The April 2026 issue of State of AI from Air Street Press. The through-line: frontier AI moved from benchmark progress to operational capability across cyber, coding, agents, and capital formation.

Two frontier models cleared the UK AI Security Institute's 32-step end-to-end cyber-attack range in a single month, and AISI now estimates frontier cyber-offence is doubling every four months, down from seven months at the end of last year. We unpack what that means for the public cybersecurity stack.

Microsoft and OpenAI reset their 2019 deal to non-exclusive while keeping Microsoft as primary cloud partner. Anthropic stacked another $40B from Google, $5B from Amazon (with $100B of AWS spend), and chip deals with Google and Broadcom reportedly worth hundreds of billions, and is reportedly already raising again at a $900B valuation. Sam Altman's Axios essay sketched a "superintelligence New Deal" in explicit FDR terms.

Four Chinese labs (Z.ai, MiniMax, Moonshot, DeepSeek) released open-weights coding models inside a 12-day window, all landing at roughly the same capability ceiling as Claude Opus 4.6 and GPT-5.4 on agentic engineering. NIST's CAISI evaluation puts the aggregate gap closer to eight months. Both are true.

Anthropic's Project Deal ran a classified marketplace of 69 Claude agents and reported that stronger agents won, and the losers did not realise it. KellyBench (from Air Street portfolio company General Reasoning) watched every frontier model lose money on a Premier League betting season under non-stationarity. Ramp's procurement agents run 3× faster.

Plus eight research papers worth keeping (π0.7, the Ríos-García epistemology paper, ClawBench, the FAIR experience-replay paper, Agent-World, and others), April Investments (Ineffable Intelligence's $1.1B seed, Saronic, Cognition's $25B talks, Cursor's $50B+ talks), and Exits (Skild and Zebra, SpaceX and Cursor, OpenAI and Hiro, Cohere and Aleph Alpha, China blocking Meta's acquisition of Manus).