OpenAI has announced an updated version of GPT-5.6 Sol, its flagship model in ChatGPT. The company says the new iteration improves accuracy and consistency, addressing common complaints about reliability in complex tasks. The change is rolling out to ChatGPT users, though the announcement does not specify a timeline or whether the upgrade applies to all tiers.
Separately, OpenAI is widening access to GPT-5.6 Luna, a lighter model aimed at everyday conversations. Free users will now get expanded access to Luna, including unlimited chats for routine queries. This move appears designed to reduce friction for casual users while reserving the more capable Sol for heavier workloads.
Because the source is a single official announcement, there are no conflicting details to compare. The key takeaway is that OpenAI is balancing performance improvements with broader free-tier availability, likely to keep both power users and casual users engaged.