# Cerebras Shares Drop After Culper Research Claims Chip Lifespan Shorter

> Culper Research says Cerebras' AI chips fail within 2.5 years, dropping shares 4%.
- Title: Cerebras Shares Drop After Culper Research Claims Chip…
- Summary: Culper Research says Cerebras' AI chips fail within 2.5 years, dropping shares 4%. Culper Research alleges Cerebras' wafer-scale AI chips last only 1.5 to…
- Keywords: cerebras, culper research, wafer-scale chips, openai, net present value, gross margin, share price, ai chips, cerebras systems, paricon technologies, pariposer, cs-3
- Source: BigGo Finance — https://finance.biggo.com/news/89029659-9edd-40f1-ad41-75ad2c8f32fc
- Author: BigGo Finance
- Published: 2026-10-28T17:25:36+00:00
- Read time: 1 min
- Topics: cerebras, culper research, wafer-scale chips, openai, net present value, gross margin, share price, ai chips, cerebras systems, paricon technologies, pariposer, cs-3
## Cerebras Shares Slide
Cerebras Systems shares fell 4% on Wednesday after Culper Research disclosed a short position and published a report questioning the durability of the company's wafer-scale AI chips.
## Chip Lifespan Claim
Culper Research alleges the processors last only 1.5 to 2.5 years in service, undermining the company's business model.
## Connector Material Dispute
Culper disputes CEO Andrew Feldman's claim that the company invented a connector material to solve thermal expansion, saying it is PariPoser from Paricon Technologies.
## Dummy Computations
Culper claims Cerebras runs continuous dummy operations to prevent wafers from cooling, using a label found in client software.
## Accounting Shift
Culper flags a shift in useful-life assumption from 1.5 to 3 years to 3 to 5 years, recalculating first-half gross margin at 24.0% versus reported 29.9%.
## OpenAI Contract Risk
Culper estimates the December 2025 OpenAI contract could carry a negative net present value of up to $13.8 billion if wafers last 2.5 years.
## Share Release Timeline
19.4 million shares become eligible for sale Wednesday, with more than 50 million shares tradable in early November.
## Market Impact
Cerebras stock closed at $119.31 on Tuesday, about 36% below its $185 IPO price, after Oracle announced plans to make inference available.
## Consequence
Shorter-than-advertised chip lifespan pressures margins and future supply deals, adding selling pressure from lockup expirations.
## Key takeaway

Culper Research alleges Cerebras' wafer-scale AI chips last only 1.5 to 2.5 years, cutting gross margins and risking $13.8 billion negative net present value on OpenAI contracts.