Saurav Panda 5953df7d2f fix(llm): make bu-2-0 the default again, keep mini opt-in ...

0.13.8 shipped bu-2-0-mini-preview as the ChatBrowserUse default, which
means Agent(task=...) with no llm - and every bare ChatBrowserUse() -
silently moved onto a preview model on upgrade, with no code change on
the caller's side.

Two problems with that. A preview id can change behaviour or be renamed,
so it is the wrong thing to reach by omission. And per-token price is the
wrong yardstick for an agent: total cost is tokens-per-step times steps,
and steps is a function of model quality, so a cheaper-per-token model
that needs more steps to finish can cost more and take longer. We do not
yet have a per-task benchmark number for mini to say which way that goes.

bu-2-0-mini-preview stays a first-class option: still accepted, still
priced, still what the examples demonstrate. It is just opted into by
name now rather than landed on by default. Revisit once the benchmark
number exists.

2026-08-17 09:19:26 -07:00

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