GLM-5.3-Flash RL training pushed to 1M-token context in SkyRL, 2.1x faster at 256K

AndrewLBeam · x · 2026-10-23

Andrew Beam's team partnered with Anyscale to push GLM-5.3-Flash training to 1M tokens in SkyRL — 64x longer context — plus 2.1x faster training steps at 256K. The culprit: the sparse attention implementation 'wasn't so sparse.' Fixes have been contributed back to open source.

Related event: GLM-5.3-Flash RL Training Context Scaled to 1M Tokens, 2.1x Faster(3 posts)→

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