Perplexity vs ChatGPT "Deep Research" For Startup Ideas Shocked Me

February 19, 2025

AI Summary

5 min read

Perplexity vs ChatGPT Deep Research: A Head-to-Head Test for Startup Ideas

The host of The Startup Ideas Podcast ran a controlled experiment: feed the same prompt into both ChatGPT's Deep Research ($200/month Pro plan) and Perplexity's Deep Research ($20/month, with a free tier) and see which one produces better startup ideas and growth playbooks. The prompt asked for five AI agent startup ideas with zero-to-one playbooks, targeting $1M ARR in year one, $3M in year two, and $5M in year three, with an MVP budget under $5,000. The results were surprisingly close—and both were good enough to make the host say "scary good."

How the Two Tools Differ in Process

The most immediate difference was in how each tool handled the initial prompt. ChatGPT Deep Research asked a series of qualification questions before starting: what industries, whether to target enterprises or SMBs, preferred AI capabilities, technical resources, go-to-market approach, and whether the founder wanted to eventually raise VC. This forced the user to clarify constraints upfront—including the $5,000 MVP budget and a preference for viral self-serve growth. Perplexity Deep Research did not ask any follow-up questions. It simply took the raw prompt and began searching.

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What you'll learn

1 (00:00) **Episode Setup & Prompt Design** - Host introduces a head-to-head test of ChatGPT Pro ($200/mo) vs Perplexity ($20/mo) Deep Research for generating startup ideas and playbooks.
2 (04:50) **Perplexity Deep Research: First Results** - Perplexity finishes faster than ChatGPT, pulling from 34 sources including the host's own YouTube video.
3 (15:35) **ChatGPT Deep Research: First Results** - ChatGPT produces a much longer, more detailed report, but takes longer to generate.
4 (25:54) **Head-to-Head Comparison** - Host contrasts the two tools' outputs and workflow styles.
5 (27:37) **Follow-Up Prompting: Deepening the Ideas** - Host tests both tools with follow-up questions to refine the legal contract idea.
6 (37:08) **Final Verdict & Resources** - Host summarizes the comparison and provides a free download of all generated ideas.
7 Standout Quotes

+ Full timestamped outline available in the app

Show Notes

Get Greg’s Deep research research notes: https://www.gregisenberg.com/deep-research-ideas

I compare in real-time ChatGPT's and Perplexity's deep research capabilities for developing startup ideas. Both platforms were prompted to generate AI agent business ideas with specific revenue targets ($1M Y1, $3M Y2, $5M Y3). The results showed that Perplexity provided faster, more concise responses, while ChatGPT offered more detailed, comprehensive analysis but took longer to generate responses.

Key Points:
• Comparison between ChatGPT Pro ($200/month) and Perplexity Deep Research (free/~$20/month) for startup ideation
• Both platforms were tested with identical prompts for creating AI-based startup ideas
• Comparison of response speed, depth, and quality between the two platforms
• Practical demonstration of how to use AI tools for business planning and market research

Timestamps:
00:00 - Intro
01:33 - Defining the Startup Prompt
02:29 - Initiating Research with ChatGPT
05:05 - Initiating Research with Perplexity
09:13 - Perplexity results (Legal Contract AI)
15:44 - ChatGPT results (AI Sales Outreach Assistant)
26:10 - Comparing Perplexity and ChatGPT Outputs
27:55 - Follow-Up Prompts and Further Exploration
31:55 - Perplexity's Follow-Up results
34:43 - ChatGPT's Follow-Up results
37:07 - Where to get Greg’s Deep research research notes
37:31 - Conclusion: Choosing Between Tools

1) THE SETUP:
• Testing ChatGPT Pro ($200/mo) vs Perplexity Deep Research ($20/mo)
• Same prompt: Build a defensible AI agent startup
• Target: $5M ARR in 3 years
• MVP budget: $5K

2) PERPLEXITY AI WINS ON SPEED
• Completed research in ~2 mins
• Analyzed 34+ sources
• More concise, actionable insights
• Free tier available!

3) CHATGPT WINS ON DEPTH
• Longer, more detailed analysis
• Comprehensive playbooks
• Better market context
• More examples & case studies

4) BEST STARTUP IDEAS GENERATED:

Legal Contract AI (Perplexity):
• $2.4B market opportunity
• Auto-redline contracts
• Defensible through learning
• Clear path to $5.4M ARR

AI Sales Assistant (ChatGPT):
• Virtual SDR automation
• Network effect moat
• Product-led growth strategy
• $100M+ potential

5) MVP INSIGHTS:

For $5K budget:
• Use existing APIs (OpenAI/GPT-4)
• Start with Chrome extension
• Focus on single workflow
• Manual fallback for quality
• Self-serve freemium model

6) KEY TAKEAWAYS:

Both tools are INSANELY good
• Perplexity = Fast, concise, free tier
• ChatGPT = Deeper analysis, more context
• Both provide actionable insights
• Worth integrating into workflow

7) PROTIP:
For best results:
• Be specific with constraints
• Ask follow-up questions
• Double-click on interesting areas
• Cross-reference competitor ins