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5 releases, +0.3%: open-weight coding hit a wall

pulse Man shocking a CRT monitor with defibrillator paddles in a dark room, sparks flying, illustrating stalled open-weight coding

swe-bench pro across open-weight models hasn't moved in 10 weeks

mar 27th - jun 1st. 5 major open-weight releases. net progress on swe-bench pro: +0.3%. scores swung -5% and back within that window

looks like open-weight labs are optimizing hard for agent tasks and multimodality – but not for coding anymore

Table comparing five open-weight models on SWE-bench Pro from March to June 2026, scores clustered between 55.4 and 59

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