OpenAI improved GPT-5.6 Sol in ChatGPT and expanded free user access. Here's what changed, what it means for developers, and how it compares to the competition.
OpenAI quietly rolled out improvements to GPT-5.6 Sol in ChatGPT this week, and the AI community took notice. The update, which hit the front page of Hacker News with over 70 points, brings measurable quality improvements and — crucially — expands access to free users.
What Changed in GPT-5.6 Sol?
The update focuses on three areas:
1. Improved Reasoning on Complex Tasks
GPT-5.6 Sol shows improved performance on multi-step reasoning tasks. This includes better handling of:
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