Modal Raises $750M Funding at $15.75B Valuation to Build Cloud Infrastructure for AI Agents

Modal, the New York-based serverless cloud platform for AI workloads, has raised $750 million in Series D funding at a $15.75 billion valuation—more than tripling its valuation in just five months. The round was led by Accel, with Kleiner Perkins joining as a new investor and all existing backers participating, including Menlo Ventures, General Catalyst, Redpoint, Lux Capital, Amplify Partners, and Bain Capital Ventures.

The funding comes as Modal crosses $1 billion in annualized revenue run rate, up from approximately $300 million in May 2026. Usage has tripled in five months, and the business has grown more than 15x year-over-year.

Modal Funding Overview By CREDX Media

Startup Name	Modal
Founders	Erik Bernhardsson (CEO), Akshat Bubna (CTO)
Founded	2021
HQ	New York, USA
Round	Series D Funding
Amount Raised	$750M
Valuation	$15.75B
Category	AI Infrastructure, Serverless Cloud, Agent Execution
Lead Investor	Accel
New Investor	Kleiner Perkins
Returning Investors	Menlo Ventures, General Catalyst, Redpoint, Lux Capital, Amplify Partners, Bain Capital Ventures
Total Funding Raised	~$1.2B+
Employees	200+
Key Product	Modal Sandboxes
Sandboxes Revenue	$300M annualized

💡 Use of Funds

• Product Development: Launching services focused on reinforcement learning and post-training.
• Infrastructure Scaling: Expanding sandbox capabilities and concurrent execution capacity.
• Team Growth: Hiring across New York, San Francisco, and Stockholm.

Startup Overview: Modal

What Modal Is Building in Simple Words

Modal has built a serverless cloud platform purpose-built for AI workloads. Developers write Python functions, and Modal handles the infrastructure—scaling from zero to thousands of GPUs in seconds, without reservations or capacity planning.

The company’s fastest-growing product is Modal Sandboxes—isolated environments where AI agents can run the code they generate. As AI agents become more capable, they need secure places to execute code, install dependencies, run tests, and modify software projects. Modal provides that execution layer.

• Serverless GPU Access: Developers decorate a Python function and Modal scales it across 20+ cloud providers, pooling spare capacity.
• Sandboxes for AI Agents: Isolated containers (using gVisor) where agents run untrusted code. Sandboxes have launched nearly 3 billion instances since 2023 and now drive $300 million in annualized revenue—nearly a third of Modal’s total.
• Custom Infrastructure: Modal built its own file system, container software, and scheduler from the ground up. Its scheduler recently demonstrated 1 million concurrent sandboxes.
• Multi-Cloud Redundancy: Modal owns no GPUs. It rents capacity from more than 20 cloud providers and can shift workloads if one experiences issues.

Why Modal Matters

1. AI Agents Need a Place to Run Code As AI agents evolve from chatbots to autonomous workers, they need secure environments to execute code, test changes, and complete multi-step tasks. Modal Sandboxes provides that infrastructure. CEO Erik Bernhardsson frames the shift: “AI has entered a new era of software” where agents will take on longer-running tasks.
2. The AI Infrastructure Market Is Exploding Accel calls the infrastructure to train, serve, and run AI “the fastest growing market in technology,” noting the industry is “only in the very early stages of building that infrastructure”.
3. Revenue Growth Validates the Model Crossing $1 billion in annualized run rate—up from $300 million in May—demonstrates that developers are choosing Modal for production workloads. Customers include DoorDash, Ramp, Linear, Cognition, and robotics firms Physical Intelligence and 1X.
4. Lean Team, Massive Scale Modal operates with just over 200 employees, generating $1 billion in revenue. Its valuation prices the orchestration layer of AI—the software that keeps other people’s GPUs utilized—rather than owning silicon itself.

