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.
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.