Field notes on AI-era growth, deliverability, voice, and messaging for developers and teams building on Orbit by Devotel.
What the 2026 OpenAI API changes actually shut down for buyers whose agent talks on the phone — what voice-as-product from a model vendor enabled and disabled, the honest case where a direct OpenAI realtime pipeline still fits, and where a production telephony layer (SIP termination, STIR/SHAKEN attestation, A2P routing, E911, published per-minute pricing) picks the work up.
Every LLM release window now creates two standing work items for an AI-voice tenant — a migration re-pin and a cost-smoothing pass. This playbook sorts the 2026 OpenAI deprecation cycle into those two moves, names the surfaces on Devotel Orbit that absorb each (model presets, the LLM spend governor, tenant-owned audit posture), and answers the three questions every release window raises.
OpenAI's public deprecation schedule is retiring whole API surfaces in 2026 — the Assistants API, the Evals platform, and Agent Builder — plus entire legacy model families — while Chat Completions itself is explicitly not deprecated. What actually shuts down, which integrations are hit, and how an AI-first agent platform reads the timeline.
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