Startup Story: From Serverless Ambition to AI Agent Infrastructure

Modal was founded in 2021 by Erik Bernhardsson and Akshat Bubna. Bernhardsson previously served as CTO at Better.com and led data infrastructure at Spotify. Bubna was raised in Delhi, is an Olympiad gold medallist, and studied computer science before co-founding Modal.

The founding thesis was that cloud infrastructure built for web apps didn’t fit AI workloads. Traditional clouds require capacity reservations, slow cold starts, and manual scaling. Modal built something different: a serverless platform where Python functions scale instantly to thousands of GPUs, with no infrastructure management.

The pivot to AI agents came in 2023, when developers began using language models to generate executable code. Modal built Sandboxes to run that code safely in isolated environments. The product took off as AI agents moved from demos to production.

By 2026, Sandboxes had become Modal’s fastest-growing product. The company crossed $300 million in annualized revenue in May, then $1 billion by October. Valuation followed: $1.1 billion in September 2025, $4.65 billion in May 2026, $15.75 billion in October 2026.

Bernhardsson wrote in a blog post announcing the round: “Just five months ago, when we announced our Series C, I wrote that demand was accelerating. Since then, usage has tripled and we’ve grown more than 15x year-over-year. We recently crossed $1B in annualized run rate with no sign of slowing down”.

Founder Background: The Spotify Alum and the Olympiad Gold Medallist

Erik Bernhardsson (CEO) brings deep infrastructure experience from Spotify, where he led data infrastructure, and Better.com, where he served as CTO. His blog post announcing the Series D reflected on the pace of change: “GPUs are scarce, and models are quite large and slow to load”.

Akshat Bubna (CTO) was raised in Delhi and is an Olympiad gold medallist. He studied computer science before co-founding Modal. His technical leadership shaped Modal’s custom scheduler, file system, and container software—the foundation for its 1 million concurrent sandbox demonstration.

The founding team’s combination—Bernhardsson’s infrastructure scaling experience and Bubna’s deep technical capability—positions Modal to navigate both the commercial and engineering challenges of AI cloud infrastructure.

The AI Agent Infrastructure Race Nobody Expected

Modal operates in a market that is simultaneously nascent and intensely competitive.

Traditional cloud providers including AWS, Google Cloud, and Microsoft Azure offer GPU instances but require capacity planning and infrastructure management.

AI-native competitors including E2B focus specifically on sandbox execution for AI agents. E2B uses Firecracker microVMs for stronger isolation, while Modal uses gVisor containers. E2B lacks GPU support; Modal’s sandboxes support GPUs natively.

Modal’s differentiation is the combination of serverless GPU access and sandbox execution at massive scale. Its custom scheduler parallelizes container provisioning across servers, enabling 1 million concurrent sandboxes in internal testing. Modal says it can provision tens of thousands of containers per second.

The competitive moat, if it materializes, is developer experience plus scale. Modal’s Python-first API and instant scaling reduce friction. Its 20+ cloud provider relationships provide capacity flexibility that single-cloud providers cannot match.

Founder Intelligence: What Founders Can Learn from Modal

• Build infrastructure for the next workload, not the current one: Modal built serverless GPU infrastructure before AI workloads were mainstream. When agents arrived, the platform was ready.
• Let customers pull you into new markets: Sandboxes started as a feature in 2023. By 2026, it was driving a third of revenue. Modal followed developer demand into agent infrastructure.
• Own the orchestration layer, not the silicon: Modal owns no GPUs. It rents from 20+ providers and builds the software that makes them useful. This asset-light model scales without capital expenditure.
• Revenue growth attracts capital at any valuation: Modal’s 15x year-over-year growth and $1 billion run rate justified a 3.4x valuation increase in five months. Growth is the ultimate fundraising asset.

Investor Intelligence: Why This Round Gets Premium Capital

Accel led the round. Partners Rich Wong and Gonzalo Mocorrea framed the thesis: “The infrastructure to train, serve and run AI is the fastest growing market in technology… As the market evolves from ‘AI-natives’ to every company using AI tools, Modal provides the building blocks for the smallest startups to the largest companies in the world”.

