Gusto

OpenAI

Gusto

Gusto charges a monthly base fee plus a per-employee fee. The Simple plan starts at $40/month plus $6 per employee per month.

Plus and Premium tiers add features like time tracking, PTO management, and dedicated support at higher price points.

The per-employee pricing creates natural revenue growth — as customers hire more people, Gusto makes more money without any additional sales effort. This aligns Gusto's success with their customers' growth, which is a beautiful incentive structure.

Additional revenue comes from embedded financial products. Gusto Wallet (employee banking), Gusto-run health benefits, 401(k) administration, and workers' comp insurance all generate fees.

The payroll platform becomes a distribution channel for financial services — once you process payroll for a company, you have a direct relationship with every employee and can offer them financial products.

OpenAI

OpenAI makes money primarily through API access and subscriptions. The API charges developers per token (roughly per word) for using GPT models in their applications.

ChatGPT Plus costs $20/month for individual users, ChatGPT Team is $25-30/user/month, and ChatGPT Enterprise is custom-priced. Microsoft pays OpenAI licensing fees and also resells OpenAI models through Azure OpenAI Service.

OpenAI's annualised revenue ran past $13 billion during 2025 and kept climbing from there, which is the kind of growth curve that normally only exists in a pitch deck.

Gusto

Josh Reeves, Edward Kim, and Tomer London were Stanford engineering graduates who noticed that every small business owner they talked to hated the same thing: payroll. Running payroll meant calculating federal, state, and local taxes, filing quarterly returns, issuing W-2s, managing direct deposits, and dealing with an alphabet soup of compliance requirements (FICA, FUTA, SUTA).

One mistake and the IRS sends a penalty notice.

The existing solutions were terrible for small businesses. ADP and Paychex dominated the market but were designed for mid-to-large companies.

Their interfaces looked like they were built in 1998 (because they were). Their pricing was opaque.

Their customer service required calling a 1-800 number and sitting on hold. Small businesses with 5-50 employees were dramatically underserved.

The trio founded ZenPayroll in 2011 (rebranded to Gusto in 2015) with the mission of making payroll dead simple. The first version was a clean web interface that let business owners run payroll in a few clicks — enter hours, review the numbers, hit submit.

Gusto calculated all taxes automatically, filed them with the government, and sent direct deposits. What used to take half a day took five minutes.

OpenAI

OpenAI was founded in December 2015 as a nonprofit AI research lab. The founding donors — including Elon Musk, Sam Altman, Peter Thiel, Reid Hoffman, and Jessica Livingston — pledged $1 billion with a mission to build artificial general intelligence (AGI) that would benefit all of humanity.

The idea was that AI was too important and too dangerous to leave in the hands of Google alone.

Sam Altman became chairman while Greg Brockman (former CTO of Stripe) became president. Ilya Sutskever, one of the most respected AI researchers alive, left Google Brain to become chief scientist.

The early team was stacked with world-class researchers who published their work openly — hence "Open" AI.

But AI research turned out to be staggeringly expensive. Training large models required millions of dollars in compute.

In 2019, OpenAI created a "capped-profit" subsidiary — investors could earn up to 100x their money, but profits beyond that would flow to the nonprofit. Microsoft invested $1 billion.

The mission was still to save humanity. The method now involved making a lot of money first.

Gusto

Gusto grew by being the payroll platform that accountants recommended. Accountants manage payroll for thousands of small businesses, and Gusto built a dedicated Partner Program for accounting firms.

When a CPA recommends Gusto to all their small business clients, that's efficient distribution at scale.

The product-led growth motion is strong. Gusto's clean design and simple setup meant small business owners could sign up, enter their employee information, and run their first payroll without talking to a salesperson.

Free trials converted at high rates because the alternative was going back to manual calculations.

Expanding from payroll into HR, benefits, and financial services followed the natural workflow. Once Gusto ran payroll, adding benefits administration was a natural upsell — the same system that calculates pre-tax deductions can also manage the benefits that create those deductions.

OpenAI

ChatGPT's launch in November 2022 was the growth strategy — it just wasn't planned that way. The team expected a modest research preview.

Instead, ChatGPT hit 1 million users in 5 days and 100 million monthly active users in 2 months, making it the fastest-growing consumer application in history. The product went viral because it felt like magic — for the first time, anyone could have a natural conversation with a machine that seemed to understand them.

