diff --git a/.changeset/heavy-cases-sing.md b/.changeset/heavy-cases-sing.md
new file mode 100644
index 0000000000..3e61762dba
--- /dev/null
+++ b/.changeset/heavy-cases-sing.md
@@ -0,0 +1,5 @@
+---
+"kilo-code": patch
+---
+
+Fix: Honor explicit 'disable' for reasoning effort
diff --git a/src/api/providers/base-openai-compatible-provider.ts b/src/api/providers/base-openai-compatible-provider.ts
index b8923210c2..6cce568740 100644
--- a/src/api/providers/base-openai-compatible-provider.ts
+++ b/src/api/providers/base-openai-compatible-provider.ts
@@ -101,10 +101,22 @@ export abstract class BaseOpenAiCompatibleProvider<ModelName extends string>
 			}),
 		}
 
-		// Add thinking parameter if reasoning is enabled and model supports it
-		if (this.options.enableReasoningEffort && info.supportsReasoningBinary) {
-			;(params as any).thinking = { type: "enabled" }
+		// kilocode_change start - Add reasoning effort and thinking parameters
+		if (this.options.enableReasoningEffort) {
+			const effort = this.options.reasoningEffort || info.reasoningEffort
+			const isExplicitlyDisabled = effort === "disable"
+
+			if (info.supportsReasoningBinary && !isExplicitlyDisabled) {
+				;(params as any).thinking = { type: "enabled" }
+			}
+
+			if (info.supportsReasoningEffort && !isExplicitlyDisabled) {
+				if (effort) {
+					;(params as any).reasoning_effort = effort
+				}
+			}
 		}
+		// kilocode_change end
 
 		try {
 			return this.client.chat.completions.create(params, requestOptions)
@@ -232,10 +244,22 @@ export abstract class BaseOpenAiCompatibleProvider<ModelName extends string>
 			messages: [{ role: "user", content: prompt }],
 		}
 
-		// Add thinking parameter if reasoning is enabled and model supports it
-		if (this.options.enableReasoningEffort && modelInfo.supportsReasoningBinary) {
-			;(params as any).thinking = { type: "enabled" }
+		// kilocode_change start - Add reasoning effort and thinking parameters
+		if (this.options.enableReasoningEffort) {
+			const effort = this.options.reasoningEffort || modelInfo.reasoningEffort
+			const isExplicitlyDisabled = effort === "disable"
+
+			if (modelInfo.supportsReasoningBinary && !isExplicitlyDisabled) {
+				;(params as any).thinking = { type: "enabled" }
+			}
+
+			if (modelInfo.supportsReasoningEffort && !isExplicitlyDisabled) {
+				if (effort) {
+					;(params as any).reasoning_effort = effort
+				}
+			}
 		}
+		// kilocode_change end
 
 		try {
 			const response = await this.client.chat.completions.create(params)
diff --git a/webview-ui/src/components/settings/providers/OpenAICompatible.tsx b/webview-ui/src/components/settings/providers/OpenAICompatible.tsx
index 4eea6f09f1..bd9853e23f 100644
--- a/webview-ui/src/components/settings/providers/OpenAICompatible.tsx
+++ b/webview-ui/src/components/settings/providers/OpenAICompatible.tsx
@@ -264,6 +264,11 @@ export const OpenAICompatible = ({
 									...openAiCustomModelInfo,
 									reasoningEffort: value as ReasoningEffort,
 								})
+								// kilocode_change start - also set reasoningEffort on API config
+								setApiConfigurationField("reasoningEffort", value as ReasoningEffort)
+							} else {
+								setApiConfigurationField(field, value)
+								// kilocode_change end
 							}
 						}}
 						modelInfo={{