OpenAI Introduces Unlimited Text Chats for Free ChatGPT Users Powered by GPT-5.6 Luna

OpenAI has announced the removal of message limits on standard text-based conversations for all ChatGPT users. The expansion follows the platform surpassing one billion weekly active users and introduces new model tiers and reasoning controls across both free and paid plans.

What Happened

Under the latest update, the new GPT-5.6 Luna model will become the default engine for Free and Go tier users, taking over from GPT-5.5. Alongside standard text conversations, these tiers will receive a dedicated “Think” option to invoke higher reasoning capabilities for more challenging queries. OpenAI noted that while text chats are becoming unlimited, separate usage caps will remain in place for non-text features, including voice interactions, file uploads, image handling, and image generation.

For ChatGPT Plus and Pro subscribers, OpenAI is rolling out an upgraded GPT-5.6 Sol model tailored for rapid outputs across planning, writing, advice, web research, and decision-making tasks. This release is separate from the GPT-5.6 Sol build deployed for Codex and Work environments. Paid members also gain access to an adjustable thinking slider, allowing users to customize the depth of reasoning based on task complexity.

Key Highlights

• Unlimited Text Chats: Caps on standard text messaging are being removed for all user tiers.
• New Default Model for Free Tiers: GPT-5.6 Luna replaces GPT-5.5 as the default model for Free and Go accounts.
• Reasoning Controls: Free and Go users receive a new “Think” button for complex questions, while Plus and Pro users receive a customizable thinking slider.
• Upgraded Paid Tier Model: Plus and Pro members receive an upgraded GPT-5.6 Sol model engineered for more compact, robust responses during quick workflows.
• Reduced Error Rates: Company evaluations indicate that factual errors dropped by 62% on GPT-5.6 Luna and 68% on GPT-5.6 Sol relative to GPT-5.5-Instant.
• Retained Limits: Separate constraints continue to apply to voice mode, file processing, and image generation tools.

Why This Matters

The adjustments expand base functionality for non-paying users while enhancing accuracy across the platform. According to OpenAI’s internal benchmark figures, factual mistakes occur significantly less often in both new models when compared against GPT-5.5-Instant. Subscribers also receive greater control over response depth through interactive reasoning adjustments.

What to Watch Next

The upgraded GPT-5.6 Sol model is available immediately for Plus and Pro subscribers. Remaining rollouts for Free and Go users will begin rolling out this week, with access to unlimited text messaging and the Think button scheduled to arrive next week.

Frequently Asked Questions

Are all ChatGPT features completely unlimited now?

No. While standard text chats are becoming unlimited, OpenAI stated that separate limits remain for voice mode, file uploads, image analysis, and image generation.

What is the difference between GPT-5.6 Luna and GPT-5.6 Sol?

GPT-5.6 Luna serves as the default engine for Free and Go accounts. GPT-5.6 Sol is an upgraded model for Plus and Pro subscribers designed to deliver more compact and robust answers for quick tasks such as research, planning, and writing.

How do the new reasoning tools work?

Free and Go users can activate a “Think” button for complex queries, whereas Plus and Pro accounts can use a thinking slider to calibrate the reasoning depth based on the specific steps required for a prompt.

Source: TechCrunch via OpenAI announcement.