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We’re introducing Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.

Over the past three years, the cost of a given level of AI performance has fallen about 47% per quarter, faster than for any other transformative technology in history.

OpenAI extends cyber access to Ukraine for civilian defense

OpenAI today announced it will offer the Government of Ukraine access to its Daybreak program to support the cyber defense of civilian infrastructure. Working with the Ministry of Digital Transformation, OpenAI will provide Ukrainian teams with access to tools to identify software vulnerabilities and develop and test fixes more quickly.
The announcement was made on the sidelines of the UN General Assembly by Dmytro Kushneruk, the Consul General of Ukraine in San Francisco, and Sasha Baker, Head of National Security Policy at OpenAI.
Ukrainian defenders face persistent cyber attacks from Russia, alongside physical attacks on the country’s infrastructure. Ukraine’s national cyber incident response team, CERT-UA, handled⁠(opens in a new window) nearly 6,000 cyber incidents in 2025. These include attacks on hospital systems, the energy sector and telecommunications, underscoring the pressure on the organizations providing essential services to Ukrainians.

Can frontier models drive a real car? We give them control of a Toyota Corolla’s steering, accelerator, and brakes, then evaluate them on a fixed cone course.

A U.S. Strategy to Secure Geopolitical Advantage on an Uncertain Path to Superintelligence

Conclusion The possible emergence of superintelligence is a strategic challenge without precedent, and thetemptation is to resolve its uncertainty by force of will, to pick the strategy that present instinct favors
and commit to it. That is a risky choice that misunderstands the structure of the problem and the extensive uncertainty we face. The opposite temptation to be sclerotic or paralyzed under uncertainty
is not better.
The seven strategies cannot be conclusively ranked on the evidence available; commitment in
either direction, acting now or waiting, forecloses options the United States will need; and a
premature commitment also might signal to a watching rival how to beat it. The disciplined response
is to manage the dilemma by building and preserving freedom of action, hold both deterrence and
cooperation credibly open, seize advantage when windows of opportunity open, and commit when the
case is compelling. Capabilities whose absence would foreclose options should be preserved or
abandoned with intention. The capacity to choose, and the readiness to choose well when the moment
comes, is how the United States secures both geopolitical advantage and humanity’s survival with
agency.
This is a demand for work that begins now, before any crisis arrives. It means building and
deploying the capabilities that serve every strategy and beginning now to build those with lead times
that exceed the warning the United States is likely to get. It means standing up the monitoring to read
the five uncertainties and the decision machinery to act on them, demonstrating enough capability to
shape rivals’ choices without disclosing intent, and rehearsing the response. None of this can be
improvised mid-crisis, and each capability left unbuilt already forecloses options. The burden falls on
the U.S. government, the frontier companies, businesses, and civil society together, in service of the
people whose agency the strategy ultimately exists to protect

Claude discovers a novel enzyme system with CRISPR-like repeats

Today, we’re sharing early results from one of our first research programs, in which Claude autonomously discovered a novel enzyme system that is associated with an array of DNA repeats, a pattern reminiscent of CRISPR. Although we don’t yet know its function, the system that Claude discovered has a set of characteristics that have only ever been found together in a handful of other systems, all of which are programmable and perform operations like cutting, copying, and pasting DNA. Beyond CRISPR, which has already transformed science and medicine, several other such systems are now in development as promising tools.
The system that Claude found is based on a reverse transcriptase (RT), enzymes that copy RNA into DNA. While this underlying RT, found in a jumbo phage, had been identified in previous studies, Claude appears to be the first to notice the system’s defining features—an associated array of non-coding DNA sequences and an additional accessory protein of unknown function.