Teknium's Tests Show Fable as Orchestrator with Astra Subagents Works Best

Teknium of Nous Research, a well-known figure in the open-source model community, shared practical conclusions on multi-agent systems on September 7: using Fable as the orchestrator with Astra as executing subagents yields significantly better collaboration, whereas earlier attempts to have Astra orchestrate its own subagents repeatedly failed.

Confirmed

Teknium said that in a session a few days ago, he ran Fable continuously for 19 hours, dispatching 1,390 subagents.
Responding to doubts that it was a harness/prompt issue, Teknium said Fable handled the system with ease — it reviewed all subagents' run trajectories and even suggested improvements to the harness itself; the agent harness held up.
Community users @pvncher and @maxdietel each tested the combo and endorsed it: code refactoring results were strong; even Astra, after its own subagent orchestration attempts failed, reviewed the user's refactoring session log and recommended switching to Fable as the orchestrator.

Why it matters

This hands-on account comes from a first-party user and developer in the Hermes ecosystem, offering a concrete, reusable recipe for the orchestrator/executor multi-agent architecture.
1,390 subagents over a 19-hour single session demonstrates Fable's stability in long-horizon, large-scale orchestration tasks — valuable reference for teams building complex agent systems.

2026-09-07 ~ 2026-09-07 · 5 related posts

Primary sources

Teknium: Use Fable to Orchestrate and Astra to Implement for Better Multi-Agent Coding — Teknium · 2026-09-07 20:00 (UTC+08:00)
Teknium: Fable orchestrated 1390 subagents over 19 hours in one session — Teknium · 2026-09-07 21:04 (UTC+08:00)
Fable as orchestrator plus Astra as subagents: a multi-agent combo that works — pvncher · 2026-09-07 20:36 (UTC+08:00)

[source] Teknium: Use Fable to Orchestrate and Astra to Implement for Better Multi-Agent Coding — Teknium · 2026-09-07
[source] Fable as orchestrator plus Astra as subagents: a multi-agent combo that works — pvncher · 2026-09-07
Fable as orchestrator + Astra as subagents: a multi-agent combo that works — max_dietel · 2026-09-07
[source] Teknium: Fable orchestrated 1390 subagents over 19 hours in one session — Teknium · 2026-09-07
Teknium's agent harness ran 1390 subagents over 19 hours in one session — Teknium · 2026-09-07