Fast mode disappeared from settings and chat

What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.417.41555 (1858)

What subscription do you have?

Business

What platform is your computer?

Darwin 25.3.0 arm64 arm

What issue are you seeing?

<img width="796" height="856" alt="Image" src="https://github.com/user-attachments/assets/fc380839-ea92-43cc-b6ba-2f2786bb8463" />

<img width="854" height="151" alt="Image" src="https://github.com/user-attachments/assets/cfa37132-07b0-4661-8a9c-d849b515b72c" />

Fast mode disappeared from settings and chat

What steps can reproduce the bug?

relevant config

model = "gpt-5.4"
model_reasoning_effort = "xhigh"
plan_mode_reasoning_effort = "xhigh"
network_access = true
personality = "pragmatic"
sandbox_mode = "danger-full-access"
web_search = "live"
service_tier = "fast"

[features]
network_access = true
fast_mode = true
default_mode_request_user_input = true
multi_agent = true
skills = true
unified_exec = true
shell_snapshot = true
steer = true
responses_websockets_v2 = true
responses_websockets = true
collaboration_modes = true
apps = true
image_detail_original = true
memories = true
workspace_dependencies = true
js_repl = true
prevent_idle_sleep = true

What is the expected behavior?

_No response_

Additional information

_No response_