Codex CLI blocks Luna subagents for GPT-5.6 Sol and Terra threads
QuinnISHE · ghdev · 2026-07-20
GPT-5.6 Sol and Terra cannot spawn Luna subagents in Codex CLI
A GitHub issue against openai/codex reports that gpt-5.6-sol and gpt-5.6-terra cannot use spawnagent to create gpt-5.6-luna subagents.
- The reporter says the bug appears in Codex CLI 0.144.6 on Windows.
- The issue seems tied to a commit that restricted spawned-agent models to the active backend.
- The post cites a backend version mismatch: Luna is classified as multiagent v1, while the Sol/Terra path expects the newer setup.
- The suggested fix is either to move Luna to v2 or switch Sol/Terra back to v1, depending on intended architecture.
This is a concrete multi-agent compatibility bug rather than a general model complaint.
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