Source: Inference provider Modal Labs closing in on $750M round at $15.75B valuation

What happened

AI inference infrastructure provider Modal Labs is advancing a new $750 million funding round led by Accel, which will value the company at $15.75 billion post-close. That represents a more than 3x jump from the $4.65 billion valuation it secured in its last funding round just four months prior. The company has declined to comment on the reported funding. Founded in 2021, Modal Labs currently has roughly 150 employees, surpassed $300 million in annualized revenue as of May of this year, and counts tech firms including Suno and Substack among its customers.

Key facts

Lead investor for this round

Accel

Size of this funding round

$750 million

Post-money valuation for this round

$15.75 billion

Valuation from the prior round (4 months ago)

$4.65 billion

Annualized revenue as of May of this year

$300 million

Key customers

Cognition, Suno, Ramp, Substack

Background

Demand for AI inference services is currently surging, particularly for open-source model inference use cases, and multiple startups in the space are closing high-valuation funding rounds. However, these firms typically face thin profit margins driven by high compute procurement costs.

Why it matters

This funding round reflects sustained high investor enthusiasm for the AI inference sector, with valuations across the space climbing rapidly in just a few months. For developers, this means a growing supply of inference service options, with expected gradual declines in model call costs. At the industry level, it will drive upgrades to inference infrastructure service capabilities to keep pace with fast-growing model deployment demand.

In their words

“We identified that a Modal customer had exposed an unauthenticated endpoint that let any internet user call their sandbox to run code. This is the type of vulnerability that out-of-control OpenAI agents could exploit; the Modal platform itself was never compromised at any point.”

Akshat Bubna, Modal Labs co-founder and CTO

What to watch

Going forward, track the final close of this funding round, financing progress for peer companies in the space, and whether inference firms can resolve the core challenges of high compute costs and thin profit margins.