Strategic Acquisition Brief · Confidential
One asset, two surfaces. MaxiFi is the deterministic math substrate beneath the May-15 ChatGPT consumer-finance launch — and the engine fee-only advisors already pay for today via the MaxiFi Pro subscription. Built over 30 years by BU economist Laurence Kotlikoff. With OpenAI’s S-1 filed May 22, it is the capital-light, defensible IP an LLM cannot reverse-engineer.
In the last sixty days, the financial-services AI conversation bifurcated. OpenAI claimed the consumer surface on May 15. Anthropic and Perplexity moved on the professional surface in the first half of May. Two surfaces, one math layer underneath each — and MaxiFi is the engine on both.
OpenAI generated $13.1B revenue in 2025 against ~$22B of cost — a ~$9B net loss carried into a filing now targeting a $1T-plus listing. The equity story needs a defensible, high-margin, capital-light asset that lives outside the compute line item. The May-15 consumer launch is the candidate — if the engine underneath is correct by construction rather than by probability.
MaxiFi resolves it — the validated, deterministic engine that produces the mathematically correct lifetime plan, and the same engine that already runs in the wealth-advisor channel today via MaxiFi Pro.
MaxiFi is the financial-planning platform of Economic Security Planning, Inc., built over more than three decades by Professor Laurence Kotlikoff of Boston University. It uses consumption smoothing and dynamic programming to compute the single, mathematically optimal lifetime plan — solving simultaneously across Social Security strategy, Roth-conversion sequencing, withdrawal order, and the full post-OBBBA tax code.
Goals-based planners answer “What is the chance you hit your number?” MaxiFi answers “What is the optimal path?” Different class of engine. Already in the field on both surfaces today.
Prof. Laurence Kotlikoff — William Fairfield Warren Professor at Boston University; Harvard Ph.D.; former Senior Economist on the President’s Council of Economic Advisers; named by The Economist among the 25 most influential economists.
Bankrate’s #1 planning software for 2025. Taught by Nobel Laureate Robert Merton at MIT Sloan as an “outstanding science-based lifecycle and retirement management platform.”
Patented algorithms refined over 30+ years. OBBBA-current — the post-July-2025 tax-code interactions the LLM training data does not contain. Defensible under SEC Reg BI, DOL fiduciary, FINRA AI, EU AI Act.
MaxiFi is in the wealth-advisor channel today via its Pro subscription — fee-only planners use it as top-of-funnel lure and client-retention glue. The acquirer inherits a paying B2B/B2B2C base that extends naturally to ChatGPT’s ~900M weekly users on the consumer side.
There are only two kinds of software an AI lab should own rather than imitate: data a model cannot scrape, and an engine that returns a certain mathematical answer too complex for a language model to reproduce. MaxiFi is the second kind. OpenAI’s own Hiro had to be hand-trained to “nail financial math” with a verifier — the implicit admission the base model isn’t the right tool.
ChatGPT brings the consumer interface, the memory, the account connectivity, and distribution to ~900 million weekly users. MaxiFi Pro brings the paying advisor channel and 30 years of validated math. Owned together, OpenAI takes both surfaces with one acquisition — and forecloses the option to every rival.
On May 15 OpenAI claimed the consumer surface with ChatGPT Personal Finance (Pro tier, Plaid across 12,000+ institutions). At the same time Anthropic, Perplexity, and Google are moving on the professional surface — advisors, asset managers, wealth platforms. MaxiFi is the deterministic engine underneath both. One asset. Two surfaces.
The May-15 launch is the front end of OpenAI’s most defensible consumer business — if it sits on an engine correct by construction. MaxiFi is that engine. It is the substance behind a credible $100/month Pro tier, the credibility bar that unlocks the Plus rollout, and the math integration the Intuit and Plaid partnerships connect to.
MaxiFi is in the wealth-advisor channel today via its Pro subscription: fee-only advisors use it as top-of-funnel lure to win prospects and as the recurring lifecycle math that keeps client relationships annual. That’s the same B2B/wealth surface Anthropic and Perplexity launched into earlier this month. OpenAI inherits an installed paying base.
With the S-1 confidentially filed May 22, the equity story needs a defensible high-margin asset that lives outside the compute line item. 30-year trade-secret IP, Bankrate’s #1 planning software for 2025, OBBBA-current, defensible under SEC Reg BI, DOL fiduciary, FINRA AI, and EU AI Act — the kind of vertical that underwrites a premium multiple.
There is one MaxiFi. If it lands at Anthropic, Google DeepMind, Meta, or a large fintech, OpenAI’s claim to either surface weakens permanently. The denial case sits alongside the offensive one.
A 20-minute briefing with a live demonstration: MaxiFi solves a household’s lifetime plan while the leading frontier models are asked to match it. The gap is the entire thesis.
MaxiFi is being offered through a focused strategic process. For OpenAI the integration path is short, the talent is complementary to the Roi/Hiro teams already in-house, and the strategic payoff — consumer-product integrity, advisor-channel inheritance, S-1-grade moat, and competitive denial — is immediate.