codex 5.1 max migration prompt won't hide

What version of Codex is running?

codex-cli 0.60.1

What subscription do you have?

pro

Which model were you using?

gpt-5.1

What platform is your computer?

Darwin 22.6.0 arm64 arm

What issue are you seeing?

I can't get the migration prompt:

"Codex just got an upgrade. Introducing gpt-5.1-codex-max

Codex is now powered by gpt-5.1-codex-max, our latest frontier agentic coding model. It is smarter and
faster than its predecessors and capable of long-running project-scale work."

to go away. I see that

"hide_gpt-5.1-codex-max_migration_prompt" = true

has been added to my config.toml file. It doesn't seem to be having the intended effect. By contrast, I think hide_gpt5_1_migration_prompt = true was working.

What steps can reproduce the bug?

Just start up codex with e.g. the gpt-5.1 model with

"hide_gpt-5.1-codex-max_migration_prompt" = true

included in your config.toml.

What is the expected behavior?

Migration prompt should go away after the first time.

Additional information

_No response_