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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 40–70%
Engine84%+29 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, 2028804 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%09-0709-0709-0809-1209-1209-1909-1909-2610-0310-1010-1710-1710-1810-1810-19deadline

Registered at 55% on September 8, 2026. Engine repriced 14 times; now 84%.

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 2026-10-19

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 · 35%

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.

34%

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

NVIDIA supplies one qualifying vendor. Using first-generation data-center switch launches moving from early access or announcement to explicit GA or volume production within 2–3 years as the reference class, I put Broadcom near 0.75 and at least one of Cisco, Marvell, or Arista near 0.60; allowing alternatives and correlation gives about 0.55 for the three-vendor rung. Conditional on that rung, I assign about 0.60 to a release explicitly naming an allowed hyperscaler as running CPO in production. Customer-name disclosure and exact wording are material failure modes. The Marvell revenue series is not outcome-specific, so the 0.98 structural prior gets little weight. The conjunction yields roughly 0.34.

43%

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

Reference class: first-generation datacenter networking platforms moving from demonstrations or early access to volume shipment, where qualification commonly slips several quarters. NVIDIA supplies one qualifying vendor, and Broadcom is likely to become the second by 2028. The harder step is a qualifying release from Cisco, Marvell, or Arista; Marvell may supply components rather than a complete switch, while system vendors may retain pluggables. Even if three qualify, publicly naming a specific hyperscaler as running CPO in production is an additional disclosure hurdle. The missing manual indicator and unresolved September milestone provide no confirmation. The revenue series is indirect and cannot justify the 0.98 structural prior. Strict wording and conjunctive resolution put this below 0.55.

35%

enterprise-cio · openai/gpt-5.6-sol

Reference class: merchant-switch hardware transitions from early access to explicitly announced volume production, where schedules commonly slip 12–24 months and customer names are often withheld. NVIDIA supplies one qualifying vendor; Broadcom looks likely to become the second, but reaching three requires Cisco, Marvell, or Arista to issue a precisely worded production release within 26 months. Pluggables remaining the volume default weakens that step. The named-hyperscaler clause is a separate, correlated hurdle: production can occur without a customer permitting disclosure. The revenue series is not CPO-specific, so the 0.98 structural prior is uninformative. I estimate 0.55 for the vendor count and 0.65 for public naming conditional on it, reduced for wording risk.

34%

credit-analyst · openai/gpt-5.6-sol

Using the reference class of datacenter-networking products progressing from early access to formally announced production over two years, I estimate the three-vendor leg near 0.55 after compounding launch hazards. NVIDIA already qualifies and Broadcom is plausibly second, but reaching three requires Cisco, Marvell, or Arista to ship true package-integrated optics with exact qualifying newsroom language. The separate disclosure leg is harder: hyperscalers often avoid naming production suppliers, while design wins, trials, and availability do not qualify. Arista’s revenue growth is not evidence of CPO production, making the structural prior inapplicable. The strict conjunction supports an estimate below the forecaster’s 0.55.

31%

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

Using first-generation networking-platform launches as the reference class, NVIDIA already supplies one qualifying vendor. Over the remaining 2.2 years, I estimate Broadcom has roughly a 0.72 chance of progressing from early access to qualifying production language, but the chance that at least one of Cisco, Marvell, or Arista also qualifies is only about 0.62, with correlated schedule risk. That puts the three-vendor leg near 0.50. Conditional on that leg, I assign about 0.62 to a release explicitly naming a permitted hyperscaler running the switch in production; confidentiality and strict wording create substantial resolution risk. The generic revenue trend and structural prior are not probative of CPO launch status.

34%

superforecaster-statistician · openai/gpt-5.6-sol

Base rate: I use 0.35 for emerging datacenter interconnect architectures achieving three qualifying vendor launches plus a publicly named production customer within roughly 27 months. NVIDIA already satisfies one slot and Broadcom’s early access supports a plausible second, but a third requires Cisco, Marvell, or Arista to meet exact production wording. I estimate the three-vendor leg near 0.52. Conditional on that, public identification of a hyperscaler is only about 0.65 because customers often remain undisclosed and the rule excludes trials and design wins. Their conjunction gives about 0.34. The revenue-derived 0.98 structural prior is not specific to CPO commercialization and receives negligible weight.

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