The Month I Swapped Claude for DeepSeek

For the last month or so, I've been running a small experiment. I moved my main coding workflow off Claude Opus and onto DeepSeek's v4 Pro, the latest release while it was discounted, and I used it for real work.

The test was simple: build an MVP, index a marketplace, run long agentic sessions, and see what breaks first, the model, my patience, or my wallet.

Spoiler: none of them broke. And the bill came in under $50.

Why I Tried DeepSeek in the First Place