GPT-6.1 Sol builds the same 3D scene at every effort level

Coding tests of Sol released two days after Sonnet 5.5, noting the odd behaviours seen while building with it.

Official summary of the Intelligence Index result, with pricing and cache-read changes.

Follow-up head-to-head with the creator reporting a clear winner after repeated trials.

Coding experiments with Sol from a channel that benchmarks models on real projects.