Companies that use ChatGPT (customer list)

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BDO USA Udemy DoorDash Morgan Stanley AccuWeather Grab Pfizer Thomson Reuters Materials Market October Health

We also want to show some examples so you can see our data is accurate. We've tried to include a diverse range of companies, big and small, across industries, using ChatGPT in different ways: general productivity, customer-facing chatbots, content generation, and building custom GPT-powered internal tools.

BDO USA

Accounting & Advisory · Chicago, IL · ChatGPT Enterprise (via Microsoft Azure OpenAI)

BDO USA is a ChatGPT Enterprise customer with around 10,000 employees. Working with Microsoft, they built an internal generative AI tool called Chat BDO, a secure customized version of ChatGPT on Azure AI built for use inside the firm. They deployed it to all employees in August 2023. It now has 12,000 users and has saved over 600,000 hours of work since launch.

Rather than giving everyone a generic ChatGPT interface, BDO built role-specific "personas": purpose-built virtual assistants for specific workflows. For example, their Consultative Selling Persona uses multiple AI agents to pull together company intelligence, industry trends, and regulatory activity into a ready-to-use brief. Research that used to take hours or days now takes minutes. In its first year, professionals ran roughly 35,000 of these insight chats.

Udemy

E-Learning · San Francisco, CA · ChatGPT Enterprise

Udemy is a ChatGPT Enterprise customer with around 9,000 employees. According to a job posting for a Senior Paid Search Marketing Associate on their Performance and Growth Marketing team, Udemy uses ChatGPT, Writer, and Canva on their paid search team. Writer handles ad copy and landing page content, Canva handles creative assets, and ChatGPT handles the analytical work: drafting test hypotheses, generating keyword lists, making sense of auction data, and pulling together competitive research.

DoorDash

Food Delivery & Logistics · San Francisco, CA · ChatGPT Enterprise + Claude

DoorDash is both a ChatGPT Enterprise customer and an Anthropic Claude customer, with around 38,000 employees. Both are deployed org-wide.

OpenAI published a case study on DoorDash's ChatGPT Enterprise rollout, covering finance, sales, operations, IT, and marketing teams. Two concrete examples stand out. Someone on the people ops team built a script to automate document uploads that had previously been done one by one manually. On the Finance and Strategy side, DoorDash built an AI workflow that pulls data from Google Docs, Google Sheets, Snowflake, and Slack to auto-generate recurring internal reports: business operations summaries, year-over-year trends, and daily growth numbers.

Both cases are employees with limited technical backgrounds shipping automation that previously would have required engineering support.

Running both tools at scale, DoorDash uses ChatGPT for general productivity across business teams, and Claude for more technical, code-heavy work where people are building things rather than just prompting.

Morgan Stanley

Financial Services · New York, NY · ChatGPT Enterprise · ~100,000 employees

Morgan Stanley has built three distinct GPT-4-powered tools for different parts of the firm, with unusually concrete adoption numbers to back them up.

AI @ Morgan Stanley Assistant launched in September 2023, giving wealth management advisors instant access to 100,000+ internal research reports and documents. Jeff McMillan, the firm's head of analytics, data, and innovation, called Morgan Stanley the first major Wall Street firm to put a bespoke GPT-4 solution in employees' hands. Document retrieval efficiency jumped from 20% to 80%. Zero data retention was a hard requirement from the start.

AI @ Morgan Stanley Debrief launched in June 2024. With client consent, it transcribes advisor-client meetings, extracts key points, drafts follow-up emails, and logs notes into the CRM automatically. Advisors onboard in under 30 minutes. By late 2025, 98% of wealth management advisors use it daily.

AskResearchGPT launched in mid-2024 for the institutional securities group. It lets analysts query Morgan Stanley's full research library (70,000+ proprietary reports annually) and export answers directly into email drafts with source links. Global research director Katy Huberty said employees were using it instead of calling or emailing the research department. Across all three tools, nearly 50% of Morgan Stanley's total workforce now accesses OpenAI-powered products.

