---
id: "2026-10-13-anthropic-acquires-opaque-systems"
url: "https://postcutoff.com/e/2026-10-13-anthropic-acquires-opaque-systems/"
as_of: "2026-10-19T13:50:00+02:00"
date: "2026-10-13"
date_precision: day
category: business
importance: 3
confidence: high
status: [Confirmed]
sources: 3
editor: human editor
human_review: null
version: "2026-10-19"
---

As of: 2026-10-19 13:50 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-10-13-anthropic-acquires-opaque-systems/

# Anthropic acquires Opaque Systems (confidential and verifiable AI)

Full title: Anthropic acquires confidential-AI startup Opaque Systems; Opaque's team joins Anthropic and the company winds down

On Oct 13, 2026 Opaque Systems, a UC Berkeley RISELab spin-out that built confidential-computing and "verifiable AI" tools (cryptographic evidence of what an AI system ran, where and under which policies), said its team is joining Anthropic and the company is winding down. SecurityWeek reported it on Oct 19 as an acquisition; terms were not disclosed.

## Key facts
- Opaque's statement (opaque.co, post 'OPAQUE's Next Chapter', Oct 13): 'Our team is joining Anthropic to carry our work forward, and OPAQUE Systems is winding down its operations.' The post has no individual byline
- Terms: not disclosed (SecurityWeek, Oct 19). We found no Anthropic announcement of the deal; anthropic.com/news lists none as of Oct 19
- What Opaque did: started about a decade ago as a UC Berkeley RISELab project on keeping data private while in use (confidential computing), then moved into 'verifiable AI'. Open-source work it lists: AgenTrust, Agent Governance Toolkit, TRACE, Confidential MCP and Weight Custody Manifest (Opaque; SecurityWeek)
- People (SecurityWeek): co-founders Ion Stoica (Databricks and Anyscale co-founder) and Raluca Ada Popa (now at Google DeepMind); CEO Aaron Fulkerson since October 2023
- Funding (SecurityWeek): a $24M Series B this year at a $300M valuation; customers it listed included Anthropic, ServiceNow and Accenture
- Open question: neither Opaque nor SecurityWeek says what happens to existing customers or to the open-source projects

## What happened

Opaque Systems posted on Oct 13, 2026 that its team "is joining Anthropic to carry our work forward" and that the company is
winding down. SecurityWeek covered it on Oct 19 as an acquisition by Anthropic with undisclosed terms. Opaque grew out of UC
Berkeley's RISELab (co-founded by Ion Stoica and Raluca Ada Popa) and sold confidential-computing tools that let AI systems
work on sensitive data while hardware keeps it protected. It later turned to "verifiable AI": cryptographic evidence of what an
AI system ran, where and under which policies, with open-source projects for agent governance, confidential MCP and model
weight custody. It had raised a $24M Series B at a $300M valuation this year and counted Anthropic among its customers.

## Why it matters

It is a small team acquisition, but its subject matters to Anthropic: protecting model weights and customer data, and proving
to customers and governments what an agent actually did. Anthropic has not explained the deal itself, so how it will use the
team is not known.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 166 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 105 days after its cutoff
- Gemini 4 Argon (training cutoff March 2026): 196 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 135 days after its cutoff

## Sources

1. [Opaque: From Berkeley research to the future of AI, OPAQUE's next chapter (Oct 13)](https://www.opaque.co/resources/articles/from-berkeley-research-to-the-future-of-ai-opaques-next-chapter) (opaque.co, official)
2. [Opaque home page: team joining Anthropic, company winding down](https://www.opaque.co/) (opaque.co, official)
3. [SecurityWeek: Anthropic Acquires Confidential AI Startup Opaque Systems (Oct 19)](https://www.securityweek.com/anthropic-acquires-confidential-ai-startup-opaque-systems/) (securityweek.com, press)

## Changes

- 2026-10-19 (filed): Created (SecurityWeek, Opaque's post)

## Related

- 2026-10-15: [Anthropic gives METR employee-like access and veto-free publication rights](https://postcutoff.com/e/2026-10-15-anthropic-metr-employee-level-access/index.md)
- People: [Ion Stoica](https://postcutoff.com/person/ion-stoica/)