Modal Labs Closes $355 Million Series C at $4.65 Billion as Serverless AI Cloud Quadruples Revenue
The New York-based AI infrastructure startup grew annualized revenue fivefold to over $300 million in six months, fueled by the surge in AI-assisted coding.
Overview
Modal Labs, the New York City-based serverless AI infrastructure startup, announced on May 22, 2026 that it has raised a $355 million Series C at a $4.65 billion post-money valuation, according to Modal’s own announcement. The round was led by General Catalyst and Redpoint, with Menlo, Bain Capital Ventures, and Accel joining as new investors. The financing comes after Modal surpassed $300 million in annualized revenue, having grown fivefold since September 2025 — a trajectory that SiliconANGLE traces to the rapid enterprise adoption of AI coding tools.
What We Know
The funding round. The Series C was structured in two tranches, with the first priced at a $2.5 billion valuation and the second pushed higher to the final $4.65 billion post-money figure, per SiliconANGLE and Tech Startups. General Catalyst and Redpoint each gained board seats with the closing, according to Let’s Data Science. All existing major investors also participated, doubling down on their prior conviction.
This Series C follows the company’s $87 million Series B, raised in October 2025 and led by Lux Capital, which valued the company at approximately $1.1 billion, per Tech Startups. The new round puts Modal’s valuation at more than four times that level in under a year.
Revenue and growth. Modal has surpassed $300 million in annualized revenue, up from approximately $60 million in September 2025, representing a fivefold increase in about six months, per Modal’s announcement and SiliconANGLE. CEO Erik Bernhardsson attributed the surge to the explosion in AI-assisted developer tooling: “The last six months have been driving everything,” he told SiliconANGLE.
What Modal builds. Founded in 2021 by Bernhardsson and CTO Akshat Bubna, according to Benzinga, Modal built its platform around the premise that traditional cloud infrastructure designed for web applications was never going to fit AI workloads. The platform provides serverless access to GPUs for inference, reinforcement learning, and large-scale batch jobs, without developers having to manage underlying server infrastructure. Benzinga reports Modal can scale from zero to 1,000 GPUs within minutes and works with 13 cloud infrastructure providers, up from five previously.
Sandboxes. A particularly fast-growing product line is Modal’s sandbox environment, first launched in 2023, which allows developers to run untrusted AI-generated code in isolation before sending it to production. The company has now launched over 1 billion sandboxes in total, and sandboxes now account for more than one-third of revenue, per Benzinga and Modal’s blog.
Customer base. SiliconANGLE describes Modal’s client base as spanning from biotechnology firms to hedge funds and even weather forecasting startups. Prominent customers quoted in Modal’s announcement include Cognition, DoorDash, Physical Intelligence, and Applied Compute. Scott Wu, CEO of Cognition, said: “Modal powers both our reinforcement learning infrastructure and production inference. Millions of sandboxes on one end, real-time serving on the other.” Brian Ichter, co-founder of Physical Intelligence, noted: “We use Modal to run edge inference with <10ms overhead and batch jobs at large scale.” Andy Fang, CTO of DoorDash, stated: “As we scale agentic commerce for local businesses, we need a highly efficient path to production with full harness control, scale, and reliability.”
What We Don’t Know
Modal has not disclosed individual customer counts or the breakdown of revenue between its inference, sandbox, and batch-processing product lines beyond the disclosure that sandboxes exceed one-third. The company has not named which of its 13 cloud infrastructure partners are new additions since September. The amount raised in the first versus second tranche of the Series C has not been published. Modal’s path to profitability and current burn rate have not been publicly discussed.
Analysis
Modal’s growth arc — from $60 million to over $300 million in annualized revenue inside six months — is unusual even by the standards of the current AI infrastructure boom. The driver Bernhardsson identifies is AI-assisted coding: as tools like Claude Code and similar products make AI-generated code generation routine, the demand for infrastructure that can safely execute and serve that code at scale has surged in parallel. Modal’s sandbox product, which runs untrusted AI-generated code in isolated environments before production, is directly positioned at this inflection point.
The valuation trajectory is equally notable. A $1.1 billion valuation in October 2025 became $4.65 billion by May 2026 — a roughly fourfold jump backed by a set of investors (General Catalyst, Redpoint, Bain Capital Ventures, Accel, Menlo) who collectively represent some of the most active capital in enterprise software. The fact that both lead investors took board seats signals a depth of conviction beyond a passive financial bet.
Modal competes in an increasingly crowded AI cloud infrastructure space alongside companies like Replicate, Together AI, and established hyperscalers offering GPU-as-a-service, but its early bet on sandboxes and agentic workloads may be differentiating it as agent-driven software becomes the norm rather than the exception.