What Is GPU Cluster Acceptance? Why the Bill Starts After the Test
GPU cluster acceptance is the customer's sign-off that a rack of GPUs passed the tests in the contract. The monthly fee starts then, and silence during the short test window can count as a yes.
EXPLAINED · Mechanism · Last reviewed: 3 Nov 2026 · Next review: when IREN reports whether Horizon 2 was accepted
GPU cluster acceptance is the customer's sign-off that a rack or a tranche of GPUs has passed the tests written into the contract. The monthly fee for that capacity starts on that sign-off. A signature, a powered hall and a rack that is only installed are earlier steps on the same clock.
In short. Acceptance is the gate between metal in a hall and a monthly GPU bill. On the contracts IREN filed with Microsoft and Boost Run filed with Cohere, the customer gets a few days to test, silence can count as a yes, and a failed test opens a cure before any monthly fee. Our read: the neocloud's monthly fee starts after the test. The chipmaker, the landlord and the lender can be paid while that test is still ahead. The stuck step is acceptance.
A signed contract is the promise. Our guide to GPU clusters and our guide to take-or-pay cover the rack and the bill. This page is the gate between them.
What is GPU cluster acceptance?
It is the customer's confirmation that delivered GPUs meet the tests in the contract. Delivery puts the machines in the hall. Acceptance says those machines passed.
The on-switch is not the same at every neocloud. IREN's annual report says cloud revenue generally begins only after the compute has been delivered, commissioned, placed in service and accepted, where the contract requires acceptance. Boost Run's agreement with Cohere says the monthly fee for a rack accrues from acceptance or deemed acceptance, and that no monthly fee is due before then. CoreWeave's quarterly report says a committed contract generally starts on a fixed date, or when CoreWeave delivers the capacity the contract names. That filing does not publish a customer's test window.
The sign-off can be a letter, or it can be deemed: silence, or a production workload, counts as a yes.
What does the test check?
The operator tests first. The customer tests second. The public contracts name the kind of test and redact the pass mark.
Before Microsoft is invited in, IREN's contract requires GPU diagnostics, performance tests including HPL-MxP and HPCG, and network tests including NCCL, which measures how fast the GPUs talk. Our Players page on cluster networking covers that fabric. Microsoft then has five days. Until a minimum GPU quantity is ready to test, silence is not acceptance. The minimum is redacted.
Boost Run's report, from Nvidia or Nvidia's NVIS team, checks the GB300 NVL72 reference design, NCCL results and a reference model run. The test uses an unmodified rack, before the customer's own software or storage. Cohere then has seven business days. Later uptime sits in the service-level agreement, not in this one-time report.
When does the monthly fee start?
| IREN and Microsoft | Boost Run and Cohere | CoreWeave, in the 10-Q | |
|---|---|---|---|
| Window opens | After the supplier's tests, once a minimum GPU quantity is ready | Ready-for-test notice plus an Nvidia report | A fixed date, or delivery of the named capacity |
| Customer has | Five days | Seven business days | Not described |
| Silence | Deemed acceptance, after that minimum is in the test | Deemed acceptance. A production workload counts. A test-only run does not | Not described |
| If it fails | Fifteen business days to cure, then the loop repeats | Twenty business days, a new seven-day window, then one further twenty-business-day fix | Not described |
| Monthly fee | Starts once the minimum for that tranche is accepted. Unaccepted GPUs stay off the bill | Accrues on acceptance of that rack. Nothing monthly is due before | Term starts on the fixed date or at delivery |
IREN Exhibit 10.3, filed 5 February 2026; Boost Run agreement filed 30 September 2026; CoreWeave quarterly report for the quarter ended 30 June 2026. Pass marks and minimum quantities are redacted.
IREN's upfront is a separate clock. The supplier may invoice 20% of a tranche before delivery, with no interest, credited against fees after month 24. Our check: upfronts in the exhibit add to $1,932,839,884.80 and tranche values to $9,664,199,424.00, a ratio of 20%. The fee cap in the same exhibit is $9,666,845,337.60. The 13 August 2026 release describes the contract as five years and $9.7 billion for four 50 MW sites at Childress, Texas. Our check: the cap is $9.67 billion, which rounds to that $9.7 billion. Each tranche's service term begins when Microsoft accepts the minimum. The statement of work was signed on 31 October and 2 November 2025. The GPU-hour price is redacted.
