OpenAI Retires GPT-5.2 Line From ChatGPT — Instant, Thinking, and Pro Variants All Migrate to GPT-5.5

OpenAI retired all GPT-5.2 variants from ChatGPT on June 12, including GPT-5.2 Instant, GPT-5.2 Thinking, and GPT-5.2 Pro — the generation that previously held the platform's default slot. Existing conversations that ran on GPT-5.2 automatically continue on their corresponding GPT-5.5 successor, which launched in April 2026 with stronger reasoning and coding performance. The retirement completes OpenAI's consumer-facing transition to the 5.5 generation and clears the model picker ahead of a rumored GPT-5.6 release later in June.