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Radar · Networking fabric · T2 · 2029 · CALL

Co-packaged optics ships from three vendors by 2028

By 2028-12-31 at least three of NVIDIA, Broadcom, Cisco, Marvell, and Arista have announced general availability or volume production of a switch with co-packaged optics (CPO) on their own newsrooms, and at least one names a hyperscaler production deployment.

CALLupindicators mixedregistered 2026-09-08NVIDIABroadcomCiscoMarvellAristaMicrosoftGoogleAmazonMetaOraclexAI

ClaimBy 2028-12-31 at least three of NVIDIA, Broadcom, Cisco, Marvell, and Arista have announced general availability or volume production of a switch with co-packaged optics (CPO) on their own newsrooms, and at least one names a hyperscaler production deployment.
Consensus (implied)45%implied from NVIDIA Q2 FY2027 earnings call remarks on Spectrum-X Photonics · 2026-08-26
Distance+0.40log-odds · leans above consensus
My confidence55%80% CI 4070%
Engine83%+28 pts vs me · stacked-fixed-weights
Falsifies ifOn 2027-12-31 only one of the five named vendors has a CPO switch in GA or volume production and no hyperscaler production deployment has been named.
HorizonDecember 31, 2028846 days · by end-2029 · milestone ladder

Why it matters

Pluggable optics are roughly a fifth of a modern AI cluster's networking power budget and the leading field-failure item. If three vendors ship CPO by 2028, per-rack power and cooling assumptions for 2029 buildings change, and the transceiver supply chain that grew with the buildout loses its volume growth.

Probability over time

0%25%50%75%100%09-0709-0709-08deadline

Registered at 55% on September 8, 2026. Engine repriced 2 times; now 83%.

Milestone ladder

Dated rungs. Each is scored on its own; the thesis does not get credit for the ladder until the rungs land.

0%50%100%2026-09-30m155%2027-06-30m265%2027-12-31m360%2028-12-31m455%

filled bar · my probabilityhollow dot · engineamber date · due, awaiting adjudication

m1 · 2026-09-30 · 55% · A second non-Broadcom vendor cites a 1.6T or co-packaged-optics hyperscaler design win. on the Ledger ↗

m2 · 2027-06-30 · 65% · Broadcom announces Tomahawk 6 Davisson (or successor CPO switch) in volume production.

m3 · 2027-12-31 · 60% · A hyperscaler is publicly named as running a CPO switch in production.

m4 · 2028-12-31 · 55% · Three of the five named vendors have CPO switches in GA or volume production.

Leading indicators

Registered thresholds. Status is computed from the latest public reading.

Vendors with CPO switch in GA or volume productionno data

count

21no data yet

on track >= 2 · off <= 1manual

connector returned no usable reading · checked 2026-09-07

Coherent quarterly revenue (optics demand proxy)between

1.81 USD billions

21.6

on track >= 2 · off < 1.6sec-xbrl

series as of 2026-03-31

What would move me

Would raise my number

  • Cisco or Marvell announce CPO switch sampling with a named hyperscaler before mid-2027.
  • Microsoft or Meta publish an engineering blog on CPO in production.
  • TSMC COUPE packaging capacity announcements exceed 2027 demand.

Would cut it

  • Field reliability issues (laser failures, serviceability) reported publicly on first-generation CPO.
  • 1.6T pluggable pricing falls faster than CPO cost, removing the economic case.
  • Broadcom delays Davisson volume production past 2027.

Council · 33%

6 personas on one model (openai/gpt-5.6-sol); other vendors were unavailable this run, so read this as one model's persona-averaged view.

30%

grid-and-power-planner · openai/gpt-5.6-sol

Start from one qualifying vendor. Using the reference class of early-access networking products reaching vendor-declared volume production, I assign Broadcom about 0.80 by the deadline, but only about 0.50 that at least one of Cisco, Marvell, or Arista issues the exact qualifying CPO-switch announcement within 27 months. Including paths where Broadcom misses but two others ship puts the three-vendor leg near 0.52. Publicly naming a hyperscaler as running the switch in production is an additional disclosure hurdle; conditional on three vendors, I put it near 0.58. That gives roughly 0.30 overall. The revenue-based structural prior does not measure CPO qualification, release wording, or customer disclosure.

