Selected model is at capacity — GPT-5.5, GPT-5.6-Sol, and GPT-6 Astra all failing (only 5.4-mini works), Sep 7 2026

What version of Codex CLI is running?

codex-cli 0.153.4

What subscription do you have?

Pro 20x ($200)

Which model were you using?

gpt-6-astra,gpt-5.6-sol,gpt-5.6-terra,gpt-5.6-luna,gpt-5.5

What platform is your computer?

Distributor ID: Ubuntu Description: Ubuntu 22.04.5 LTS Release: 22.04 Codename: jammy

What terminal emulator and version are you using (if applicable)?

No response

Codex doctor report

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}

What issue are you seeing?

Since today (Sep 7, 2026), every model except GPT-5.4-mini fails partway through
execution with "Selected model is at capacity. Please try a different model."
This affects GPT-5.5, GPT-5.6-Sol, and GPT-6 Astra — not just the newly-launched
Astra model. Only the standard (non-high-effort) GPT-5.4-mini currently works
reliably. This started suddenly; everything was working normally last week.

What steps can reproduce the bug?

Uploaded thread: 01a0413e-57a2-77d2-b256-d60591046a46

What is the expected behavior?

Selected model should either execute normally, or the picker should not
offer a model that has insufficient serving capacity.

Additional information

Started: Sep 7, 2026
Duration: ongoing, ~24 hours as of this report
status.openai.com currently shows all systems operational — this does not
appear to be reflected as an official incident yet, despite affecting
multiple model tiers (5.5, 5.6-Sol, Astra) simultaneously, not just the
newly-launched Astra model.

The report concerns codex-cli 0.153.4 on Ubuntu 22.04.5 and lists the affected models, but names no source file or test. Start by reproducing the failures and reviewing the included Codex doctor results; completion would require a confirmed root cause and restored model availability or a documented provider-side explanation.