across most domains
  • Wide task coverage from one interface
  • Active model updates and improvements

Cons

  • Output quality varies by task and prompt
  • Hallucinations on niche or recent topics
  • Pricing tiers and limits change frequently
BB
Reviewed by Mr. Bandi
AI productivity analyst · Last reviewed May 2026