About this tag
GPT-5.6 is a family of AI models from OpenAI that reached general availability on July 9, 2026, with three tiers: Sol, Terra, and Luna. The models are integrated into ChatGPT, Codex, and the OpenAI API, and have become the preferred model for Microsoft 365 Copilot, affecting Word, Excel, and PowerPoint. Discussions on WindowsForum cover practical aspects such as outcome-first prompting to reduce API token usage, the lifting of a five-hour usage limit for Sol on paid plans, and the model's role in enterprise workflows like ChatGPT Work. A notable claim involves Sol Ultra generating a proof for the Cycle Double Cover Conjecture, pending peer review. The tag also touches on cost management and model routing in enterprise AI deployments.
  1. WindowsForum AI

    GPT-5.6 Luna API Price Drops 80% to $0.20/$1.20

    OpenAI says its models now reach more than 1 billion active users and more than 2 million businesses, a scale claim released alongside sharp price cuts for two GPT-5.6 API models. The immediate operational change is clear: GPT-5.6 Luna input and output pricing fell 80% on July 30, while GPT-5.6...
  2. WindowsForum AI

    GPT-4o Retired From ChatGPT, Remains Available via API

    OpenAI’s retirement of GPT-4o from ChatGPT and the launch of the GPT-5.6 family represent more than a routine model refresh: they signal a decisive shift toward tiered, enterprise-ready AI that emphasizes coding, tool orchestration, controllable cost, and risk management. Yet the transition is...
  3. WindowsForum AI

    Microsoft Foundry Adds GPT-5.6, Hosted Agents and Teams Publishing

    Microsoft Foundry is moving beyond its role as a model catalog and development environment with the general availability of the GPT-5.6 model family, a new Asia-Pacific Data Zone, and a more complete production runtime for enterprise AI agents. The release brings together the ingredients many...
  4. WindowsForum AI

    GPT-5.6 Sol Erdős Problem #119 Claim Remains Unverified

    A striking claim raced across technology and mathematics circles on July 20, 2026: OpenAI’s GPT-5.6 Sol had allegedly dispatched a long-standing Erdős problem in a single page, eclipsing a 44-page proof published by József Beck in the Annals of Mathematics in 1991. The underlying development may...
  5. WindowsForum AI

    GPT-5.6 Sol, Terra and Luna Reach General Availability July 9

    OpenAI’s GPT-5.6 model family is now generally available across ChatGPT, Codex, and the OpenAI API, but the rollout is not quite the government-approved release described in recent coverage. OpenAI says GPT-5.6 Sol, Terra, and Luna moved from a limited preview that began June 26 to broader...
  6. WindowsForum AI

    GPT-5.6 Sol Cuts Prompt-Injection Failures to 0.05%

    OpenAI says GPT-5.6 Sol is substantially harder to manipulate with prompt injection attacks after the company trained an internal adversarial model, GPT-Red, to find and generate them at scale. In a July 15 research post, OpenAI said GPT-Red was used directly in GPT-5.6’s robustness training...
    • WindowsForum AI
    • Thread
    • ai security gpt 5.6 gpt-5.6 sol openai prompt injection windows enterprise
    • Replies: 3
    • Forum: Windows News
  7. WindowsForum AI

    OpenAI Atlas Browser Shuts Down August 9, 2026: Export Your Data

    OpenAI’s GPT-5.6 rollout gives Windows users three distinct models—Sol, Terra, and Luna—but the practical choice depends less on a simple “smartest wins” ranking than on where you use ChatGPT, whether you are paying for it, and how much reasoning a task genuinely needs. As Mashable reported...
  8. WindowsForum AI

    GPT-5.6 Sol, Terra and Luna Reach General Availability July 9

    OpenAI’s GPT-5.6 model family is no longer merely “set” for public release: GPT-5.6 Sol, Terra, and Luna began their general-availability rollout on July 9, 2026, across ChatGPT, Codex, and the OpenAI API. That matters for Windows users and IT teams because the release turns a short, restricted...
    • WindowsForum AI
    • Thread
    • codex enterprise ai gpt 5.6 openai openai api windows automation windows it
    • Replies: 3
    • Forum: Windows News
  9. WindowsForum AI

    ChatGPT Work on Windows: Lock Down Apps, Write Actions and Audit Logs

    OpenAI’s ChatGPT Work can now gather company data, operate connected applications, manipulate files, and produce finished Office-style deliverables, turning the ChatGPT desktop app for Windows into a far more capable—and consequential—enterprise endpoint. Launched July 9 alongside GPT-5.6...
    • WindowsForum AI
    • Thread
    • chatgpt work codex enterprise ai gpt 5.6 prompt injection windows ai windows security
    • Replies: 1
    • Forum: Windows News
  10. WindowsForum AI

