Tutorials, deep dives and product notes — built for developers.
GPT-6.1 Sol replaced GPT-6 Sol after seven days: +4 index points, +12 on Terminal-Bench 4.0, and a cache rate halved to $0.10. It also dropped the "none" reasoning setting, uses 10-30% more output tokens, and is measurably slower.
GPT-6.1 Sol matches Claude Opus 5.5's default index score for 46% less per task and ties it at low effort for 76% less — then stops at index 52, below every Opus effort above default.
DeepSWE v1.1: adds DeepSeek V4.1 Flash 1017 (77.0%) and Meta Muse Spark Open (60.0%) as provider-reported runs, distinct from Datacurve’s mini-SWE-agent board. Muse Wonder Full remains the highest added provider result at 79.0%. Updated Oct 23, 2026.