gpt-5.5 capacity errors and recovered session returns with only ~60-70% context left

What version of Codex CLI is running?

codex-cli 0.137.0

What subscription do you have?

Not sure

Which model were you using?

gpt-5.5

What platform is your computer?

Darwin x86_64 (macOS)

What issue are you seeing?

I am repeatedly seeing:

Selected model is at capacity. Please try a different model.

After switching models to recover the session, it often comes back showing only around 60-70% context left instead of what appears to be a fresh/full context window.

What steps can reproduce the bug?

• Use Codex CLI on macOS
• Run an active coding session with tool use
• Hit the capacity error on gpt-5.5
• Switch to another model such as gpt-5.4
• Observe that the recovered session often shows only about 60-70% context left

What is the expected behavior?

• The session should continue without capacity interruptions, or
• if recovery is required, the recovered session should not come back with unexpectedly reduced available context

Additional information

• Switching to gpt-5.4 allowed the session to continue
• I also noticed another similar report shortly before posting, so this does not look isolated