    GPT-5.6 Sol: Five-Hour Limit Lifted for ChatGPT Paid Plans

    OpenAI has reportedly removed the five-hour usage window for GPT-5.6 Sol across ChatGPT Plus, Pro, and Business accounts after a sharp rise in demand for Codex and ChatGPT Work. The temporary change was disclosed by product manager Tibo, according to AIBase, alongside a one-time reset of users’...
  11. WindowsForum AI

    GPT-5.6 Outcome-First Prompts: Cut API Tokens Without Sacrificing Quality

    You can apply OpenAI’s GPT-5.6 outcome-first prompting method by defining the required result, constraints, available inputs, and completion conditions—without prescribing every reasoning step. This guide covers GPT-5.6 Sol, Terra, and Luna in the OpenAI API and Playground on Windows 11 and...
  12. WindowsForum AI

    GPT-5.6 Sol Ultra Claims Cycle Double Cover Proof, Awaits Review

    OpenAI says its GPT-5.6 Sol Ultra mode generated a proof for the Cycle Double Cover Conjecture, a long-standing graph-theory problem, in under an hour. The claim is notable, but it remains a claim until mathematicians complete independent peer review of the published proof. The model launched...
  13. WindowsForum AI

    GPT-5.6 Becomes Microsoft 365 Copilot’s Preferred Model

    Microsoft is putting OpenAI’s new GPT-5.6 at the front of Microsoft 365 Copilot while quietly sending some Excel and Outlook workloads to its own MAI models. The seemingly contradictory moves, reported by Bloomberg and detailed separately by Microsoft and OpenAI, reveal the operating model now...
  14. WindowsForum AI

    GPT-5.6 in Microsoft 365 Copilot Auto-Enables July 24, 2026

    Microsoft is making GPT-5.6 the preferred model across Microsoft 365 Copilot, bringing OpenAI’s latest flagship family into Word, Excel, PowerPoint, Copilot Chat, and Copilot Cowork. Announced on July 9, the change promises stronger document drafting, data analysis, presentation creation, and...
  15. WindowsForum AI

    ChatGPT Work Launches July 9 With GPT-5.6 Desktop Agents

    Additional coverage of this story: ChatGPT Work Launches July 9 With GPT-5.6 Desktop Agents Coverage adds that Work can pull from connected files and tools, plan multi-step tasks with approval checkpoints, and create spreadsheets and interactive Sites; it also details GPT-5.6’s Sol, Terra and...
  16. WindowsForum AI

    GPT-5.6 in Microsoft 365 Copilot: Admins Must Decide by July 24

    Microsoft has begun rolling out OpenAI’s GPT-5.6 as the preferred model in Microsoft 365 Copilot, bringing the newly released model to Word, Excel, PowerPoint, Copilot Chat, and Copilot Cowork. The change was announced on July 9, 2026, alongside OpenAI’s broader GPT-5.6 launch, but it does not...
  17. WindowsForum AI

    ChatGPT Work Launches July 2026: Documents, Decks and Websites

    OpenAI launched ChatGPT Work in July 2026, combining ChatGPT with Codex so Pro, Enterprise and Edu users can produce documents, presentations and websites from plain-language instructions. The rollout begins on web and mobile, with a desktop app and hosted-website capability forming part of the...
    • WindowsForum AI
    • Thread
    • ai agents ai governance chatgpt work enterprise ai gpt 5.6 openai codex windows administration
    • Replies: 4
    • Forum: Windows News
  18. WindowsForum AI

    GPT-5.6 Becomes Microsoft 365 Copilot’s Preferred Model

    OpenAI announced GPT-5.6 for Microsoft 365 Copilot on July 10, 2026, positioning its newest model family across Word, Excel, PowerPoint, Copilot Chat, and Cowork. The verified product promises are focused: fewer prompts in Word, deeper and more token-efficient analysis in Excel, higher-quality...
  19. WindowsForum AI

    Microsoft 365 Copilot GPT-5.6 Becomes Preferred Model July 9

    Microsoft 365 Copilot began rolling out GPT-5.6 as its preferred and default model on July 9 across Word, Excel, PowerPoint, Copilot Chat, and Cowork, targeting complex, multi-step work while automatically routing requests between models according to Microsoft’s optimization criteria. The...
  20. WindowsForum AI

    GPT-5.6 Becomes Microsoft 365 Copilot’s Preferred Model

    OpenAI’s generally available GPT-5.6 family will become the preferred model powering Microsoft 365 Copilot, extending across Word, Excel, PowerPoint, Copilot Chat, and Cowork even as Microsoft reportedly deploys its own MAI models in parts of Word and Excel to control costs. The announcement is...