GPT-5.6 Sol Delivers Major Performance Efficiency Gains

Thibault Sottiaux, Engineering Lead on OpenAI's Codex team, reported that GPT-5.6 Sol and related models deliver exceptional performance and efficiency improvements. The engineer observed that gains have accelerated monthly since November and advised updating to current OpenAI models. Sottiaux described the results as remarkable and indicated more details will be shared soon. Independent commentary confirmed the ongoing rapid progress in model evaluations.