OpenAI just beat Anthropic's banned cybersecurity AI. Your CISO's vendor strategy just split in two.

OpenAI shipped GPT-5.5-Cyber on June 22.

It scores 85.6% on CyberGym.

Anthropic's Mythos 5 sits at 83.8% — and is currently banned by the US government.

The gap is less than 2 points.

The context is everything.

OpenAI is distributing this model to a growing network of 25+ security partners through its Daybreak program.

CrowdStrike. Palo Alto Networks. IBM. Wiz. Zscaler.

Anthropic's best cyber model is locked to roughly 40 organizations.

This is not a benchmark story.

This is a vendor lock-in story wearing a security jacket.

Your CISO is now choosing between two fundamentally different distribution models:

OpenAI: wider access, more attack surface, faster patching ecosystem.

Anthropic: restricted access, smaller trust perimeter, slower ecosystem growth.

The enterprise security stack just got a fault line down the middle.

Audit your threat detection pipeline today.

If your SOC relies on Anthropic's Mythos for vulnerability research, you are operating on a model that may not be available next quarter.

If your vendor strategy assumes all frontier models will be equally accessible, you are wrong.

The winners in enterprise security will be the ones who build multi-model resilience now — not the ones who bet on a single model staying online.

SOURCE: https://openai.com/index/daybreak-securing-the-world/
VERIFIED: OpenAI official announcement (June 22, 2026), The Decoder, Decrypt, Developer Tech
SIGNAL: OpenAI is normalizing distributed frontier cybersecurity while Anthropic restricts access. Enterprise security teams must now plan for asymmetric model availability across their vendor stack.