Return REASONING_VARIANTS_LOW_MEDIUM_HIGH for step model (#3588)

* Return REASONING_VARIANTS_LOW_MEDIUM_HIGH for step model

* Add import for isStepModel in model-settings.ts

Author: chrarnoldus

apps/web/src/lib/ai-gateway/providers/model-settings.ts

@@ -11,6 +11,7 @@ import type {
   OpenCodePrompt,
   OpenCodeSettings,
 } from '@kilocode/db/schema-types';
+import { isStepModel } from '@/lib/ai-gateway/providers/stepfun';
 import { ReasoningEffortSchema } from '@kilocode/db/schema-types';
 
 export const REASONING_VARIANTS_BINARY = {
@@ -94,6 +95,9 @@ export function getModelVariants(model: string): OpenCodeSettings['variants'] {
       high: { reasoning: { enabled: true, effort: 'high' } },
     };
   }
+  if (isStepModel(model)) {
+    return REASONING_VARIANTS_LOW_MEDIUM_HIGH;
+  }
   return undefined;
 }