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Drafting plans, financial models, pitch decks — which AI actually understands startups vs corporates.
No credit card · run the same prompt across all 4 models in one window
Business-planning work is part research, part reasoning, part writing. The leading models all handle this competently; the differences are in tone, in willingness to push back on weak assumptions, and in financial-model literacy.
Below is what working founders and consultants actually pick.
Claude is the most willing to argue with a thin assumption and the most readable on long-form strategy. It also has the largest context window for pasting in market research, comps and prior versions of the plan. The runner-up is ChatGPT for spreadsheet-heavy work.
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Strength
Best strategy writing; pushes back; biggest context window.
Weakness
Slightly weaker on freeform spreadsheets.
When to use
Pitch decks, narratives, strategy memos.
Strength
Strong on financial models and structured outputs.
Weakness
Defaults to consultant-flavoured prose.
When to use
Financial modelling, frameworks, structured analysis.
Strength
Strong on real-time market data (TAM, comps).
Weakness
Less distinctive strategic voice.
When to use
Market sizing, competitor scans, factual research.
Strength
Willing to be contrarian on conventional thinking.
Weakness
Less polished for formal documents.
When to use
Founder thinking-aloud, contrarian gut-checks.
Will it actually argue with your plan?
Does it understand unit economics, runway, gross margin?
Can it pull current market size and comps?
Is the output board-ready?
Claude for the narrative arc, ChatGPT for the slide structure. Run both in MultipleChat.
ChatGPT with Code Interpreter (runs the actual numbers). Always verify in spreadsheet software.
Drafts, yes — final, no. Investors discount template plans heavily. AI is your associate, not your author.
Gemini, with real sources. Always verify the math.
MultipleChat lets you run the same prompt across ChatGPT, Claude, Gemini and Grok side-by-side. Verify the ranking on your actual work, not someone else's benchmark.
Try MultipleChat FreeAlso see: Which AI should I use? (quiz) · Best AI for other tasks · AI for your profession
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