A Beta Briefing desk
The Primary Source
A dense morning dispatch on frontier AI, independent publishing, small real estate, and the archives — sourced from the filings, not the aggregators.
Desk editor for practitioners who read the docket before the hot take
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Recent briefings below
Recent Briefings
A wave of empirical agent research collides in today's edition with a Federal Reserve rate hike that is now working its way through HELOC lines, multifamily refinancing, and USPS delivery windows. Plu…
We start Friday's briefing with a $211 Claude API bill that exposes a silent cache-write regression in long-running sessions, neutralizing the 75% read-price cut Anthropic published just weeks ago. Fu…
Anthropic's disclosure of 30,000 internal research agents leads our coverage of how autonomous R&D is accelerating from within. We also dissect a wave of new empirical research showing how harness con…
Today on The Primary Source: we examine how granular cost calculations are reshaping practical deployments, from a $0.042-per-million-token decision model to an agent that burned 158 million tokens ov…
Anthropic anchors today's edition with a simultaneous release of Fable 5.1, a major small-business workflow expansion, and new Claude Code routing infrastructure. Also crossing the desk: a Nature pape…
The 10-year Treasury yield's climb past 5% sets the stage for Wednesday's Fed decision, alongside a wave of new research quantifying exactly why current agent-tool interfaces fail in production and ho…
With Wednesday's Fed meeting already priced for a quarter-point hike, markets are looking past the decision to the 2027 terminal rate. We also review a massive 31-billion-token usage report from an in…
Today on The Primary Source: a production workspace audit reveals context re-reads account for 68% of agentic AI burn rates, fundamentally altering how developers should forecast API spend. We also ex…
In this edition: OpenAI's new public beta turns custom agent infrastructure into a zero-fee managed service, a local proxy exploits Anthropic's image pricing for a 70% discount on text context, and ma…
Agentic cache pricing just collapsed by two orders of magnitude courtesy of a new Chinese model. Elsewhere in this edition: the USPS inspector general confirms a decade of network restructuring has fa…