AccuWeather

Weather Media · State College, PA · ChatGPT Enterprise · ~500 employees

AccuWeather is a ChatGPT Enterprise customer. Their editorial team uses ChatGPT as a standard part of the daily newsroom workflow: editing content, testing prompts, and optimizing weather stories for digital publishing on AccuWeather.com, one of the top 100 most-visited websites in the world.

A lot of their published content shows clear signs of AI generation. The screenshot above is a good example: generic phrasing, no byline, and writing patterns consistent with LLM output. For a company with ~500 employees covering weather 24/7 at global scale, using ChatGPT to generate and edit content at volume makes practical sense.

Grab

Super App · Singapore · ChatGPT Enterprise · ~11,000 employees

In May 2024, Grab announced a partnership with OpenAI described as the first of its kind for OpenAI in Asia. Part of the deal was a ChatGPT Enterprise pilot with select employees, aimed at boosting internal productivity. Chief Product Officer Philipp Kandal said the goal was to equip employees with the latest tools while building new experiences for users.

On the technical side, Grab's Content Moderation team uses ChatGPT alongside in-house ML models to evaluate and label user-generated content across text, image, and video for all of Grab's product lines. The team runs ChatGPT on high-traffic, low-latency infrastructure built in Go and Python, integrating it with their own models to flag harmful content and surface quality content across the platform.

Pfizer

Pharmaceutical Manufacturing · New York, NY · ChatGPT (custom deployment) · ~100,000 employees

Pfizer built an internal AI tool for pharma marketing called Charlie, a customized version of ChatGPT developed in collaboration with Publicis Groupe. Charlie is built on Publicis's Marcel AI platform and integrated directly into Pfizer's Adobe content management stack, including Adobe Workfront and Experience Manager, as well as Slack. The focus is compliant content generation: marketing materials, copy, and campaign assets that have to clear strict regulatory review. To prevent hallucinations, Charlie is configured to only answer based on Pfizer's validated content sources.

By 2025, hundreds of Pfizer marketers and external agency partners, including Publicis Groupe and IPG, were actively using Charlie, with deployment expanding to thousands of staff across multiple brands.

The job postings signal something broader: ChatGPT experience shows up as a preferred skill across Pfizer's global hiring, from clinical data managers and QC scientists to manufacturing team leaders, supply chain planners, EHS specialists, and administrative roles in China, India, Turkey, and Colombia. It's baked into their standard job description template worldwide, which suggests org-wide adoption policy rather than isolated team use.

Thomson Reuters

Legal, Tax & News Information · Toronto, Canada · ChatGPT + Open Arena · ~26,000 employees

After ChatGPT launched, Thomson Reuters built an internal platform called Open Arena in just six weeks: a privately hosted environment giving all employees secure access to a range of large language models. It now has more than 20,000 active users. Adoption was driven through "ideathons," hackathons, and accessible training.

On top of that, Thomson Reuters gave all employees access to ChatGPT directly in a secure environment for experimentation. They launched a company-wide AI learning day in April 2023, with over 6,000 employees attending live sessions on AI and machine learning basics. The recording of their AI 101 session has since been watched by more than 10,000 people. CTO Joel Hron described the approach as intentional: "There was a real hunger to get something in everybody's hands."

This is also a company that sells AI-powered products to the legal and tax professions, so internal fluency with the technology is part of the business case, not just an efficiency play.

Materials Market

Building Materials · UK · ChatGPT Business

Materials Market is a small UK building materials supplier and a ChatGPT Business customer. They've used it to build a customer-facing chat assistant called Kev, powered by OpenAI's Chatkit API, embedded directly on their website. Kev handles product advice, project advice, order placement, and order status checks. It's a good example of a small business using ChatGPT not as an internal tool but as customer-facing infrastructure, replacing what would otherwise be a live chat agent for common buyer questions like "what plasterboard do I need for this job?"

October Health

Mental Health & Wellbeing · ChatGPT Business

October Health is a workplace mental health platform that uses OpenAI's Chatkit API to power an AI support assistant embedded in their product. The chat history from their assistant shows the range of things users bring to it: therapy session booking, account issues, device pairing for fitness integrations, IV drip vouchers, adding dependents, and password recovery. It sits at an interesting intersection for ChatGPT usage: a small company using it to handle sensitive, personal interactions at scale rather than general productivity or internal tooling.