20 tested prompts across 4 stages. Works with ChatGPT, Claude, and Gemini.

Build a rigorous, investor-ready business plan using Claude to research, challenge assumptions, structure strategy, and write every section. This guide walks you through every stage of Claude for Business Planning, from Research and Validation all the way through Review and Challenge, with a tested, copy-ready prompt at each step. Each stage targets a specific phase of the process so you always know exactly what to ask and what output to expect. Works with ChatGPT, Claude, and Gemini and any other major AI tool.
Stage 1
Use Claude to stress-test your business idea before investing time in a full plan.
Critically evaluate this
Critically evaluate this business idea: [DESCRIBE IDEA]. Give me an honest assessment of the strongest arguments for it, the biggest structural risks, and the key assumptions that could prove wrong.
Who is
Who is the real target customer for [BUSINESS]? Go beyond demographics. Describe their specific situation, what they are currently doing about this problem, what they would gain by switching, and what their decision process looks like.
Build market sizing framework
Build a market sizing framework for [BUSINESS IDEA] in [GEOGRAPHY]. Walk me through both a top-down and bottom-up estimate for TAM, SAM, and SOM. Flag which inputs I need to validate with real data.
Core risks
What are the 5 core risks in this business model: [DESCRIBE MODEL]? For each, assess likelihood, potential impact, and what early evidence would confirm or dismiss the risk.
Critical assumptions
What are the critical assumptions in this plan that, if wrong, would make the business unviable: [DESCRIBE PLAN]? Design a cheap, fast experiment to test each assumption.
Stage 2
Use Claude to design and pressure-test a viable, differentiated business model.
Map out the business
Map out the business model for [COMPANY] using the Business Model Canvas. Be specific on value proposition, customer segments, revenue streams, and cost structure. Flag any gaps or inconsistencies.
What pricing model
What pricing model best fits [PRODUCT/SERVICE] for [AUDIENCE]? Compare 3 approaches with the tradeoffs for each. Recommend the one that best aligns customer value capture with our competitive position.
Write positioning statement
Write a positioning statement for [BUSINESS]. Be specific enough that it clearly differentiates from [COMPETITOR A] and [COMPETITOR B]. Avoid generic language like "best" or "innovative."
Most defensible go-to-market
What is the most defensible go-to-market strategy for [BUSINESS] given these constraints: [DESCRIBE RESOURCES, STAGE, MARKET]? Recommend a phased approach with the primary focus at each phase.
What competitive advantages
What competitive advantages could [BUSINESS] build that would be difficult for incumbents to copy in 12-18 months? Evaluate: network effects, switching costs, brand, data moats, and proprietary assets.
Stage 3
Use Claude to write each section with the depth and precision that sophisticated readers expect.
Write executive summary
Write an executive summary for this business plan: [DESCRIBE BUSINESS, STAGE, AND KEY METRICS]. Include: what we do, for whom, the problem, our solution, business model, traction, and funding ask. Under 400 words.
Write market analysis section
Write the market analysis section for [BUSINESS] covering [MARKET/INDUSTRY]. Include: market size and growth rate with sources, 3 key trends, customer segments, and the competitive landscape. Be specific, not generic.
Write competitive analysis section
Write the competitive analysis section for [BUSINESS]. Competitors: [LIST]. Frame our differentiation clearly and honestly, including where we are weaker and how we plan to address those gaps.
Write operations
Write the operations and execution section for [BUSINESS]. Cover: how we deliver the product/service, key operational milestones for the next 12 months, team structure, and critical hires needed.
Write financial summary section
Write the financial summary section for [BUSINESS] based on these projections: [PASTE KEY METRICS]. Explain the revenue model, path to profitability, and what the fundraise achieves.
Stage 4
Use Claude as a tough reviewer to find the weaknesses in your plan before others do.
Skeptical investor reading
Act as a skeptical investor reading this business plan section. What are the 5 questions you would ask, and what would the ideal founder response be: [PASTE SECTION]?
Are the weaknesses
What are the weaknesses in this business plan that a sophisticated reader would notice: [PASTE PLAN OR SECTION]? Be direct. I need to know what to fix before sharing this externally.
Plan claims
My plan claims [SPECIFIC CLAIM]. What level of evidence or data would make this claim credible to someone who has never encountered this business before?
Compare Compare my business
Compare my business plan against the key criteria investors use at the [SEED / SERIES A] stage. Where do I meet the bar and where do I fall short: [PASTE KEY SECTIONS]?
Are the 3 things
What are the 3 things I should add to this business plan to make it significantly more compelling: [PASTE PLAN SUMMARY]? Focus on what would have the greatest impact on credibility.
Claude is particularly strong at critical analysis, structured reasoning, and identifying logical gaps. For business planning, it is useful not just for writing sections but for challenging your assumptions and finding the weaknesses in your argument before investors do.
Yes. Claude drafts every section including executive summary, market analysis, competitive positioning, operations, and financial summary. You provide the specific business details; Claude structures and writes them with precision. Real financial data must come from your research.
Ask Claude to critically evaluate the idea, identify the key assumptions, and design cheap experiments to test each one. Claude is useful for playing devil's advocate and surfacing risks you have not considered.
Claude produces well-reasoned, carefully structured plans. For investor use, add real market data, verified financial projections, and founder-specific context. The draft quality is high; the credibility comes from your underlying business reality.
Claude is strong at holding multiple variables in context and reasoning about them systematically. It does not just answer what you ask, it often identifies what you should have asked. This makes it useful for competitive analysis, risk assessment, and assumption testing.
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