{"version":"2.1.305","anchor":"1m-context-auto-suffix-extended-to-more-model-match-cases","canonical_anchor":"1m-context-auto-suffix-extended-to-more-model-match-cases","heading":"1M-context model variant is picked in more cases","tier":"notice","area":"Models","scope":"individual","heads_up":true,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.305\/e\/1m-context-auto-suffix-extended-to-more-model-match-cases","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.305","markdown":"### 1M-context model variant is picked in more cases\n\nClaude Code now adds the [1m] long-context suffix to a model in more cases where a configured model already uses 1M context\n\n**Unclear.** Exactly which model names now get the 1M-context variant is not stated.\n\n**What**\n\nSome models have a variant with a context window of one million tokens, marked by `[1m]` after the model name. The context window is how much conversation the model can see at once. When working out which model to use, Claude Code now adds `[1m]` in one more case: when a configured model, or the model's own settings, already use 1M context and the model matches. The check for 1M support was also adjusted.\n\n**Why**\n\nIf you use 1M-context models, the `[1m]` variant may be picked in more alias and override cases than before.\n\n- Area: Models\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 2\/5\n- Scope: individual\n- Heads-up: yes"}