Many AI users are convinced that OpenAI is quietly running GPT-5.6 inside ChatGPT. OpenAI isn't confirming anything.

GPT-5.5 Cyber tops the CyberGym leaderboard as Anthropic's best models sit offline under a Trump administration export ban.

Here's how Anthropic and OpenAI's most powerful AI models stack up.

OpenAI is rolling out the full, limited-release version of GPT-5.5-Cyber—a specialized AI model that outperforms its ...

The victory of GPT-5.5 aligns with recent third-party analysis suggesting that OpenAI's models are currently superior at strictly adhering to multi-part, complex prompts.

Anthropic's most powerful model ever, Fable 5, disappeared days after launch. I got to test its capabilities while it was ...

GPT-5.6 was already running in Codex for some users before OpenAI’s government-approved preview opened to partners. A ...

Anthropic's new Claude Fable 5 is the same base model as Mythos but with guardrails attached ...

The government directed Anthropic to block foreign nationals, both inside and outside the US, from using the models, forcing the company to block everyone.