Anthropic dropped Claude Sonnet 5 on June 30, and the positioning is deliberate: this is the most agentic Sonnet model they've shipped. Close to Opus 4.8 in performance, at 40% lower cost at standard pricing, and 60% cheaper during the introductory window that runs through August 31, 2026. For anyone running multi-step agents at scale, this changes the cost math in a concrete way. What's actually in the release Sonnet 5 ( claude-sonnet-5 ) sits between Haiku 4.5 and Opus 4.8 in the lineup, but Anthropic is pitching it as the default workhorse for most agentic work. It carries a 1M token context window, 128k max output, and adaptive thinking. Fast latency. And it defaults to effort: high on the Claude API and Claude Code, meaning the model engages its full reasoning budget by default. That's the same default as Opus 4.8. Here's the full pricing picture now: Haiku 4.5 : $1/$5 per million tokens. Fast, near-frontier for simple tasks. Sonnet 5 intro (through Aug 31)...
Three things happened this week that, together, tell you something real about where AI tooling is headed. Tesla announced a $200-per-week spending cap on employee AI tools, effective July 6. Uber's COO publicly stated the company burned through its entire 2026 AI budget in four months, then capped per-person spending at $1,500 per month. And reporting from Electrek revealed that Meta's internal AI usage hit 73.7 trillion tokens in a single month, putting the company on track for billions in annual costs. Meta tracks this on an internal leaderboard called "Claudeonomics." The bill for AI-assisted engineering is no longer theoretical. Why Token Costs Are Spiking Now If you've been wondering why this is happening all at once, the short answer is agents. Chat-based AI usage is relatively predictable: a developer opens a window, types a question, gets an answer. The cost per interaction is low enough that most companies could treat it like a SaaS subscription an...