# OpenAI GPT-5.5

Type: Product

Source: AI Intelligence Brief — https://getaibrief.com/entity/openai-gpt-55
Canonical HTML page: https://getaibrief.com/entity/openai-gpt-55

## Timeline

- **2026-06-12T17:21:00-04:00**: Government Directive Received — Anthropic receives an export control directive from the US government at 5:21 PM ET ordering suspension of all access to Fable 5 and Mythos 5 by any foreign national, including foreign national Anthropic employees.
- **2026-06-12**: Access Disabled for All Customers — Anthropic abruptly disables Fable 5 and Mythos 5 for all customers worldwide to ensure compliance with the directive, while confirming all other Anthropic models remain unaffected.
- **2026-06-09**: Fable 5 and Mythos 5 Announced — Anthropic announces Fable 5 and Mythos 5, with Fable 5 marking the company's first release of a highly advanced model to the public, featuring new safeguards that block responses in specific high-risk areas.
- **2026-04**: Claude Mythos Preview Released — Anthropic releases Claude Mythos Preview with advanced cybersecurity capabilities, stunning Wall Street and government officials. Access limited to select companies under Project Glasswing.

## Recent coverage (1 stories)

### Export Control Directive Kills Access to Fable 5 and Mythos 5 Over a Single Jailbreak Claim
2026-06-13 04:39:43 · Sentiment: Bearish · Impact: 8/10 · Sources: 4

The US government's export control directive against Anthropic's Fable 5 and Mythos 5 hinges on a single, narrow jailbreak technique that the company says reveals only minor, previously known vulnerabilities — a capability it claims is already present in OpenAI's GPT-5.5 and other public models. The decision to classify AI model access as an export-controlled item signals a paradigm shift in AI governance that could reshape the entire frontier model landscape.
Full story: https://getaibrief.com/story/anthropic-fable-5-mythos-5-export-control-jailbreak

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