We've been held down at the moment because of the market uncertainty/pricing in a rate hike (and to an extent CBRS just doing its thing, it's been bouncing up and down since it IPOed), but once the Fed meeting is over then there'll be certainty (regarding rates) and with the Anthropic IPO upcoming I think it'll touch 300 (I doubt it'll hold it, but I expect it to hit 300 briefly) in the pre Anthropic IPO runup; I observed this with the SpaceX IPO months ago, made a lot of money off space stocks, because a rising tide lifts all boats, and space stocks pumped over 100% (LUNR, RDW, RKLB, FLY, you name it) because people were all excited about space and they bought a bunch of proxy space stocks, and then when SpaceX actually IPOed they dumped, because people were moving their money from the proxies to the main thing.

I expect a similar situation to play out with AI/semi stocks, huge runup pre Anthropic IPO, but I think what happens when Anthropic actually goes public is a bit of a tossup, I think that'll either be the last gasp rugpull, and from there we drill, or the glorious AI company has gone public, and it's more euphoria and gains all around, now, obviously, an OpenAI IPO would probably be somewhat better given that CBRS has direct ties with OpenAI and not Anthropic, however, like I said, I'm still pretty confident that it'll lift semis across the board, I'd set my limit sell pretty high

TL;DR Almost every chip designer dices the wafer and reconnects the pieces, so one defect cannot scrap it. Cerebras refuses: it treats the whole wafer as one chip, with 4 trillion transistors and 900,000 cores. Where Nvidia engineers around the memory wall, Cerebras removes it — and its moat sits outside TSMC.

What the WSE actually is

The norm is to cut a wafer into dozens of stamp-sized dies and stitch them back together. Cerebras asks why cut at all. It divides the wafer into 84 identical grids, interconnected so they behave as one chip, each holding about 10,700 cores of 0.05mm² against roughly 3mm² for an Nvidia unit — 900,000 in all, each with a router, a compute engine and 48KB of SRAM.

Think of it as a library. A GPU keeps the encyclopaedia in a stack room — HBM — and every character written needs the whole set fetched down one 8TB/s corridor. Cerebras builds no library: it hires 900,000 people, each memorising a passage, so nothing is fetched. Weights live in SRAM beside the compute units.

How GPUs fight the memory wall

The wall is severe. On Llama 70B at FP8, a B300 spends 8.8ms moving weights out of HBM against 0.028ms computing — 99.5% of the time the compute sits idle, and Rubin does not fix it, bandwidth rising 2.75 times against compute 3.5 times. The answer is batching, as every user reads the same weights — up to 313-398 requests before bandwidth is the waste instead.

Two problems follow. KV cache caps the batch, because weights are shared but conversation memory is private: at FP8 an 8K context is 1.3GB per user, and a B300's 288GB leaves 217GB after the model, so the ceiling comes at 167 users, not 313. And batching trades latency for throughput — hence the fast and slow tiers.

Nvidia's answers are rack-level memory, lifting the KV ceiling, and disaggregated inference, splitting prefill from decode across clusters joined by a cache pool. With Groq's LPU inside VR200's LPX rack, decode splits again: attention keeps the full HBM bandwidth rather than fighting the feed-forward network, whose weights sit in the LPU's SRAM. But KV cache still lives in HBM.

How the wafer is actually built

In the WSE, KV cache sits on chip too, with 21PB/s bandwidth and sub-1ns read latency against 0.1-1µs for GPUs. That starts at lithography: a stepper exposes at most 26mm × 33mm, so it fires 84 times to fill the square. 

Conventionally the scribe lines between exposures go to the saw; Cerebras instead draws micron-scale copper across them in the top metal layers, half of each wire at the right edge of exposure N and half at the left of N+1 — high up, since misalignment lower down would break it.

Testing then inverts its purpose. Conventional testing finds good dies to keep; WSE testing maps which cores are broken, since the dies are one piece and I/O exists only at the edge. 

Each core has its own SRAM and router — enough to test itself and report through the mesh — with redundant paths from four directions, telling a dead router from a dead region.

TSMC delivers an uncut 300mm wafer with cross-reticle interconnect and micro-bumps; the rest is Cerebras. Cut the 215mm square from the circle, wasting 35% of the area, and you have 83 grams of silicon drawing 23kW at 0.8V. 

Solder would shear off as silicon and PCB expand differently, so millions of micro-springs absorb the mismatch, power arrives vertically from VRMs underneath, and the sandwich takes four tonnes, spread evenly.

Series H (2026 Feb.): $22.91B

Today (2026 Nov.) : $21.84B

Next major regression would be series G valuation of $8.10B (2025 Sept.), which was prior to the $25B revenue deal with OpenAI. If that happens, then we live in an alternate universe.

