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OpenAI Launches GPT-5.3-Codex with Major Agentic Gains and First 'High' Cybersecurity Risk Rating

OpenAI releases GPT-5.3-Codex, its fastest agentic coding model yet, but delays API access after classifying it as 'High' cybersecurity capability under its Preparedness Framework.

6 min read7 sources
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Anthropic Launches Claude Opus 4.6 with Million-Token Context, Agent Teams, and 500 Zero-Day Discoveries

Anthropic releases its most capable model yet, featuring a 1M-token context window, parallel agent coordination, and security research that uncovered over 500 previously unknown vulnerabilities in open-source software.

6 min read9 sources