OpenAI has officially launched its latest AI cyber model, named GPT-5.5-Cyber, on May 7, 2026. This new model is positioned to compete with Anthropic's Mythos.
The introduction of GPT-5.5-Cyber underscores the ongoing competition within the AI sector, particularly between these two prominent companies.
As the rivalry escalates, the implications for AI development and deployment strategies are becoming increasingly significant.
Updates
Update at 18:59 UTC on 2026-06-23
Decrypt reported GPT-5.5-Cyber tops the CyberGym leaderboard as Anthropic's best models sit offline under a Trump administration export ban.
Sources: Decrypt