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By OPENAI · ReleasedApril 2026 · LicensePROPRIETARY (OPENAI API)

GPT-5.5

OpenAI's flagship reasoning model — third on GPQA-Diamond at 93.5 — and the model behind the recent enterprise pricing reset (2× per-token vs GPT-5.4) plus the Codex CLI subscription bundle.

Architecture & specs

Why it matters

Who should care