Synthesis history

New items this pass are largely amplifications of the Agent SDK billing halt already covered, with broader outlet confirmation (The New Stack, AI Weekly, Facebook/Techmeme) [^31432][^31428][^31433]. The substantive addi…

The main new development is Anthropic's abrupt reversal on Agent SDK billing: the company announced in May it would switch Agent SDK users to API-rate billing on June 15, then paused the change at the last moment, rever…

SemiAnalysis extended their analysis into an access-inequality argument on June 15: frontier inference is now so expensive that a single prompt from Microsoft's Fable 5 'ultracode' costs more than a World Cup match tick…

The main new developments are the IPO filings and the Series H details. Anthropic raised $65 billion in its Series H [^28908][^28914] and filed confidentially for an IPO on June 1 [^28913]; OpenAI filed at $852 billion …

SemiAnalysis ran empirical tests on top-tier Anthropic and OpenAI subscription plans — purchasing each and running long-horizon coding tasks until hitting weekly limits — and found that for heavy users, subscriptions ar…