Input exceeds context window error

[guidedways]

What version of Codex is running?

0.27.0

Which model were you using?

gpt5-high

What platform is your computer?

macOS

What steps can reproduce the bug?

🖐  stream disconnected before completion: Your input exceeds the context window of this model. Please adjust your input and
try again.

 Working (18s • Esc to interrupt)

▌ Write tests for @filename
 ⏎ send   Shift+⏎ newline   Ctrl+T transcript   Ctrl+C quit   2445968 tokens used   29% context left

29% left and it was only making minor edits and suddenly stopped.

What is the expected behavior?

If it's trying to read in a randomly large file, it should either read a portion in or state what it's doing. No transparency into what it's doing and why it's failing.

What do you see instead?

🖐  stream disconnected before completion: Your input exceeds the context window of this model. Please adjust your input and try again.

No clue what I'm supposed to do - adjust which input? Codex was on its own

Additional information

Ask codex to make a minor refactor involving removal of a parameter in a function.

[guidedways]

Interestingly, a /compact only increased the context by 3%? Is this expected? I was hoping to regain at least 90% of the original context.

codex
Compact task completed

▌ Write tests for @filename
 ⏎ send   Shift+⏎ newline   Ctrl+T transcript   Ctrl+C quit   272054 tokens used   32% context left

[guidedways]

I should add - after I posted the above, my next prompt suddenly bumped it to 90%! So this looks like a glitch.

[AdsQnn]

In this topic, I probably described this problem

[oyiakoumis]

same issue: #2825

[gabrielbryk]

Same issue here, similar behavior where compact does not gain much context back and i have 30-40% left despite getting htis message

[rbergman]

This is happening to me pretty frequently now, but only on one of 3 projects.

[vixkram]

On Codex $200 plan, I get Stream disconnected before completion: input exceeds context window even with ~98% window left. Seems like it disconnects too early.

[nachoal]

Same here, 30% context left.

[s-a-n-i-n]

And same here, 30% context left...

[Vamsi-klu]

And same here 32% context left

[MilesAheadToo]

Does anyone have a workaround? How do I create a new set of prompts? As it were, how do I clear the input cache?

[rporcionato]

try to create a new session or a new chat. this is working for me. If are you using a terminal, do a logoff and logon.

[hpmartini]

90% context left!!! And that was after the FIRST prompt in that context. This was the fifth or sixth time, I tried that.Yesterday, I had that error even with 98% context left.

Codex is just useless!!! Im working for hours here, and did accomplish almost nothing.

[mateusgalasso]

same here