{"version":"2.1.321","anchor":"fast-mode-prompt-text-changed-no-longer-says-it-never-downg","canonical_anchor":"fast-mode-prompt-text-changed-no-longer-says-it-never-downg","heading":"Fast mode now described as running on the session's model, with a \/fast hint when off","tier":"notice","area":"Models","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.321\/e\/fast-mode-prompt-text-changed-no-longer-says-it-never-downg","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.321","markdown":"### Fast mode now described as running on the session's model, with a \/fast hint when off\n\nClaude is told fast mode may run on your current model or switch to Claude Opus, and the 'Fast mode OFF' status now points to `\/fast`\n\n**What**\n\nFast mode makes Claude's replies come out faster, and you toggle it with the `\/fast` command. Two pieces of its wording changed:\n\n- System prompt: the line Claude reads about fast mode now says it \"gives faster output on this session's model if it supports fast mode, and otherwise switches the session to Claude Opus\". Before, it said fast mode \"uses Claude Opus with faster output (it does not downgrade to a smaller model)\". The model ID listed in the same prompt is now Fable 5.2.\n\n- Status line: the status text can now read \"Fast mode OFF (\/fast turns it on)\" when a certain check passes. Before, it only said \"Fast mode OFF\".\n\n**Why**\n\nWhat Claude says about fast mode no longer promises it always uses Claude Opus; it may stay on the model you are using, or switch your session to Claude Opus. When fast mode is off, the status line shows how to turn it on.\n\n- Flag `tengu_proud_clover`: Not enough to say (read for one account on one subscription tier against v2.1.321; this account: no value returned, anonymous baseline: no value returned, compiled default: off) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Flag `tengu_harbor_willow`: On for this account, and not off by default (read for one account on one subscription tier against v2.1.321; this account: on, anonymous baseline: on, compiled default: on) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Flag `tengu_ccr_v2_session_crud_cli`: Off by default, switched on for this account (read for one account on one subscription tier against v2.1.321; this account: on, anonymous baseline: on, compiled default: off) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Area: Models\n- Names: `\/fast`\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 2\/5\n- Scope: individual\n- Heads-up: no"}