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    OpenAI News (firm-scan)Thursday, August 6, 2026 3 min read
    OpenAI

    Improving GPT-5.6 Sol in ChatGPT—and expanding access for free users

    OpenAI has updated its ChatGPT platform with GPT-5.6 Sol for paid users and GPT-5.6 Luna as the new default for free users, with unlimited text chats rolling out next week. Internal evaluations show factual error rates dropped approximat…

    OpenAI has updated its ChatGPT platform with GPT-5.6 Sol for paid users and GPT-5.6 Luna as the new default for free users, with unlimited text chats rolling out next week. Internal evaluations show factual error rates dropped approximately 62% with GPT-5.6 Luna and 68% with GPT-5.6 Sol compared to GPT-5.5 Instant, specifically across financial, medical, and legal prompts requiring factual detail. Paid (Plus and Pro) users gain a reasoning-effort slider allowing them to dial between instant and deeper thinking modes within a single consistent model. Free users receive a new Think button for on-demand deeper reasoning on harder questions, subject to abuse guardrails. The release positions OpenAI's most capable consumer models as materially more reliable for fact-dependent use cases while broadening the addressable user base.

    Key takeaways
    • 01OpenAI has updated its ChatGPT platform with GPT-5.6 Sol for paid users and GPT-5.6 Luna as the new default for free users, with unlimited text chats rolling out next week.
    • 02Internal evaluations show factual error rates dropped approximately 62% with GPT-5.6 Luna and 68% with GPT-5.6 Sol compared to GPT-5.5 Instant, specifically across financial, medical, and legal prompts requiring factual detail.
    • 03Paid (Plus and Pro) users gain a reasoning-effort slider allowing them to dial between instant and deeper thinking modes within a single consistent model.
    • 04Free users receive a new Think button for on-demand deeper reasoning on harder questions, subject to abuse guardrails.

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