At Boost Run, each rack's term is about five years and starts on Cohere's acceptance of that rack. The commitment is about $525.6 million, subject to delivery and acceptance, part of it prepaid. Money due at signing is payable at signing. Later prepayment instalments follow the GPUs in each accepted rack. Our Wire note on the signing covers the announcement.
CoreWeave states the gate in accounting words. Revenue was $2,575 million in the quarter ended 30 June 2026, and 98% came from customer commitments, including capacity delivered early. Remaining performance obligations were $103.7 billion, net of an estimate for delivery slips. The size of that estimate is not disclosed. Our guide to remaining performance obligation covers the wider remainder.
Who gets paid — and where is the stuck step?
Our read: the monthly GPU fee waits on acceptance. Other bills do not.
- Chipmakers, when the neocloud buys the trays. Nvidia's validation report is a handover document, not the monthly fee.
- The landlord, from lease commencement. CoreWeave's prepayments on certain data-center leases were $108 million at 30 June 2026, and rent follows construction cost the landlord has incurred. The hall can bill the neocloud while the customer's GPU fee is shut. Where IREN accounts for a contract as a lease, that lease starts on customer acceptance. Our guide to data-center leases covers the hall.
- Lenders, during the build. CoreWeave capitalized $79 million of interest in the quarter ended 30 June 2026. Interest does not wait for an acceptance notice.
- The neocloud, when the monthly fee starts. After that switch, both customer contracts bill reserved capacity whether or not it is used. Take-or-pay is the form. Acceptance is the day it turns on.
Cash can arrive earlier and sit unearned. CoreWeave's deferred revenue was $9.7 billion at 30 June 2026. Of the $8,185 million at year-end 2025, $554 million was recognized in the first half of 2026. Our arithmetic: 554 ÷ 8,185 is about 6.8%, so most of that balance was still unearned. The months before the short test window are power, a building and a clean report. Our guide to contracted power is that earlier clock.
What if the rack fails, or arrives late?
A failed test starts a cure. It does not, by itself, cancel the contract, and the customer has to name the failure.
At IREN the cure is fifteen business days, and the loop repeats. A late start moves the end date of every tranche so the total still targets the cap. There is a late-delivery fee. The amount is redacted, so we do not print one. Termination is what cuts the cap.
At Boost Run the outside date does not move. It is 15 July 2027, 254 days from this review. If a stated minimum is still unaccepted, Cohere may terminate and take the prepayment back. The parent guarantees that refund, up to prepayment not yet applied to fees. The minimum count is redacted. Initial acceptance is expected in the second quarter of 2027. Fees on racks already accepted keep running.
Why is contracted capacity ahead of operating capacity?
Contracted means signed. Operating means the GPUs are commissioned and in the bill. Acceptance sits between them.
IREN's 27 August 2026 results put contracted annualised run-rate revenue for 2026 capacity at $4 billion, and operating annualised run-rate revenue at $1 billion as of 26 August. Our arithmetic: three-quarters of the contracted figure was not operating. IREN says neither number is GAAP revenue, and that the $4 billion still has to clear commissioning, testing and customer acceptance. Horizon 1, the first of the four 50 MW deployments, was accepted on 13 August 2026. As of 27 August, Horizon 2 was being commissioned and Horizons 3 and 4 were in late-stage construction, aimed at the fourth quarter. This page's next review is that report.
Nvidia Exemplar Cloud status, announced the same day, is a badge, not Microsoft's acceptance notice.
What would change the view?
- Horizon 2, 3 and 4 are accepted on the August timetable. Operating annualised revenue would move toward the $4 billion figure.
- New contracts bill from signature, with no delivery gate. The test would stop being where the money waits.
- A filing counts rejected racks. The contracts allow rejection. These filings do not say how often it happens.
Common misconceptions
- People assume the signature starts the monthly fee. At IREN and Boost Run it starts at acceptance or deemed acceptance. At CoreWeave a committed term starts on a fixed date or at delivery.
- People assume an installed rack is an accepted rack. Installed means the hardware is in the hall. Accepted means the customer's window has closed in the operator's favour. The validation report comes first.
- People assume silence is a no. On both customer contracts, silence in the test window is a yes. On the Microsoft contract that rule stays off until the minimum quantity is ready to test.
