{"version":"2.1.286","anchor":"fast-mode-400-does-not-support-the-speed-parameter-dete","canonical_anchor":"fast-mode-400-does-not-support-the-speed-parameter-dete","heading":"Claude Code recognizes when a model rejects the fast mode speed setting","tier":"notice","area":"Models","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.286\/e\/fast-mode-400-does-not-support-the-speed-parameter-dete","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.286","markdown":"### Claude Code recognizes when a model rejects the fast mode speed setting\n\nClaude Code can now spot an error saying the requested model does not support the `speed` setting\n\n**Unclear.** It is not clear where this check is used or what Claude Code does when it matches.\n\n**What**\n\nFast mode asks the model to answer faster using a speed setting. Claude Code can now recognize the error that comes back when a model does not support that setting. It also checks that the model named in the error is the one it asked for.\n\n**Why**\n\nThis could let fast mode handle a model that does not support it more gracefully, rather than simply failing.\n\n- Area: Models\n- Tier: You'll notice\n- Useful: 1\/5\n- Signal: 1\/5"}