You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
CompactionArea: what it touches
ImprovementsKind: in v2.1.300,
ImprovementsSection of the release
What
The context window is how much of the conversation the model can hold at once, measured in tokens (small chunks of text). Auto-compact summarises older parts of the conversation to free up space. Users with a one-million-token context window can now be offered a choice of window size for auto-compact, anywhere from 300k to 900k tokens.
The offer is not made when the size is already set some other way:
by an environment variable
by an experiment or a server setting
because auto-compact is turned off
It is controlled by tengu_binary_music, a setting sent from Anthropic's servers. When the server sends nothing, the offer stays off.
Why
This is a trial of letting people pick when compaction happens in long-context sessions, rather than leaving it fixed.
