Horizontal vs Vertical Agents: Who Wins? | Model Routing: Commodity or Increasing in Value?
Oct 17, 2026 · 1:03:06
Harry Stebbings hosts Harrison Chase, CEO of LangChain, who argues agents are hard to build because models are non-deterministic, and value accrues to whoever controls context, harness and evals. Chase explains why model routing belongs in the harness for vertical agents but in gateways for horizontal tasks, why agent memory is unsolved after LangChain killed its memory product, and why vertical agents should start at the harness before post-training. He says inference and coding agent demand is far bigger than expected, that LangChain spends ~30% of engineering salary on coding tools — a figure he ties to Anthropic's valuation — and that open models mostly serve simple tasks, not core loops. He closes with his bull case for a $9BN Jev round and how Benchmark and Sequoia help founders.
