This is a great move by OpenAI to provide GPT-5.6 Luna for free,

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This is a great move by OpenAI to provide GPT-5.6 Luna for free, with unlimited access for free users. Big AI labs eventually need to do something about their massive cost problem for end users. Otherwise, open-weight models will simply replace them.

OpenAI@OpenAIAug 6

We’re making better intelligence easier to access in ChatGPT for everyone: - GPT-5.6 Sol now powers both Instant and deep reasoning for Plus & Pro users, delivering more factual, focused responses. - Free & Go users get unlimited text chats with GPT-5.6 Luna starting tomorrow.