Dropstone 1.5 is our monthly re-baseline release. We test the top AI coding models every month and rebuild the runtime on whichever wins. This month: DeepSeek V4 Flash, V4 Pro, and Moonshot Kimi K2.6 all hosted in the US, nothing stored on our side. $15/month gets you about 450 deep coding sessions a week. Roughly twice what Claude Code Pro delivers at $20. Full technical report with the cost math and benchmarks: blankline.org/research/dropstone-1-5