X·Trillion

Research & Writing

Notes from the desk.

Fixed income, AI agents, and the engineering behind specialist intelligence — written plainly, by people who build the systems.

Series  ·  Cheaper agents, without dumber agents  ·  three parts  ·  ▶ Watch on YouTube

Claude Code

Claude Code already lets you pick cheaper modelsLive

A two-minute change, no glue code: keep the strong model for judgment and let the repetitive work run on a cheaper one — using controls that ship with Claude Code.

04 June 2026 · 4 min read
Principle

Why splitting the work saves moneyLive

The savings are as much about context as about price. Model price × tokens supplied × number of calls — and how to bring all three down at once.

14 June 2026 · 6 min read
Engineering

Stop paying frontier-model prices for every agent stepLive

The cross-provider version: route the repetitive loop through DeepSeek and reserve Claude for the decisions that justify its cost. A minimal router you build yourself.

15 June 2026 · 9 min read
Architecture

Any model, one interfaceLive

A standalone follow-on: the provider-agnostic routing pattern behind the series. The orchestrator keeps the wheel and calls any model — DeepSeek, GPT, Gemini, Fable — through one interface. Adding a model is a config row, not a rebuild.

20 June 2026 · 7 min read
More series soon.