OpenAI's GPT-5.6 Sol update adds reasoning slider to ChatGPT

New reasoning control for ChatGPT

OpenAI has begun rolling out the GPT-5.6 Sol update, which adds a reasoning slider to ChatGPT. The slider gives users direct control over how much computational effort the model applies to a response. A lower setting delivers quicker, simpler answers, while a higher setting spends more time on complex reasoning tasks.

The feature is part of a broader upgrade that the company has been testing in recent weeks. Early users have reported that the slider appears in the chat interface as a simple draggable control, allowing on-the-fly adjustments without needing to switch models manually.

Free tier gets a significant boost

Alongside the slider, OpenAI has upgraded free ChatGPT users to the GPT-5.6 Luna model. This replaces the older version that free users previously accessed, bringing improved language understanding and response quality to a wider audience.

More notably, free users now get unlimited text chats. Earlier, free accounts were subject to daily message caps, which often frustrated heavy users. With this change, OpenAI removes those limits entirely, making the service far more usable for students, writers, and professionals who rely on ChatGPT for regular work.

Paid users gain extra flexibility

Paid subscribers, including ChatGPT Plus and Pro users, receive the same reasoning slider in the Sol update. For them, the tool adds a new layer of control over the model's behaviour, letting them balance speed and depth depending on the task at hand.

The move signals a shift in OpenAI's strategy. Instead of locking advanced features behind a paywall, the company is now pushing more capabilities to the free tier. Analysts see this as a bid to widen the user base and gather more feedback, even as competition in the AI assistant space intensifies.

What the update means for daily use

For an average user, the reasoning slider is subtle but practical. A quick query like a recipe or a fact check works fine on a low setting. For coding problems, mathematical proofs, or long-form analysis, cranking the slider up yields more thorough answers.

OpenAI has not disclosed the underlying technical details of how the slider adjusts reasoning depth. The company has confirmed, however, that it does not change the model's core parameters—only the inference time and token budget allocated to a response.

Rollout and availability

The update is being deployed gradually. Some users have already seen the reasoning slider in their interface, while others are still waiting for it to appear. OpenAI has not given a specific timeline for full availability, but the rollout is expected to complete within days.

No changes have been announced for API pricing or enterprise plans as part of this update. The company says more details about GPT-5.6's capabilities will be shared in the coming weeks.

Observers are watching whether the unlimited free chats will strain OpenAI's infrastructure, especially during peak hours. The company has not commented on server capacity or potential slowdowns.

For now, ChatGPT users can experiment with the reasoning slider and enjoy the new freedom of unlimited conversations. The next few weeks will reveal how the update holds up under real-world demand.