- Remove model aliases (gpt-5, gpt-5-mini, gpt-5-nano, codex-mini-latest, gpt-5-codex, gpt-5.1-codex, gpt-5.1-chat-latest) - Fix context window from 400k to 272k tokens to match Codex CLI defaults - Keep maxTokens at 128k (original value) - Simplify reasoning effort clamping closes #536