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OpenAI API Updates April 2026: GPT-5.4 Mini/Nano, Server-Side Compaction, and Sora Batch API

ยท11 min read

Complete guide to every OpenAI API update in April 2026, including GPT-5.4 mini and nano model launches, server-side compaction in the Responses API, Sora Batch API support, Realtime API DTMF events, Codex pay-as-you-go seats, and the Assistants API sunset timeline.

openaiapiapril-2026gpt-5.4responses-apisoracodexrealtime-api

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