Two hard deadlines. Two billing changes. Most FinOps teams have modeled neither.
In this episode of CloudCostChefs, we break down the two cloud cost cliffs hitting enterprise teams this summer — and why both are more dangerous than the headlines suggest.
GitHub Copilot's Hidden September Cliff
June 1 gets all the coverage. Token-based AI Credits replace Premium Requests. Agentic sessions burn $5–20 each. On a 200-developer Business org, daily agent use generates $5,600/month in overages above seat cost.
But the real cliff is September 1 — not June 1. GitHub's promotional credit buffer (worth $30/user/month on Business, $70 on Enterprise) runs June through August, masking real consumption. Teams that build agentic workflows on promo-inflated capacity will hit a wall on September 1 when the buffer disappears and production billing starts. By then, the habits are locked in.
We debate whether token-based billing is actually a governance improvement over opaque PRU billing — and why model selection (Sonnet vs. Opus) just became a budget policy decision, not a developer preference.
Azure's Auto-Renew Silent Failure
July 1, 2026 is 47 days away. Microsoft is retiring Reserved Instances for 18 legacy VM families including Ev3, Dv3, Dv2, and Fsv2. Auto-renew does not migrate you to a new RI. It silently fails. Your VM keeps running. Your discount disappears.
A 100-VM fleet at average on-demand rates goes from $131K to $220K annually with no alert, no warning, and no grace period.
The group most at risk isn't organizations whose RIs expire before July 1 — they'll get the notification. It's teams on 3-year RIs for Dv3/Ev3 expiring 2027–2028. Everything looks fine right now. July 1 is their last action window before auto-renew silently fails.
We cover all three migration paths — new RIs on Dv5/Ev5, Azure Savings Plans, or Spot + Savings Plan hybrid — and which org profiles each one fits.
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