The Microsoft partnership provided distribution at massive scale. Microsoft integrated OpenAI models into Bing, Office 365 (Copilot), GitHub (Copilot), and Azure.

Overnight, hundreds of millions of Microsoft users had access to OpenAI technology. Microsoft's $13 billion investment was the largest AI bet in history and gave OpenAI nearly unlimited compute.

The API created an ecosystem. Thousands of startups built products on top of OpenAI's models — from customer service bots to coding assistants to content generators.

Each API customer locked themselves into OpenAI's ecosystem, creating switching costs and recurring revenue.

Gusto

ADP and Paychex aren't going to cede the small business market quietly. ADP Run is their small business product, and they've been modernizing it aggressively.

ADP has 70+ years of trust, massive sales teams, and relationships with every accountant in America. Gusto has a better product experience, but ADP has distribution that's hard to match.

Rippling is the most dangerous competitor. Parker Conrad (Rippling's CEO) is building an "all-in-one" HR/IT/Finance platform that includes payroll alongside device management, app provisioning, and expense management.

Rippling argues that payroll should be one feature in a broader system, not a standalone product. If companies buy Rippling for IT management and get payroll included, Gusto loses the deal.

Moving upmarket is hard. Gusto's sweet spot is companies with 1-100 employees.

Larger companies have more complex needs — multiple pay schedules, union rules, multi-state compliance, custom integrations — that Gusto's platform historically hasn't handled as well as incumbents.

OpenAI

The board crisis of November 2023 nearly destroyed the company. The nonprofit board fired Sam Altman as CEO on a Friday, citing a loss of confidence.

Within 48 hours, 95% of employees threatened to quit and follow Altman to Microsoft. By Tuesday, Altman was reinstated and the board was restructured.

The incident exposed the fundamental tension between OpenAI's nonprofit governance and its for-profit ambitions — a tension it finally addressed in late 2025 by restructuring the business as a public benefit corporation sitting under the original nonprofit.

The cost of training frontier models is eye-watering. Each new GPT generation costs hundreds of millions to train.

OpenAI is reportedly spending over $7 billion annually on compute. The company is burning through cash faster than almost any startup in history, which is why it keeps raising at higher and higher valuations.

If revenue growth slows before costs stabilize, the math gets ugly.

Safety concerns are not going away. Multiple prominent researchers have left OpenAI over disagreements about the pace of development versus safety research.

Ilya Sutskever, the chief scientist who was central to the board's decision to fire Altman, left in 2024 to start a safety-focused AI lab. The public debate about whether OpenAI is moving too fast — and whether its safety commitments are genuine — grows louder with every capability improvement.

Gusto

Gusto Payroll — automated full-service payroll processing with tax calculations, filings, and direct deposits across all 50 states. Gusto Benefits — health insurance, dental, vision, 401(k), HSA, FSA, commuter benefits, and workers' compensation administered through the platform.

Gusto HR — hiring and onboarding tools, employee self-service portal, org charts, and document management. Gusto Time & Attendance — built-in time tracking with PTO management, holiday calendars, and overtime calculations.

Gusto Wallet — a free employee financial wellness app offering early wage access, savings accounts, and financial planning tools.

OpenAI

ChatGPT is the consumer chatbot — the product that made AI mainstream overnight. The flagship GPT models are multimodal, handling text, images, and audio in one system.

The OpenAI API lets developers integrate GPT into any application. DALL-E generates images from text descriptions.

Whisper transcribes and translates audio. Sora generates videos from text prompts.

GPT Store lets users create and share custom GPT agents. ChatGPT Enterprise gives businesses a private, secure version of ChatGPT with admin controls and no data training.

Gusto

Google Capital (now CapitalG) led the Series C. General Catalyst invested early and has been in multiple rounds.

Dragoneer, T. Rowe Price, and Fidelity participated in later growth rounds.

Y Combinator was the starting point (Winter 2012 batch). The company was valued at $9.5 billion in its latest funding round in 2022.

OpenAI

Microsoft ($13B), Thrive Capital, Khosla Ventures, Sequoia Capital, Founders Fund, Tiger Global, SoftBank, a16z