DeepSeek Tests v4.1 flash Across 8 Harnesses, Minimal Setups Win

DeepSeek released Harness v0.1.5, deeply integrated with its new v4.1 flash model, and evaluated it across eight agent harness configurations. The model performed best in minimal harnesses such as mini-SWE, showing that training-environment alignment strongly affects coding performance.

2026-09-10 ~ 2026-09-11 · 3 related posts

• DeepSeek releases Harness v0.1.5 with Agent Teams, co-trained with V4.1 Flash — teortaxesTex · 2026-09-10
• DeepSeek evals v4.1 flash in 8 harness configs — best in minimal harnesses, worse in Claude Code and Codex — zainhas · 2026-09-10

1 near-duplicate retellings: mariofilhoml