Kleiner Perkins joined as a new investor, bringing decades of enterprise infrastructure experience. All existing investors returned, signaling continued conviction in Modal’s trajectory.

The valuation trajectory tells the story: $1.1 billion (September 2025), $4.65 billion (May 2026), $15.75 billion (October 2026). Each round was justified by revenue growth that exceeded even optimistic projections.

The Road Ahead for Modal

Expansion Targets

With $750 million in capital, Modal will:

• Launch services focused on reinforcement learning and post-training.
• Expand Sandboxes capabilities, including granular RBAC for agent permissions.
• Scale concurrent execution capacity beyond the 1 million sandbox demonstration.
• Grow the team across New York, San Francisco, and Stockholm.

Competitive Response

Expect:

• AWS, Google Cloud, and Azure to deepen serverless GPU offerings
• E2B and other sandbox providers to add GPU support
• New startups targeting specific agent execution niches
• Modal’s moat: serverless GPU access + sandbox scale + multi-cloud redundancy

Conclusion

Modal’s $750 million Series D at a $15.75 billion valuation validates the thesis that AI agents need purpose-built execution infrastructure. The company’s $1 billion run rate, 3 billion sandboxes launched, and 200-person team demonstrate that the orchestration layer of AI is a massive business.

Market tailwinds favor Modal: AI agents moving into production, demand for secure code execution, and the broader infrastructure buildout that Accel calls “the fastest growing market in technology”. The company’s serverless model and multi-cloud capacity position it to capture this opportunity as agents become the dominant compute consumer.

For deep analysis of AI infrastructure funding, agent execution platforms, and companies reshaping cloud computing, explore CREDX Media for comprehensive coverage of startup funding trends, valuation intelligence, and founder playbooks.

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Frequently Asked Questions

1. What is Modal’s total funding and latest round size?
Modal has raised approximately $1.2 billion+ total. Its $750 million Series D was led by Accel in October 2026.

2. How much did Modal raise in its Series D round and who led the investment?
Modal raised $750 million led by Accel, with Kleiner Perkins joining and all existing investors participating.

3. What is the valuation of Modal?
Modal is valued at $15.75 billion following its Series D round, more than triple its $4.65 billion valuation from May 2026.

4. Who are the major investors in Modal?
Major investors include Accel (lead), Kleiner Perkins, Menlo Ventures, General Catalyst, Redpoint, Lux Capital, Amplify Partners, and Bain Capital Ventures.

5. Who are Modal’s founders?
Modal was founded in 2021 by Erik Bernhardsson (CEO) and Akshat Bubna (CTO). Bernhardsson previously led data infrastructure at Spotify; Bubna is an Olympiad gold medallist raised in Delhi.

6. What is Modal’s business model?
Modal operates a serverless cloud platform, charging per second of compute usage. Its Sandboxes product runs isolated containers for AI-generated code, priced at a premium to general serverless functions.

7. How does Modal’s Sandboxes work?
Modal Sandboxes are isolated containers (using gVisor) where AI agents run untrusted code. They support GPU access, scale to tens of thousands of concurrent instances, and have launched nearly 3 billion instances since 2023.

8. What traction justifies Modal’s $15.75 billion valuation?**
Modal has crossed $1 billion in annualized revenue run rate, up from $300 million in May 2026. Usage has tripled in five months, and the business has grown 15x year-over-year.

9. What are Modal’s plans for the $750 million Series D capital?
Modal will launch reinforcement learning and post-training services, expand Sandboxes capabilities, scale concurrent execution capacity, and grow its team across New York, San Francisco, and Stockholm.

10. Who are Modal’s key customers?
Modal’s customers include DoorDash, Ramp, Linear, Cognition, Runway, Physical Intelligence, 1X, Suno, and Decagon.

11. Who is the CEO of Modal?
Erik Bernhardsson serves as CEO and co-founder. He previously served as CTO at Better.com and led data infrastructure at Spotify.