38%

semiconductor-supply-chain-analyst · openai/gpt-5.6-sol

Reference class: leading-edge networking platforms commonly require 4–8 quarters to move from early access to production, with system-level CPO adding packaging, thermal, fiber-attach, and qualification risk. NVIDIA already satisfies one slot, and Broadcom is more likely than not to become the second by 2028. The third slot is less secure: Cisco, Marvell, or Arista must both commercialize a qualifying switch and use the resolution’s explicit production language on an official site. I estimate roughly 0.58 for the three-vendor count. Publicly naming a hyperscaler production deployment is a separate disclosure hurdle; conditional on three vendors, I assign about 0.65. The supplied revenue trend is not a meaningful CPO commercialization prior. Their conjunction yields about 0.38.

31%

enterprise-cio · openai/gpt-5.6-sol

Reference class: merchant-switch and optical-hardware transitions from early access to production. Over the remaining 2.3 years, I use roughly a 0.45 annual qualifying hazard for Broadcom and 0.12–0.18 for each of Cisco, Marvell, and Arista, discounted for correlated schedules and exact-wording risk. With NVIDIA already qualifying, that puts the three-vendor leg near 0.50. A specifically named hyperscaler production deployment is a separate, positively correlated but disclosure-constrained leg; customer confidentiality and strict “production” wording reduce the joint outcome to about 0.31. The revenue series and 0.98 structural prior are not causally informative about CPO qualification. The stated 0.55 underweights conjunction and documentation risk.

38%

credit-analyst · openai/gpt-5.6-sol

The relevant reference class is datacenter-networking products advancing from early access or demonstrations to explicitly documented production within two to three years. NVIDIA already qualifies, and Broadcom has a credible path from early access, but the thesis still needs a qualifying release from Cisco, Marvell, or Arista. Annual-hazard compounding provides time for that transition, yet exact newsroom wording and vendor-level system announcements create resolution risk. The named-hyperscaler production disclosure is an additional, correlated bottleneck because customers may deploy without permitting identification. The supplied revenue trend does not measure CPO commercialization and should not support the 0.98 structural prior. These conjunctive requirements put the estimate below the stated 0.55.

39%

geopolitics-policy-analyst · openai/gpt-5.6-sol

I use the reference class of networking hardware moving from early access to qualified volume production within roughly 2–3 years. NVIDIA already satisfies one slot, and Broadcom is a plausible second, but the thesis still requires Cisco, Marvell, or Arista to issue an expressly qualifying production announcement by end-2028. CPO’s operational complexity and continued preference for pluggables lower that transition rate. The separate customer-disclosure condition is material: hyperscalers often avoid naming production architectures, and design wins or trials do not qualify. Treating vendor count and named deployment as correlated but conjunctive yields a probability below the forecaster’s 0.55. The revenue-series structural prior is not technically specific to CPO and receives little weight.

24%

superforecaster-statistician · openai/gpt-5.6-sol

My reference-class base rate is 0.40 for a newly shipping switch technology to gain two additional qualifying vendors within roughly 28 months. NVIDIA already satisfies one slot and Broadcom’s early access improves the count leg, but Cisco, Marvell, or Arista must still cross the rule’s strict production threshold. I assign about 0.50 conditional probability that qualifying maturity also produces a timely newsroom disclosure naming a hyperscaler production user. Customer confidentiality and exact-source wording make disclosure harder than deployment itself. The generic revenue series and its 0.98 structural prior are not product-specific evidence. No calibration table was supplied for further correction.

Engine prior

98% from sec-xbrl-loglinear-bootstrap:li-2. log-linear growth +0.157/yr on the last 16 points, extrapolated from 2026-03-31; P(li-2 satisfies onTrack >= 2.0 at 2028-12-31); proxy for the thesis, not its rule