The cheapest cousin
Reconstruction⚠ This is not a live capture: it is a condensed reconstruction, edited afterwards from the real transcript of the session of September 12 to 14, 2026. The prompts are the ones from the actual session, word for word; tool output is rewritten and shortened, the timing is compressed, and private repository and file names are removed.
The night pipeline reads the site’s architecture page and the lab’s private documents back against the configuration. It ran on Opus 5, in Claude Code, on the subscription. The session opens with a plan to move it to the local model on bob, and with guard-rails: a post-build check that refuses what Opus used to respect on its own, tried on thirteen injected faults before any other model touched it.
The first try in Qwen Code reads half the data file and concludes “nothing to change”. The agent blames the tool and builds a home-made harness; it is Ludo’s question — why would a tool be unable to read a whole file — that puts the fault back where it belongs: the tool truncates and says so, the model never asked for the rest.
Then come the move to Alibaba on qwen3.8-max, the first bill, and the cousin thirteen times cheaper that posts the same bench score. The agent then keeps the two private sessions on the big model, on its own initiative; Ludo pulls it back, asks for a test, and the first all-flash night hits a fifty-turn ceiling set back in the Opus days.
Bob tells it from the chair, as the body being replaced; the bench itself is in another recording.