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TUI runs out of context with gpt-5.5 despite auto-compact config #19183

Closed as duplicate
Closed as duplicate
TUI runs out of context with gpt-5.5 despite auto-compact config#19183
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bugSomething isn't workingcontextIssues related to context management (including compaction)

Description

@brandomagnani
brandomagnani
opened on Apr 23, 2026

What happened

In Codex CLI TUI, a long chat repeatedly failed with:

Codex ran out of room in the model's context window. Start a new thread or clear earlier history before retrying.

Config

model = "gpt-5.5"
# model_context_window = 400000
# model_auto_compact_token_limit = 300000

Expected

The TUI should auto-compact before reaching the model context limit, or explain why auto-compaction did not run or did not apply.

Notes

This happened repeatedly in the same chat.

Activity

  1. github-actions
    added
    bugSomething isn't working
    CLIIssues related to the Codex CLI
    contextIssues related to context management (including compaction)
    TUIIssues related to the terminal user interface: text input, menus and dialogs, and terminal display
    on Apr 23, 2026

  2. github-actions commented on Apr 23, 2026

    @github-actions
    github-actionsBot
    on Apr 23, 2026 – with GitHub Actions
    Contributor

    Potential duplicates detected. Please review them and close your issue if it is a duplicate.

    Powered by Codex Action

  3. etraut-openai
    removed
    TUIIssues related to the terminal user interface: text input, menus and dialogs, and terminal display
    CLIIssues related to the Codex CLI
    on Apr 23, 2026
  4. etraut-openai
    closed this as a duplicateof Codex ran out of room in the model's context window. Start a new thread or clear earlier history before retrying. #18052 on Apr 23, 2026
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