Unknown model `gpt-5.6-luna` for spawn_agent, causing failures in model spawning.
Unknown model `gpt-5.6-luna` for spawn_agent, causing failures in model spawning.
Problem statement normalized from the linked evidence
CANDIDATE VIEW · NOT A PUBLISHED OPPORTUNITY
01
Qualification checklist
Gate decision: Aug 15, 2026
×
At least 3 independent users2 / 3
NOT MET
×
At least 2 independent discussions1 / 2
NOT MET
×
At least 1 supporting signal1 Workarounds
NOT MET
02
Observed signals
Users2
Discussions1
Mentions2
Active days2
Source coverageGitHub
TrendUNKNOWN
First seenJul 27, 2026
Last seenJul 29, 2026
Why the gate is holding
Fewer than 3 independent users
Fewer than 2 independent discussions
No supporting growth, persistence, intent, workaround, alternative, blocked-workflow, or cross-source signal
Competition research, commercial scoring, and Build Gap analysis do not run until this gate passes.
03
Source evidence
2 evidence records
github · MEDIUM · Jul 29, 2026
openai/codex
Reproduced this on macOS with Codex app 26.721.41059 and CLI 0.146.0-alpha.3.1. Parent model: `gpt-5.6-sol` Child request: `model=gpt-5.6-luna`, `reasoning_effort=medium`, `fork_turns=none` The result is the same: ```text Unknown model `gpt-5.6-luna` for spawn_agent. Available models: gpt-5.6-sol, gpt-5.6-terra ``` As a control, an explicit Terra medium spawn from the same parent completed successfully. I also checked the current `main` catalog: Sol and Terra are marked `multi_agent_version: v2`, while Luna is stil…
Additional reproduction on Linux with the current stable release: - Codex CLI: `0.145.0` (npm `latest`) - Parent session: `gpt-5.6-terra`, medium reasoning - Multi-agent V2 active; native `spawn_agent` override controls exposed - No local subagent-model allowlist or Luna-disabling configuration Luna is rejected before a child is created in each tested shape: ```text model="gpt-5.6-luna", reasoning_effort="low", fork_turns="none" model="gpt-5.6-luna", reasoning_effort="high", fork_turns="none" model="gpt-5.6-luna",…