{"version":"2.1.251","anchor":"fast-mode-failures-explain-why","canonical_anchor":"fast-mode-failures-explain-why","heading":"Fast mode failures explain why","tier":"notice","area":"Models","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.251\/e\/fast-mode-failures-explain-why","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.251","markdown":"### Fast mode failures explain why\n\nWhen fast mode can't toggle, the message says whether it timed out, was refused, or the model changed.\n\n**What**\n\nWhen fast mode cannot be turned on or off, the message now says which of the three causes applied: a timeout, an explicit refusal, or the model changing while hooks that run before a model switch were still executing.\n\n**Evidence**\n\n`Fast mode was not ${o}: the model changed while PreModelSwitch hooks ran; try again`\n\n- Area: Models\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 2\/5"}