{"version":"2.1.280","anchor":"fast-modes-default-model-resolution-changed-in-prompt-and-c","canonical_anchor":"fast-modes-default-model-resolution-changed-in-prompt-and-c","heading":"Fast mode's default model resolution changed in prompt and code","tier":"internal","area":"Models","url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280\/e\/fast-modes-default-model-resolution-changed-in-prompt-and-c","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280","markdown":"### Fast mode's default model resolution changed in prompt and code\n\nFast mode's system-prompt wording and its default-model fallback in code both changed\n\n**What**\n\nThe system prompt's sentence about fast mode (toggled with `\/fast`) dropped the qualifier that it's \"available on Opus 5\/4.8,\" now simply saying it can be toggled with `\/fast`. Separately, the code that picks a default model for the fast-mode picker no longer hardcodes `claude-opus-5`; it now calls a function to determine the current model instead.\n\n**Why**\n\nTogether these mean fast mode's model selection is no longer pinned to a fixed model name in either the prompt text or the underlying default-model logic.\n\n- Area: Models\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5"}