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Turn Any AI into the Expert You Need with One Phrase

The 'act as...' technique gives AI precise context - results change in seconds

  1. 1.Open your browser and go to chat.openai.com or claude.ai - both services are free to use without a credit card.

    ChatGPT gives fast answers, Claude digs deeper into complex tasks. Pick either one.

    ChatGPT or Claude ↗
  2. 2.Start a new chat (or open an existing one) and write one sentence: the role you want the AI to take on.

    Don't describe or explain - just say who it is. The AI will instantly shift to the right style and depth.

    ChatGPT or Claude ↗
    Prompt
    You are [EXPERT], an expert in [FIELD]. You respond in the style of [STYLE]. Your goal is to [GOAL].
    What this prompt doesReplace [EXPERT] with a specific role (like «product manager», «business consultant», «technical writer»), [FIELD] with a topic (like «SaaS marketing», «systems design»), [STYLE] with a tone (like «concise and actionable», «detailed and academic»), [GOAL] with what you want to achieve. Example: You are a senior product manager, an expert in B2B SaaS growth. You respond in the style of direct, numbers-driven communication. Your goal is to help founders validate product-market fit.
  3. 3.Send this intro message and wait for the AI to confirm the role (usually it'll say something like 'Understood, I'll respond as...').

    This is critical: the AI must understand and accept the role before you start asking real questions.

    ChatGPT or Claude ↗
  4. 4.Now ask your question or describe your problem in the same chat - the AI will respond from the perspective of that role.

    The more precisely you define the role, the better the answer. Skip vague 'help me' - give a specific task instead.

    ChatGPT or Claude ↗
    Prompt
    I need to [SPECIFIC TASK]. What's your advice?
    What this prompt doesReplace [SPECIFIC TASK] with what you need. Example: 'I need to pitch our new feature to enterprise clients who are risk-averse. What's your advice?' The AI will answer as the expert you defined, with the right depth and style.
  5. 5.Refine answers by asking follow-up questions in the same role. For a new role, create a new chat.

    One chat = one role. Need different expertise? Start a fresh conversation with a new intro message.

    ChatGPT or Claude ↗
💰 What it costs to followprices as of 2026-07
  • freeChatGPT (Free Tier)Free access to GPT-4o, roughly 10-40 messages per day, no credit card needed.
  • freeClaude (Free Tier)Free access to Claude Sonnet, roughly 30-50 messages in a 5-hour window, no credit card needed.
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