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codex - 💡(How to fix) Fix Fast mode disappeared from settings and chat [3 comments, 3 participants]

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openai/codex#18841•Fetched 2026-04-22 07:51:40
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thepluckthepluck
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Code Example

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
RAW_BUFFERClick to expand / collapse

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

extent analysis

TL;DR

The "Fast mode" disappearance from settings and chat may be related to the configuration settings, and verifying the fast_mode feature flag in the config file could be a starting point.

Guidance

  • Check the fast_mode feature flag in the provided config file to ensure it is set to true and has not been overridden by any other configuration settings.
  • Review the Codex App version and subscription to see if there are any known issues or limitations related to the "Fast mode" feature in Version 26.417.41555 (1858) for Business subscribers.
  • Investigate if there are any recent changes to the configuration file or the Codex App that could have caused the "Fast mode" to disappear from settings and chat.
  • Verify if the issue persists across different platforms or if it is specific to Darwin 25.3.0 arm64 arm.

Notes

The provided information does not include any error messages or specific details about the disappearance of the "Fast mode". Further investigation into the configuration settings and the Codex App's behavior is needed to determine the root cause.

Recommendation

Apply workaround: Since the issue is related to a specific feature, trying to reset the configuration settings to their default values or checking for any overrides in the config file might help resolve the issue.

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codex - 💡(How to fix) Fix Fast mode disappeared from settings and chat [3 comments, 3 participants]