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Wafer Raises $40 Million Series A at $200 Million-Plus Valuation After Declining Buyouts

September 1, 2026 at 13:04 EDT

Funding & M&A
AI Agents
Infra & Chips

Wafer, a year-old AI inference startup, has raised $40 million in Series A funding at a valuation of more than $200 million and turned down acquisition offers from larger inference and cloud providers. Marathon and Chemistry co-led the round, with participation from Wing, AMD Ventures, and Outset Capital. Existing backers Fifty Years and Y Combinator invested again.

September 1, 2026 · Wafer

$40M to make inference tune itself

The year-old startup closed a Series A at a $200M-plus valuation, declined buyout offers, and is using agents to retune models, engines, kernels, and chips in production.

$40M

Series A, co-led by Marathon and Chemistry

$200M+

Reported valuation after declining buyouts

80%

of Nvidia B200 throughput on AMD MI355X in tests

>2×

lower cost vs Blackwell in the same Wafer tests

Round size, drawn to scale

April seed versus today’s Series A — ten times more capital, five months later.

$4M

Seed · Apr 2026

$40M

Series A · Sep 2026

Same model, two chips

GLM-5.2 throughput in Wafer’s tests: AMD MI355X at 2,626 tok/s/node versus 3,192 on Nvidia B200 — about 80% of the speed at more than 2× lower cost.

80%

AMD MI355X · 2,626 tok/s

100%

Nvidia B200 · 3,192 tok/s

What backers cite

Customers compared Wafer with incumbents; a large platform plans to move all inference volume over. The team doubled after the investment. Founders had aimed for $18M and closed $40M.

The caution

Results are company tests. Nvidia still has the easier software path. Wafer is tiny beside that ecosystem, and AMD needed kernel and framework fixes to get near 80%.

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