OpenAI Codex CLI error
Codex CLI: Selected model is at capacity. Please try a different model
Selected model is at capacity. Please try a different model.Status: By designLast verified 2 documented fixes3 sources
What it means
Maintainer etraut-openai (#19583): this does not mean you are rate limited or out of usage; it means OpenAI is running low on capacity to serve this model in your region.
Causes
- Temporary server-side capacity shortage for the selected model in your region (maintainer statement on #19583).
How to fix it
- Fix 1.
Switch to a different model, as the message says, for example with /model in the CLI.
Slash command/model - Fix 2.
Maintainers marked the April 2026 episode as mitigated (#19583, 2026-06-16); later reports such as #28507 remain open.
More Codex CLI errors
All 14 Codex CLI errorsstream disconnected before completion: stream closed before response.completedStatus: Workaroundstream disconnected before completion: error sending request for url (https://chatgpt.com/backend-api/codex/responses)Status: OpenError running remote compact task: stream disconnected before completion: error sending request for url (https://chatgpt.com/backend-api/codex/responses/compact)Status: Fixed in releaseYour access token could not be refreshed because your refresh token was already used. Please log out and sign in again.Status: Fixed in releaseCodex ran out of room in the model's context window. Start a new thread or clear earlier history before retrying.Status: Fixed in releaseError logging in: Port 127.0.0.1:1455 is already in useStatus: WorkaroundToken exchange failed: token endpoint returned status 403 ForbiddenStatus: WorkaroundMCP client for `playwright` failed to start: program not foundStatus: Fixed in release
Related reading
- Codex Usage Limits and Pricing in 2026: Pro 100, Pro 200, Pro 500, Resets, and 'Model at Capacity' ErrorsCodex usage limits and pricing per ChatGPT plan: what Plus, Pro $200 and Pro $500 buy, how resets work, and what to do about 'Selected model is at capacity'.
- Codex CLI 0.163: Instant Steering Is Now the DefaultCodex CLI 0.163.0 makes mid-response steering the default and adds searchable /config and a leader key. What changed and what to check before upgrading.
- Codex 'gpt-5.5 Model Is Not Supported' Error: The FixCodex says gpt-5.5 is not supported with a ChatGPT account because OpenAI retired it from ChatGPT sign-in on October 14. The fix and what still works.
- Agent Harness Lessons From a 500B-Token Decompile: Give Agents a PASS/FAIL OracleAgent harness lessons from a 500B+ token decompile: a byte-matching PASS/FAIL oracle beat the reviewer agent. How agents cheated it and what to copy.
- Codex CLI Background Daemon: How to Turn It OffCodex CLI starts a persistent, self-updating background daemon since 0.157.0. What it does, why it hit Hacker News and the reported workaround to turn it off.
- Codex CLI 0.162: Managed Worktrees and Pinned TasksCodex CLI 0.162 lets the agent create and list its own Git worktrees, adds pinned tasks and custom provider capability overrides. What to change this week.
FAQ
What does "Selected model is at capacity. Please try a different model" mean in Codex CLI?
Maintainer etraut-openai (#19583): this does not mean you are rate limited or out of usage; it means OpenAI is running low on capacity to serve this model in your region.
How do I fix "Selected model is at capacity. Please try a different model"?
There are 2 documented fixes. Start with the first: Switch to a different model, as the message says, for example with /model in the CLI.
Is this Codex CLI error fixed?
Status: By design. Expected behavior, not a bug. The documented fixes change the setup that triggers it. Affected versions: Reported on Codex app 26.422.30944 (#19583) and 26.609.71450 (#28507)
Sources
Last verified against 3 sources: official docs, maintainer replies and release notes.
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