OpenAI Launches GPT-5.6 After US Government Greenlights Public Release

OpenAI has released its latest flagship AI model series — GPT-5.6 Sol, alongside mid-range Terra and lightweight Luna — to the public following approval from the Trump administration after months of national security review. The launch on July 9 ends a period where the models were restricted to a small group of trusted US-based partners. The GPT-5.6 series represents a significant leap in capability, but one that has drawn concern over what researchers describe as an unprecedented ability to identify weaknesses in code that hackers could exploit.

The GPT-5.6 series has three tiers: Sol as the new flagship model delivering the highest capability, Terra as a mid-range version for everyday work priced at half the cost of its predecessor GPT-5.5, and Luna as a fast, low-cost option. The tiered pricing strategy signals OpenAI's push to lock in customers amid intensifying competition from Anthropic, which recently restored access to its own top-tier models Fable 5 and Mythos 5. Both OpenAI and Anthropic have filed confidential IPO documents targeting valuations approaching US$1 trillion.

The release follows deep divisions within the White House on how to handle increasingly powerful AI models. While some officials pushed for light-touch regulation to beat China in the AI race, others raised concerns about the security implications of models that could accelerate both defensive and offensive cyber capabilities. The government is now drawing up criteria for which AI models would fall under new security restrictions, in accordance with a presidential executive order. OpenAI has said it is working with Washington to build a repeatable process for future model releases.

Why it matters for Singapore: OpenAI has a growing Singapore presence — the company has been actively hiring in the city-state, including for its Singapore office that serves the Asia-Pacific region. The commercial stakes of the GPT-5.6 launch are relevant to Singapore's AI ecosystem, where enterprises and developers increasingly rely on frontier models for their own products and services. The price cut on Terra, specifically, makes advanced AI more accessible to Singapore's startup and SME community. The Singapore office also means local developers get faster access to new capabilities as OpenAI expands its regional footprint.