A new OpenAI paper on a genomics benchmark reveals Pro models for the GPT-5.6 generation for the first time, listing "GPT-5.6 Luna Pro," "Terra Pro," and "Sol Pro" as "Pro (Extended)" runs. This would be the first major change to ChatGPT Pro's structure since the plan launched, as Pro is no longer just one top-tier model. In the benchmark, Sol Pro hits a pass rate of 31.5 percent, beating the standard Sol at 28.7 percent and the best non-GPT score, Claude Opus 4.8 at 16.0 percent. The pass rate measures how often a model completes the full multi-step analysis without errors. Comparing each standard tier at its highest reasoning setting ("max") against its Pro variant shows: GPT-5.6 Luna goes from 16.5% to 23.6% (+7.1 points), GPT-5.6 Terra from 23.3% to 28.5% (+5.2 points), and GPT-5.6 Sol from 28.7% to 31.5% (+2.8 points). For the standard GPT models, the paper reports average token usage of about 33,200 tokens for Sol at its highest setting, but that number is missing for the Pro runs.