Reports

Our monthly Open Source AI Report. Each issue rounds up the open-weight model releases of the past 30 days — their benchmark scores, costs, and how they stack up against Anthropic and OpenAI — with the charts and the slide-deck PDF.

13 releasesSeptember 1 – September 30, 2026October 9, 2026

Open Source AI Report: September, 2026

Nine open-weight releases in 30 days — plus the late-August tail. DeepSeek's V4.1 Flash tied the best open-weight result on Vals AI's independent index at one twenty-second of the cost per test, while three of the month's biggest vendor benchmark tables failed to reproduce on that same harness.

Open weightsBenchmarksTerminal-BenchDeepSeekXiaomi MiMoSystem One

9 releasesJuly 17 – August 17, 2026August 18, 2026

Open Source AI Report: August, 2026

Nine open-weight model releases in 31 days. DeepSeek's V4 Pro 0813 reached #2 on Vals AI's SWE-bench Verified board — 0.6 points behind Claude Opus 5, at roughly a twelfth of the price.

Open weightsBenchmarksSWE-benchDeepSeekKimi K3QwenPDF slide deck