Anthropic got as far as putting a number on buying MatX, a startup that designs chips for artificial intelligence: roughly seven billion dollars. Then it walked away. Word of the talks came out on 27 August through people familiar with them, who add that the matter is not entirely closed: what is on the table now is a supply partnership rather than an acquisition.

What was discussed, and what is left

The deal advanced far enough to have a figure attached to it, which is exactly what makes it worth reporting. There is no announcement, no filing with any regulator and no confirmation from either side: Anthropic declined to comment and MatX did not respond to the enquiries it received. Nor has it been possible to establish what stopped the negotiation.

The detail that says most about the deal is the arithmetic. MatX is currently raising at a valuation of around four billion. The seven billion that was discussed sits roughly 75 % above what a private investor is being asked to pay today. That gap is the premium a buyer pays for two things: control and time.

Who MatX is

MatX is a small company with a very specific pedigree. It was founded in 2023 by Reiner Pope, who led AI software work for Google’s TPU units, and Mike Gunter, one of the lead designers of the hardware behind those same TPUs. Its product is not a general-purpose chip: these are processors built specifically to train large language models.

Its commercial argument is that a chip designed for a single workload can open a wide gap on an Nvidia GPU running that particular job. In February it closed a 500-million Series B led by Jane Street and Leopold Aschenbrenner’s Situational Awareness fund, with Marvell, Spark Capital and the Collison brothers also on the cap table. Volume shipments are planned from 2027.

Why Anthropic wants silicon of its own

This is not an isolated move. Anthropic confirmed earlier this year that it has an in-house chip design team, advertising for engineers who have already shipped silicon. In parallel it is in talks with Samsung about manufacturing a custom part.

The money moving around all this makes seven billion look modest. Broadcom is seeking more than sixty billion in debt to fund chips destined for Anthropic, and AMD has put five billion into the company alongside a two-gigawatt deployment commitment. The rest of the sector is heading the same way: Etched raised 500 million at a five-billion valuation, and accelerator startups as a group have taken in around 1.6 billion across five rounds this year.

Buy or sign: why the second option is not a retreat

Settling for a supply agreement follows a logic that has nothing to do with backing off. An acquisition would have handed Anthropic a design team and an integration problem at the same time, precisely when its priority is getting chips into data centres. A supply contract delivers the silicon without the org chart.

The maths works for MatX too. Staying independent lets it sell to the whole market, and a four-billion round is easier to raise as a supplier with several customers than as an asset whose only plausible buyer has already said no.

What the episode confirms

The labs at the frontier of AI have stopped being content as Nvidia customers, and the fastest route to an alternative runs through the handful of teams that have designed accelerators before. A seven-billion figure with no signed deal behind it also sets an informal ceiling against which the sector’s next negotiation will be measured.

Neither company has said anything publicly since, and there is no sign the partnership has been signed. The only firm thing, for now, is what actually took shape: there was a seven-billion purchase plan, and then there wasn’t.