Breaking

Baseten Acquires AI Agent Sandbox Startup Blaxel in Second Deal Since Hitting $13 Billion Valuation

September 11, 2026 at 13:19 EDT

Funding & M&A
AI Agents

Baseten, the AI inference platform last valued at $13 billion, said this week it has acquired Blaxel, a San Francisco startup that builds secure sandboxed execution environments for AI agents. Financial terms of the deal were not disclosed, and it marks Baseten's second acquisition since closing a $1.5 billion funding round in June.

September 2026 · Baseten

Baseten Buys Agent Sandbox Startup Blaxel

The $13 billion inference platform adds secure, fast-resuming sandboxes for AI agents in its second acquisition since June.

$13B

Baseten valuation (June 2026)

25ms

Blaxel sandbox suspend/resume time

$7.3M

Blaxel prior seed round

2nd

Acquisition since June raise

Sandbox resume speed vs. typical products

1×

Typical sandbox

5×

Blaxel resume speed

Developer reception

Praised for fast resume times, low idle cost and reliability at scale, including hundreds of millions of agent loops run by one customer.

Open questions

Sandbox market is crowded with E2B, Modal, Daytona and others; some see margins shifting toward the orchestration layer above.

Building the full agent stack

Baseten plans to collocate model inference with agent execution, storage and networking — following its December purchase of reinforcement-learning startup Parsed.

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