27 days to the DeepSeek V4-Pro cliff: what a 4x price jump looks like in production

So here's the thing about the deepseek v4-pro pricing schedule that has been making the rounds on hn this week (thread 48002136, 494 pts / 198 comments) - the 75% promotional discount everyone has been routing to is calendar-deterministic. it expires 2026-05-31 at UTC. that's 27 days from today. on june 1 the same agent that costs you $87 in tokens will cost you $348. most teams i've talked to about this have a vague awareness ("yeah we've been saving with deepseek") and zero plan for the cliff.