Claude
Option 1: Use a Project (best method)
- Go to claude.ai and create a New Project
- Inside the project, open Project Instructions
- Paste your caption structure there, something like:
"Always write captions following this structure: [Hook line] + [2-3 lines of value/story] + [CTA]. Tone: conversational, no hashtag spam, end with a question. Never repeat the same opening."
- Every conversation inside that project will follow this automatically.
Option 2: Start each chat with a style prompt
Paste a "style brief" at the top of the conversation once, then just ask for captions normally after.
ChatGPT
Option 1: Custom Instructions (always on)
- Click your profile icon > Settings > Personalization > Custom Instructions
- In the "How should ChatGPT respond?" box, paste your caption structure/rules
- This applies to every conversation automatically, no need to re-paste
Option 2: Create a GPT (most powerful)
- Go to chatgpt.com/gpts > Create
- In the instructions, define the exact caption structure, tone, and rules
- Save it and use that GPT every time you need captions
- You can even give it your brand voice examples
Option 3: Start a long thread and pin it
Keep one ongoing ChatGPT conversation for captions. The context stays alive and it "learns" your style as you go. Not ideal long-term but works for short campaigns.
The Real Power Move (for both)
Give it 3-5 example captions you've already approved and say:
"These are captions I love. Extract the structure, tone, and style from them. Use this as your framework going forward, but write every caption fresh."
This way it reverse-engineers your style rather than you having to describe it.