Codex CLI 'gpt-6-sol not supported' error fixed by updating old daemon

Developers reported that Codex CLI threw a "'gpt-6-sol' model is not supported" error with ChatGPT accounts while the desktop version worked fine. The issue was traced to an outdated app-server daemon, fixable with a single update command.

2026-09-26 ~ 2026-09-26 · 4 related posts

• Codex desktop works but CLI rejects gpt-6-sol for ChatGPT accounts — jasonkneen · 2026-09-26
• User reports gpt-6-sol blocked in Codex CLI with ChatGPT accounts — jasonkneen · 2026-09-26
• Fix for Codex 'gpt-6-sol not supported' error: update the stale app-server daemon — jasonkneen · 2026-09-26

1 near-duplicate retellings: carlosrodera_