OpenAI Unifies Models: GPT-5.6 Sol Powers Plus and Pro Tiers

rohanpaul_ai · x · 2026-08-07

OpenAI announced an update to ChatGPT's model allocation. Plus and Pro users now uniformly use the GPT-5.6 Sol model for both instant responses and deep thinking, eliminating the previous disconnect in tone and behavior when switching reasoning intensity.

Meanwhile, Free and Go users will default to the GPT-5.6 Luna model, enjoying unlimited text chats and a "Think" button for complex queries. OpenAI's internal evaluations show a 68% reduction in factual errors in finance, medicine, and law compared to GPT-5.5 Instant.

Related event: OpenAI Upgrades ChatGPT: Unified Models and Free Unlimited Chat(21 posts)→

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