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OpenAI’s GPT-5.5-Cyber updates to take on Anthropic’s Mythos
Bay Area Times
June 23, 2026
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Top stories today:
- OpenAI’s GPT-5.5-Cyber updates to take on Anthropic’s Mythos
- Fugu Ultra by Sakana AI debuts, taking on Fable 5, Mythos Preview
- SpaceX -16% as $20B bond debut funds AI ambitions
- Meta invests $900M in fintech CRED, taps founder as WhatsApp chief
- Eli Lilly builds AI-powered biotech “App Store” for scientists
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Listen to our AI-generated podcast summarizing today’s newsletter (beware of hallucinations):
1. OpenAI’s GPT-5.5-Cyber updates to take on Anthropic’s Mythos
GPT-5.5-Cyber topped the CyberGym cybersecurity benchmark in OpenAI’s early testing:
Still available through a limited release to trusted defenders.
“It is our strongest model yet for finding and helping patch software vulnerabilities,” OpenAI said.
The model retains GPT-5.5’s general-purpose intelligence.
Codex Security plugin updated with out-of-the-box defensive security workflows.
OpenAI launched the Daybreak Cyber Partner program for security software and services providers
Participants get GPT-5.5-Cyber access through Trusted Access for Cyber.
OpenAI and Trail of Bits launched Patch the Planet to fix open-source bugs and fund security researchers.
Separately, OpenAI is courting advertisers and marketers ahead of its IPO.
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3. Fugu Ultra by Japan’s Sakana AI debuts, taking on Anthropic’s Fable 5, Mythos Preview
Fugu Ultra delivered competitive results against Fable 5 and Mythos Preview on Sakana AI’s early benchmarks:
Costs $5/$30 per 1M input/output tokens, vs. Fable 5’s $10/$50, GPT-5.5’s $5/$30, and Gemini 3.1 Pro Preview’s $4/$18.
Fugu’s multi-agent orchestration system also debuted.
Available through a single-model API.
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