- People assume the upfront is the monthly fee. IREN's 20% is invoiced before delivery and credited after month 24. Boost Run can collect money at signing that is refundable if the outside date is missed.
FAQ
What is GPU cluster acceptance?
GPU cluster acceptance is the customer's sign-off that a rack or a tranche of GPUs has passed the tests in the contract. The monthly fee for that capacity starts then. A signature and an installed rack are earlier steps.
When does the monthly GPU fee start?
On the IREN contract, monthly invoices start once Microsoft has accepted at least the minimum GPU quantity for that tranche. On the Boost Run contract, the fee accrues when Cohere accepts the rack or is deemed to have accepted it. CoreWeave says a committed term starts on a fixed date or when the named capacity is delivered.
What does a cluster acceptance test check?
The operator tests first and sends the results. IREN's contract names hardware health, performance tests such as HPL-MxP and HPCG, and network tests including NCCL. Boost Run's contract names an Nvidia reference-architecture review, NCCL results and a reference model benchmark. The pass marks are redacted.
What happens if the customer says nothing?
On both filed contracts, silence during the test window counts as acceptance. Microsoft's window is five days, and silence does not count until a minimum GPU quantity is available to test. Cohere's window is seven business days. A production workload on a Boost Run rack also counts as acceptance.
What happens if a rack fails the test?
The customer has to name the failure. IREN then has fifteen business days to fix it, and the loop repeats until Microsoft accepts. Boost Run has twenty business days, then a new seven-day window, then one further fix of twenty business days. Missing the 15 July 2027 outside date can let Cohere drop unaccepted racks and reclaim the related prepayment.
Is contracted capacity the same as accepted capacity?
No. IREN reported $4 billion of contracted annualised run-rate revenue for 2026 capacity and $1 billion operating, as of 26 August 2026. The company said the larger figure still depends on commissioning, testing and customer acceptance. Contracted is signed. Accepted is the test, passed.
Is this a list of stocks to buy or sell?
No. This page explains GPU cluster acceptance and where the monthly fee starts. It does not rank companies or give buy or sell calls. Not investment advice. Do your own research.
Related terms
Related: GPU cluster; take-or-pay; contracted power; remaining performance obligation; cluster networking.
Markets and stack doors
Layer: Neoclouds. Markets: US. The Microsoft tranches are at Childress, Texas.
Get the Wire — short daily notes when contracted GPU capacity is delivered, accepted or delayed.
Not investment advice. Do your own research.
How we check this
Windows, cures, the 20% upfront and the invoice rule are from IREN Exhibit 10.3, filed 5 February 2026, and Boost Run's agreement filed 30 September 2026. The Microsoft statement of work was signed 31 October and 2 November 2025. Horizon 1 and the $9.7 billion description are from IREN's 13 August 2026 release. The $4 billion and $1 billion figures are from the 27 August 2026 results. CoreWeave's figures are from its quarterly report for the quarter ended 30 June 2026. Ratios and the 254 days are our arithmetic. Who gets paid, and the stuck step, are our read. Not investment advice.
Last reviewed: 3 Nov 2026 · Next review: when IREN reports whether Horizon 2 was accepted
Spot an error? Tell us and we will correct it and note the change here.
Sources
- IREN — Exhibit 10.3, Microsoft GPU statement of work, filed 5 Feb 2026 — five-day window, fifteen-business-day cure, invoices from acceptance of the minimum quantity, 20% upfront credited after month 24
- IREN — Horizon 1 accepted, 13 Aug 2026 — first of four 50 MW deployments at Childress; contract described as five years and $9.7 billion
- IREN — fiscal 2026 results, 27 Aug 2026 — $4 billion contracted annualised run-rate for 2026 capacity, $1 billion operating as of 26 Aug 2026, still subject to acceptance
- IREN — annual report for the year ended 30 June 2026 — revenue generally begins after delivery, commissioning, placing in service and acceptance
- Boost Run — current report and Cohere agreement, 30 Sep 2026 — about $525.6 million and about five years from acceptance of each rack; seven business days; outside date 15 July 2027
- CoreWeave — quarterly report for the quarter ended 30 June 2026 — term starts on a fixed date or at delivery; $2,575 million revenue, 98% from commitments; $103.7 billion remaining performance obligations; deferred revenue, lease prepayments and capitalized interest
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Writes Second Order by TKN. Focus: who gets paid, where money sticks, and which step is stuck.
