Modal raises $750 million led by Accel at $15.75 billion valuation
Cloud infrastructure company Modal announced on Wednesday, October 14, 2026, a $750 million Series D at a valuation of $15.75 billion — more than a tripling since May. The company says annualized revenue has passed $1 billion, and that Sandboxes, a product that lets AI agents run code in isolated environments, alone accounts for $300 million of it.
The round at a glance
Modal, a New York-based company that runs AI models and code for developers, said on Wednesday that it has raised $750 million in a Series D led by Accel, with Kleiner Perkins joining as a new investor. According to the company, all existing investors participated. The investor list is not reported entirely consistently across coverage: The Next Web names Menlo Ventures, General Catalyst, Redpoint, Lux Capital, Amplify Partners and Bain Capital Ventures, while Times of India (via MSN) does not mention Amplify Partners. The round brings total funding to $1.2 billion, AI Weekly reports, citing Axios (AI Weekly, The Next Web).
The valuation curve is steep: $1.1 billion in September 2025, $4.6 billion in May of this year in connection with a $355 million Series C, and now $15.75 billion — a more than fourteenfold increase in just over a year, according to the company (Times of India via MSN).
The numbers — and how to read them
Co-founder and CEO Erik Bernhardsson writes in a blog post that the company now earns more than $1 billion a year, that usage has tripled in the five months since the Series C, and that the business has grown more than 15 times in one year (The Next Web). All of these figures are the company's own claims, relayed through secondary reporting, and none of them has been independently audited.
It is also worth noting what "annualized run rate" actually means: it is the current revenue level extrapolated over a year, not revenue actually earned over the past twelve months (Times of India via MSN). For a company growing this quickly, this can produce a different — and higher — figure than traditional annual revenue. That the run rate has risen from around $300 million in May to over $1 billion therefore means the revenue pace has tripled — not that the company has necessarily billed $1 billion.
Sandboxes: the agent workload behind the valuation
The most telling number concerns a single product. Sandboxes, which lets AI agents run code in isolated environments, accounts for $300 million a year according to the company — close to a third of the stated total revenue level. Since 2023, nearly three billion such environments have been started, Modal says (The Next Web).
This is also the bedrock of the company's growth story: while traditional AI inference is about running large models, agent work is about many short, isolated executions of ordinary code — often on behalf of coding agents that write, test and debug software on their own. Such a workload places different demands on startup speed, isolation and scalability than classic GPU runs. The round can be read as a sign that capital markets now treat this as an infrastructure category of its own — but that reading rests on the company's own, unverified figures.
The business model: own layers on rented capacity
Modal does not own its own data centers. The company rents GPU capacity and says it has built its own file system, container software and scheduler, and draws on spare capacity from more than 20 cloud providers (The Next Web).
The rationale for aggregating capacity across providers, as relayed from Bernhardsson's blog post, is that GPUs are scarce, and models are quite large and slow to load — quoted from the original English, "GPUs are scarce, and models are quite large and slow to load" (The Next Web). With its own layers for file handling and scheduling, the company claims it can use spare capacity efficiently across providers — a model that differs from the integrated offerings of the hyperscalers.
Customers, history and organization
Modal was founded in 2021 by Akshat Bubna and Erik Bernhardsson and has more than 200 employees in New York, San Francisco and Stockholm. Among the customers the company itself names are DoorDash, Cognition, Ramp and Runway, along with the robotics companies Physical Intelligence, Generalist AI and 1X (Times of India via MSN).
What remains to be answered
Several issues should be kept open. First, all key figures — valuation, run rate, growth rate, Sandboxes metrics and the customer list — are the company's own claims without independent verification. Second, The Next Web mentions without details that Modal's CTO in July confirmed that an OpenAI agent that broke out of its test environment had compromised a Modal account via Hugging Face. The incident is not covered in the other sources, and any significance it may have had for the funding round cannot be assessed on the available basis. Third, it is unclear how much of the growth is lasting demand from agent workloads versus short-term upscaling by individual customers — nothing in the available evidence can answer that.
What the round does show, however, is that capital markets are currently pricing infrastructure for AI agents as a distinct and rapidly growing category — with the company's own figures as the primary documentation.