Baseten does not make AI models. It runs them. The company's software optimizes inference for open-source models, handling the latency, GPU scheduling, and cost-per-token arithmetic that determines whether an AI application is profitable or a money pit. On June 18, it closed a $1.5 billion funding round at a $13 billion valuation. Five months ago, Baseten was worth $5 billion. Its annualized revenue grew from $200 million to $600 million between December 2025 and March 2026, a reported 1,900% year-over-year increase. Altimeter Capital, Conviction, Spark Capital, Sands Capital, and Wellington Management co-led.
That trajectory makes a specific argument about where value is concentrating in the AI stack. The model builders are large and visible. The inference layer is quieter, apparently faster-growing, and now worth more per dollar of revenue than almost any model company not named OpenAI or Anthropic. Baseten's customers (Cursor, Mercor, OpenEvidence) report 30% cost savings versus closed-source APIs. When you cut 30% from the input that determines your unit economics, that vendor becomes load-bearing infrastructure.
Salesforce's $3.6 billion acquisition of Fin (formerly Intercom's AI customer service platform, announced June 15) lands the same message from a different angle. Salesforce did not buy Fin for its chatbot. It bought a production-grade AI orchestration layer to plug into Agentforce. Fin resolves 76% of support volume end-to-end. What Salesforce paid for was the proven runtime, not the underlying model. Two of the week's biggest deals were, at their core, bets on execution infrastructure rather than model capability.
The numbers
Total disclosed capital this week: $7.3 billion across 61 rounds. That is down sharply from $44.7 billion last week, but the comparison is almost entirely a function of three anomalous rounds from June 8 to 14: Prometheus ($12B), Helix Digital Infrastructure ($10B), and Supermicro's equity deal ($7B). Strip out every round above $1 billion from both periods and the picture stabilizes into a more moderate decline.
| Metric | Week of June 15 | Week of June 8 | Change |
|---|---|---|---|
| Total disclosed capital | $7.3B | $44.7B | -84% |
| Capital (ex-$1B+ rounds) | $3.8B | $5.75B | -34% |
| Number of rounds | 61 | 75 | -19% |
| Largest single round | $2B (Kling AI) | $12B (Prometheus) | -83% |
| AI-sector capital share | ~85% | ~78% | +7pp |
The underlying pattern at the sub-billion level shows a moderate 34% decline. The AI sector's share of disclosed capital rose 7 percentage points this week despite the overall total falling, suggesting non-AI sectors contracted more sharply than AI did.
