OpenAI Adds Unlimited ChatGPT Text Chats and Updates GPT-5.6 Sol
OpenAI said on August 6 that ChatGPT Free and Go users will receive unlimited text chats powered by GPT-5.6 Luna starting next week, while uploads and image messages keep separate limits. Plus and Pro users are receiving an updated GPT-5.6 Sol with a reasoning slider; OpenAI says an internal three-domain evaluation found factual-error-bearing answers were 68% less common than with GPT-5.5 Instant.
OpenAI said on August 6 that ChatGPT Free and Go users will receive unlimited text conversations powered by GPT-5.6 Luna starting next week. The Verge reports that the change removes rate limits for text-only chats, while messages containing uploads or images will continue to have separate limits.
Free and Go users will also receive a Think button that gives GPT-5.6 Luna more time for harder questions, according to 9to5Mac. This is not full access to GPT-5.6 Sol: OpenAI's current help documentation lists Sol's standard ChatGPT reasoning options only for Plus, Pro, Business, and Enterprise plans. At the time of this audit, that help page still showed the existing Free and Go message limits, so the August 6 announcement describes a rollout scheduled for the following week.
GPT-5.6 Sol changes for paid plans
For Plus and Pro subscribers, OpenAI is updating GPT-5.6 Sol in regular ChatGPT conversations. The Verge and 9to5Mac report that the revised model is intended to produce more direct answers, use tighter formatting, and avoid detail that does not help. OpenAI also says it should make fewer mistakes when answers depend on dates, numbers, sources, rules, or assumptions.
9to5Mac reports that an OpenAI internal evaluation spanning financial, medical, and legal prompts found answers containing at least one factual error were 68% less common with the revised GPT-5.6 Sol than with GPT-5.5 Instant. This is a vendor-reported aggregate result, not an independently published benchmark, and it does not establish performance on a team's proprietary data or task distribution.
Plus and Pro users can also use a slider on ChatGPT web, mobile, and desktop to control how much reasoning an answer receives. OpenAI's help documentation separately describes Medium and High Sol reasoning for Plus, with Extra High and Pro options available on higher tiers. The August 6 update applies to standard ChatGPT conversations; 9to5Mac reports that the Sol versions used in ChatGPT Work and Codex are not changing as part of this release.
What teams should validate
Unlimited text access lowers the friction of testing prompt flows and longer conversations on consumer accounts, but upload and image limits remain a separate constraint for multimodal work. The split also matters when reproducing behavior: Free and Go text chats use Luna, while the paid-plan reliability claim concerns the updated Sol model.
For research, policy, and code-adjacent workflows, teams should test date-sensitive retrieval, numerical reasoning, source attribution, and failure handling against representative internal examples. The 68% figure is useful evidence about OpenAI's test set, but it should be treated as a starting hypothesis for evaluation rather than a deployment guarantee.
Key Points
- 1Free and Go users are scheduled to receive unlimited GPT-5.6 Luna text chats next week, while uploads and image messages retain separate limits.
- 2Plus and Pro users receive an updated GPT-5.6 Sol and reasoning slider; OpenAI reports 68% fewer error-bearing answers in an internal three-domain evaluation.
- 3Teams should evaluate the updated model on representative tasks because a vendor aggregate does not establish reliability on proprietary data or workflows.
Scoring Rationale
The update changes text-chat access for ChatGPT's large Free and Go user base and changes reasoning controls for paid users. The reported GPT-5.6 Sol reliability improvement matters to factual and research workflows, but it remains a vendor internal evaluation.
Sources
Public references used for this report.
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