{"version":"2.1.260","anchor":"model-name-validation-now-rejects-hiddencontrol-characters","canonical_anchor":"model-name-validation-now-rejects-hiddencontrol-characters","heading":"Model-name validation now rejects hidden\/control characters","tier":"notice","area":"Models","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.260\/e\/model-name-validation-now-rejects-hiddencontrol-characters","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.260","markdown":"### Model-name validation now rejects hidden\/control characters\n\nModel names with hidden or control characters are now rejected before being probed.\n\nBefore probing a model name against the server, the client now rejects names containing whitespace or Unicode control\/format characters, guarding against spoofed or lookalike model names. This check is skipped when going through a gateway or a first-party endpoint that isn't clearly Anthropic's.\n\n- Area: Models\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 1\/5"}