Codex defaults to 3 subagents — one config.toml line raises concurrency to 64
daniel_mac8 · x · 2026-09-07
Codex by default runs at most 3 subagents concurrently, but OpenAI tested its Astra with up to 64.
Add this to your config.toml:
[agents]
maxconcurrentthreadspersession = 64
The author demos Astra orchestrating 64 Luna subagents in parallel; a follow-up notes the Codex UI becomes laggy, likely from CPU overload.
Related event: Codex caps subagents at 3 by default; one config line unlocks 64(5 posts)→
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