Cerebras signs Microsoft as a cloud customer while its OpenAI deliveries run behind

A faster product and a bigger roster are not the same as delivering on time. On its 12 November earnings call, Cerebras said it signed a cloud deal with Microsoft, its third hyperscaler customer after AWS and Oracle. On the same call it said it is running behind on its biggest contract, with OpenAI.

Think of the fastest sprinter in the league signing with a third big club while the track for its biggest contract is still being poured. Cerebras says the problem is land, power and data center buildings, not chips.

The OpenAI deal is a take-or-pay contract for 750 MW of capacity. Take-or-pay means the buyer commits to pay for the capacity whether or not it uses it. Cerebras said delays give OpenAI credits, which it has already taken off its backlog, and that a delay of 90 days or more lets either side cancel that slice. It estimates less than 5% of committed megawatts could be open to cancellation this year, says none has been cancelled, and expects to be back on schedule by the second half of 2027.

On Microsoft, Cerebras gave no size or terms. It said it will share details in the first half of 2027, when it expects revenue to start. Microsoft has not commented.

Cerebras reported core revenue of $230.9 million for the quarter, up 70% from a year earlier.

All three companies are in our AI Economy Index. We file this as a new customer link from Cerebras to Microsoft, and a delivery note on the existing Cerebras and OpenAI link. No colour change.

What would change this read: Microsoft describing the deal in its own words, any cancelled OpenAI capacity, or Cerebras reporting its first large sites online.

This is general information, not investment advice.