OpenAI has officially unveiled its next-generation GPT-5.6 family of models — Sol, Terra, and Luna — alongside a brand new ChatGPT Work agent designed to transform workplace productivity. The announcement, made on July 9, 2026, marks one of the biggest AI releases of the year and signals OpenAI’s aggressive push to dominate both the enterprise and developer markets.
Meet GPT-5.6: Sol, Terra, and Luna
For the first time, OpenAI is moving away from simple version numbering toward a tiered naming system. GPT-5.6 comes in three distinct variants, each optimized for different use cases:
- Sol (Flagship) – OpenAI’s most powerful model ever. Built for frontier reasoning, long-horizon agentic work, and complex enterprise tasks. $5 input / $30 output per million tokens.
- Terra (Balanced) – A cost-effective everyday workhorse with GPT-5.5-competitive performance at 2x lower cost. $2.50 input / $15 output per million tokens.
- Luna (Budget) – The fastest and most affordable option, ideal for lightweight tasks and high-volume applications. $1 input / $6 output per million tokens.
According to OpenAI CEO Sam Altman, Sol is 54% more token-efficient on coding tasks compared to previous models. The company also calls GPT-5.6 its “strongest cybersecurity model yet,” capable of advanced threat modeling, code review, and defensive blue teaming.
ChatGPT Work: Your AI-Powered Office Assistant
Alongside the new models, OpenAI launched ChatGPT Work, a dedicated workplace agent designed for enterprise teams. Available on desktop, web, and mobile, ChatGPT Work handles daily clerical tasks — drafting documents, building spreadsheets, creating presentations, and managing workflows — all within a single interface.
The ChatGPT desktop app has also been significantly upgraded. Codex is now fully integrated into ChatGPT, meaning developers and power users can seamlessly switch between conversation mode and coding mode. A new “ultra” acceleration mode coordinates multiple AI agents across parallel workstreams to finish complex tasks faster.
Performance That Beats the Competition
OpenAI is making bold claims about GPT-5.6’s benchmark performance. According to the Artificial Analysis Coding Agent Index:
- Sol scores 80 — 2.8 points above Anthropic’s Claude Fable 5 — while using less than half the output tokens, taking less than half the time, and costing about one-third less.
- Terra performs just above Fable 5.
- Luna outperforms Claude Opus 4.8.
OpenAI also emphasized Sol’s improved “design judgment,” claiming it can create tasteful, ergonomic, and functional interfaces from only high-level direction, and even self-correct visual issues before delivering results.
Availability & Pricing
GPT-5.6 is rolling out across ChatGPT, Codex, and the OpenAI API over 24 hours. Here’s who gets what:
- ChatGPT Plus, Pro, Business & Enterprise – Access to Sol through medium/higher effort settings; Pro/Enterprise get Sol Pro for complex tasks.
- ChatGPT Work & Codex – Free/Go users get Terra; paid users can choose among Sol, Terra, and Luna with customizable effort levels.
- API Developers – Full access to all three models, plus multi-agent support and Programmatic Tool Calling.
The GPT-5.4 model will be retired on July 23, while GPT-5.5 models remain available.
Frequently Asked Questions
Q: What happened to GPT-5?
A: OpenAI skipped the “GPT-5” naming and jumped to GPT-5.5 and now GPT-5.6 as iterative improvements on their post-GPT-4 architecture. The Sol/Terra/Luna naming represents a new tier system.
Q: Is GPT-5.6 available for free users?
A: Free users have access to GPT-5.6 Terra through ChatGPT Work and Codex. Higher-tier models (Sol and Luna) require a Plus, Pro, Business, or Enterprise subscription.
Q: Can I still use GPT-4 and older models?
A: GPT-5.4 will be retired on July 23, 2026. GPT-5.5 and the new GPT-5.6 family remain available. OpenAI may phase out older models over time.
Stay tuned to PC Master Deals for more AI and tech news. Which GPT-5.6 model are you most excited about? Let us know in the comments!