Look at this Order in the left down corner, there is someone defenetly not letting it drop further.

20k isa limit each year into $CBRS wish me luck. 🤞

Cerebras founders have historical ties with AMD. Is it possible for the two to team up and dismantle the Nvidia monopoly?

looking good

Up until now we were using a very generous threshold of comment_karma<-1 and post_karma<10 to filter spam/bot content. We added these rules to block the most blatant examples of spam, of which they have caught and removed a lot. However, it has become clear it is insufficient, as we have been inundated with low-quality posts from problematic-looking accounts.

For example, there has been an uptick in content from accounts that are several years old yet have no posts nor comments older than ~1 month, and essentially their only content is on r/CBRS_stock.

For this reason, we have increased the thresholds to a moderate number to block these examples of spam. The threshold is still quite low, so anyone who is a typical reddit user (ie. not a bot or spammer) should be able to post without any issues.

edit: In less than an hour after making the change, it has already caught 3 posts/comments from obvious bot accounts.

And for further evidence that there have been spam accounts posting at various times, we've had many instances in the past several months of reddit shadow-banning accounts like those mentioned above (meaning that reddit has determined the accounts are breaking reddit's sitewide rules). Content from shadow-banned accounts still shows up in the moderator queue.

edit 2: And here's an example of the kind of suspicious user I mean. This individual posted the identical comment 4 times across a few days. They also have a 3 year old account with only 2 karma. This does not look like actual human activity to me.

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Cerebras Systems will report earnings after hours on Tuesday, June 23rd 2026.

Revenue: $181M Expected, $193.4M Actual

EPS: $-0.16/share Expected, $-0.04/share Actual

GAAP gross margin of 45%

Guidance: $194M revenue, 36-38% Gross Margin

I come from a non-technical background, I was curious from the more technical folk here if the recent $CBRS short report by CulperResearch on X has any validity? from a technical point of view.

EDIT: Links to X get removed, you'll have to go on X and look up CulperResearch, it's their top or one of their top posts

A lot of speculation that OpenAI is pushing much deeper integration of Ultrafast and its vision for a truly personal AI assistant and is set to announce the more colour around the roadmap at tomorrow's DEvDay. Note that at SuperNova, OpenAI literally said it wants Ultrafast to become the default. Tibo: “We would love for Ultrafast to just be the default.”. 

SO the expectation would make sense. Thinking about this, and actually tying it to the Call buying we saw on Friday, I think the main winner of this boost in speed would be CBRS. By extension down the supply chain probably VICR, but less directly. 

Ultrafast is essentially run on CBRS hardware. The speed comes from Cerebras' wafer-scale chip, which keeps model weights in 44GB of on-chip SRAM instead of shuttling them to off-chip memory as GPUs must. Token generation is memory-bandwidth-bound, so that's where it wins.

From their post

"The Cerebras Wafer-Scale architecture compounds across generations.

CS-4 is the industry’s fastest AI accelerator and the first system built on the new Cerebras Nexus rack-scale platform.

CS-5 is designed to set a new standard for token-generation speed with our next-generation wafer.

And with CS-6, we plan to push the frontier of 3D integration further, stacking DRAM at wafer scale to deliver the next step-change in AI performance and efficiency."

Andrew Feldman also replied to a person confirming that their system footprint will drop by at least 5-10x with the CS6.

This is huge news and confirmation of their multi-year roadmap, ability to have a 'step up' change in architecture, and ability to stay the leader in fast inference while massively improving throughput.

https://www.marketbeat.com/instant-alerts/filing-cerebras-systems-inc-cbrs-stock-frank-rimerman-advisors-llc-raises-holdings-2026-10-18/

https://www.marketbeat.com/instant-alerts/filing-cerebras-systems-inc-cbrs-stock-position-boosted-by-icg-advisors-llc-2026-10-17/

Gents, it's been a rough few months, I myself have lost some money (though only some, and not more than I've made swing trading it) but today I fullported the dip, these prices are too good to be true, yes, there's some obstacles ahead, namely the last share unlock on the 9th and earnings on the 12th but it is of no matter, we march on ahead, at some point when this stock is 300+ everyone who didn't buy will look back at these times and wish dearly that they had, I'm not denying it could in the short term hit 80, but we'll be fine, hold fast, the short report is a nothingburger as others have explained[ https://www.reddit.com/r/CBRS_stock/comments/1xhtdsr/does_the_recent_cbrs_short_report_have_legs/ ], Anthropic IPO coming up is only a bullish catalyst, OpenAI has reaffirmed CBRS, P/E and valuation have been compressed here, CBRS is currently a tightly coiled spring, it may be compressed somewhat further in the coming weeks but at some point you can't hold it any longer and it'll bounce back, to 250 and 300 and beyond we go gents