Mira Murati and several other former OpenAI researchers are behind the buzzy AI startup, now valued at $12 billion and officially out of stealth.

The round was led by venture capital firm Andreessen Horowitz and included participation from major industry players such as Nvidia, Accel, ServiceNow, Cisco, AMD, and Jane Street.

Thinking Machines, which was founded by its Chief Executive Murati in February, had reportedly been holding talks with investors since April, and had originally been talking about a $10 billion valuation, but that number has since shot up, and it’s now valued at $12 billion, it said today.