# GPT-5.6 series

Type: Product

Source: AI Intelligence Brief — https://getaibrief.com/entity/gpt-56-series
Canonical HTML page: https://getaibrief.com/entity/gpt-56-series

## Timeline

- **2026-06-27**: OpenAI Limited Preview Begins — OpenAI announces a limited preview of GPT-5.6 (Sol, Terra, Luna) for a small group of government-vetted partners.
- **2026-06-26**: Lutnick Letter to Anthropic — Commerce Secretary Lutnick praises Anthropic’s cooperation in a letter to co-founder Tom Brown.
- **2026-06-21**: Mythos 5 Partially Restored — Axios and The Verge report that Anthropic has restored Mythos 5 on a limited basis after addressing government concerns.
- **2026-06-02**: Executive Order Signed — President Trump signs an executive order directing the Commerce Department to create a review framework for frontier AI models.
- **2026-06**: Anthropic Disables Fable 5 & Mythos 5 — Anthropic launches and then disables its Fable 5 and Mythos 5 models three days after launch, following a U.S. export control directive.

## Recent coverage (1 stories)

### GPT-5.6 Sol, Terra, Luna: First AI Models Under US Pre-Release Review
2026-07-25 07:23:57 · Sentiment: Bearish · Impact: 7/10 · Sources: 3

The US government’s intervention in the release of OpenAI’s GPT-5.6 series and Anthropic’s recent models marks a turning point for AI development, potentially reshaping norms around model access and safety evaluation.
Full story: https://getaibrief.com/story/ai-models-gpt56-government-review

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