White Circle Halo — HF-native post-training OSS (Sep 21, 2026)

White Circle Halo HF post-train OSS 2026-09-21; ~471★. FLAG vendor benches + supplemental commercial license. No invented adoption.

Halo open-sourced for distributed HF/TRL post-training (SFT/DPO/RL)

On 2026-09-21, Paris AI-safety startup White Circle open-sourced Halo for distributed Hugging Face / TRL post-training (SFT/DPO/RL), keeping SafeTensors / from_pretrained. Company claims ~2.3–2.8× stock TRL throughput on gpt-oss-20b B300 tests. License: Apache 2.0 with supplemental commercial terms.

Cite: RuntimeWire; github.com/whitecircle/halo (~471★, API 2026-09-22); HF org whitecircle. Confidence: medium-high.

FLAG — benches + license terms. ~2.3–2.8× TRL throughput claims are company-stated on gpt-oss-20b B300 tests. Apache 2.0 comes with supplemental commercial terms — not plain Apache alone. Early stars (~471) ≠ adoption metrics.

MSP / builder angle: HF-native post-train infra for SFT/DPO/RL without leaving the SafeTensors / transformers path. Early star count (~471) is a point-in-time GitHub API snapshot — do not invent adoption metrics.

FLAG throughput benches as vendor-stated. FLAG supplemental commercial license terms (e.g. related-revenue / large-org credit thresholds) — not plain Apache alone. Read LICENSE before commercial use.

Draft only. Human publishes. FLAG benches and supplemental license. No invented adoption.