When to Use ChatGPT, Claude, and DeepSeek
You’ve built deep proficiency with DeepSeek as your primary AI. But sometimes another tool has a specific superpower you need. This page shows you exactly which AI to reach for—and when to stick with your default. All your prompting skills transfer seamlessly; no new frameworks required.
🆚 At a Glance
🧠 DeepSeek
Best for: Your everyday workhorse.
- Deep reasoning, logic, math
- Code generation and debugging
- Processing very long documents (up to 1M tokens)
- Free, no usage caps
Stick with DeepSeek for most tasks.
🎨 ChatGPT
Best for: Visual and real‑time tasks.
- Image generation (DALL·E)
- Live web browsing (where available)
- Voice conversation (mobile app)
Switch when you need images, current data, or voice.
📚 Claude
Best for: Deep document analysis and caution.
- Upload entire books and query them
- Structured extraction (tables, citations)
- Cautious, safety‑oriented answers
- Nuanced, balanced prose
Use when you need careful, cited document work.
🔄 Your CTFC Skills Transfer Instantly
The prompting framework you’ve learned—Context, Task, Format, Constraints—works identically across all three AIs. The only difference is personality. ChatGPT tends to be more verbose and enthusiastic; Claude is more cautious and sometimes needs polite reframing. But the fundamental method never changes.
📸 Use Case 1: Generate an Image with ChatGPT (DALL·E)
When you need a visual, DeepSeek can’t help—ChatGPT can. Apply CTFC directly:
Task: Generate an image of a person working on a laptop in a cosy, futuristic home office. A large window shows a green eco‑friendly city.
Format: Digital illustration, warm lighting, 16:9.
Constraints: No text in the image. No corporate handshake clichés. Mood: calm, optimistic.
Then refine just like any prompt: “Make the city greener with more trees, less sci‑fi.” The loop is identical to what you’ve practised.
🌐 Use Case 2: Browse the Live Web with ChatGPT
When you need information newer than DeepSeek’s knowledge cutoff (May 2025), and ChatGPT has browsing enabled, ask it to search and cite sources. Then verify.
Step 1: Ask ChatGPT with browsing: “Find the most recent UK unemployment rate. Cite the source.”
Step 2: Bring the answer back to DeepSeek: “ChatGPT says the current rate is 4.3% based on a BBC article. Based on pre‑2025 trends, does that seem plausible? What should I double‑check?”
Step 3: Go to the original source yourself.
📖 Use Case 3: Upload a Book to Claude
Claude excels at reading and answering questions across entire documents. Use the same Source Anchoring technique from the Truth page:
Then ask: “Create a character relationship map for Elizabeth Bennet in Pride and Prejudice. For each connection, provide a quote and chapter reference.”
🔍 The Triangulation Method (High‑Stakes Only)
For critical questions—health, legal, financial—don’t trust a single AI. Cross‑check:
- Ask DeepSeek with full CTFC + Confidence Prompting + Contrarian Edit.
- Ask ChatGPT/Claude the same question, with confidence ratings.
- Compare: Agreement boosts reliability. Disagreement is a red flag. One AI giving a very specific number while others give ranges? That’s a likely hallucination.
- Verify with an actual human‑curated source before acting.
Three AIs can share the same blind spot. Triangulation reduces risk; it doesn’t eliminate it.
🗺️ Quick Decision Guide
| Task | Use |
|---|---|
| Coding, math, logic, reasoning | DeepSeek |
| Writing, summarisation, learning | DeepSeek (default) |
| Image generation | ChatGPT (DALL·E) |
| Live web data / current events | ChatGPT (browsing) |
| Voice brainstorming | ChatGPT (mobile app) |
| Upload a book/contract and query it | Claude (or DeepSeek if fits) |
| Cautious second opinion | Claude |
| Fact‑checking critical claims | Triangulate all three |
You now know when to use each AI. Ready to build your own permanent specialist?