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## Why Enterprise and business-like ChatGPT plans should get Codex's Fast service tier by default when the user or caller has not made an explicit service-tier choice. At the same time, callers need a durable way to choose standard routing without adding a new persisted `standard` service tier value. This keeps existing config compatibility while letting core own the managed default policy. ## What changed - Resolve the effective service tier in core at session creation: explicit `fast` or `flex` wins, explicit null/clear or `[notice].fast_default_opt_out = true` resolves to standard routing, and otherwise eligible ChatGPT plans resolve to Fast when FastMode is enabled. - Add `[notice].fast_default_opt_out` as the persisted opt-out marker for managed Fast defaults. - Treat app-server/TUI `service_tier: null` as an explicit standard/clear choice by preserving that intent through config loading. - Update TUI rendering to use core's effective service tier for startup and status surfaces while still keeping `config.service_tier` as the explicit configured choice. - Update `/fast off` to clear `service_tier`, persist the opt-out marker, and send explicit standard for subsequent turns. ## Verification - Added unit coverage for config override/notice handling, service-tier resolution, runtime null clearing, and `/fast off` turn propagation. - `cargo build -p codex-cli` Full test suite was not run locally per author request.