People ask me this all the time.
Short answer: you don't need all four.
Long answer: here's what I actually use each one for.
Claude is my daily driver. Best for nuanced writing, anything that needs voice and tone, and anything where I want pushback. When I want a thinking partner that won't just agree with me, I'm in Claude. Resume bullets, cover letters, prep docs, follow-up emails — all Claude.
ChatGPT is best for structured tasks and when I want a Custom GPT I can reuse. If I'm doing the same task over and over, I build a Custom GPT for it once and stop setting up context every time. Also better for image generation if I need a quick visual.
Gemini is best when I need it tied into Google Workspace. If I'm working out of Google Docs or Gmail and I want AI that already sees my drafts, Gemini is the move. Otherwise I default to Claude.
Perplexity is my research tool, not my writing tool. Best for "what's the recent news on this company," "who are the actual competitors," or "what's the average comp for this role at this level." Source-cited answers, not hallucinated guesses.
You don't need to pay for all of them. Pick one daily driver and one research tool. That's enough.
What's your stack?
Drop it in the comments.