You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ModelsArea: what it touches
ImprovementsKind: in v2.1.311,
ImprovementsSection of the release
Unclear Which accounts or setups met the conditions of the removed rule is not stated.
What
Some models have a version with a 1-million-token context window (how much text Claude can hold at once), marked by a [1m] suffix on the model name. When Claude Code turns a short model name into a full one, one rule used to strip the [1m] suffix under certain conditions. That rule is gone, and the suffix is now added in those cases.
Why
Some people asking for the 1M-context version may now get a different model name than before.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhich accounts or setups met the conditions of the removed rule is not stated.
Anthropic's release notes agreeChanged model names and IDs to drop the [1m] suffix and its label on models where the suffix has no effect; the suffix is still accepted
