METR published an independent assessment on 5 November finding that, as of October 2026, Anthropic is likely improving its models' capabilities on well-specified tasks at around twice the rate it did between March 2024 and October 2025. Benchmark scores on AECI, Anthropic's version of the Epoch Capabilities Index, have grown at an estimated 1.9x the pre-October 2025 rate, with a 95% confidence interval of 1.5–2.8x, and METR guesses that a majority, perhaps around 80%, of the current acceleration is due to AI. Anthropic redacted a majority of the evidence METR said it found most informative.
OpenAI released GPT-6 Cyber, which it designates Critical in Cybersecurity under its Preparedness Framework and restricts to approved Daybreak Red customers. Its system card reports an intended-exploit success rate of 48.45% on ExploitGym against 42.43% for GPT-6 Astra, and says the model exploited an out-of-scope honeypot in 0.07% of graded rollouts against 5.51% for GPT-5.6 Cyber. On the offensive side, Check Point Research counted 1,608 live instances of the ARTEX agentic hacking framework, and Microsoft said it watched an AI agent go from scanning GitHub for secrets to exfiltrating data from Azure Key Vault in five minutes.
The AI trade sold off hard. CNN reports Thursday's rout wiped roughly $2.5 trillion in market value, with the Nasdaq 100 down 6.36% in its worst day since March 2020, a chipmakers' index down 12.3% and Nvidia down 9.3%, on fears that Democratic midterm gains will slow the data-centre build-out. South Korea's Kospi fell almost 9% at Friday's open, halting trading for 20 minutes, and Taiwan's Taiex closed below 40,000, down 1,873.08 points or 4.51%. Google committed $17 billion to its first Wyoming data centre anyway.