diff --git a/packages/types/src/providers/zai.ts b/packages/types/src/providers/zai.ts
index 69f90f232a5..d054903e34f 100644
--- a/packages/types/src/providers/zai.ts
+++ b/packages/types/src/providers/zai.ts
@@ -5,6 +5,7 @@ import { ZaiApiLine } from "../provider-settings.js"
 // https://docs.z.ai/guides/llm/glm-4-32b-0414-128k
 // https://docs.z.ai/guides/llm/glm-4.5
 // https://docs.z.ai/guides/llm/glm-4.6
+// https://docs.z.ai/guides/llm/glm-5.1
 // https://docs.z.ai/guides/overview/pricing
 // https://bigmodel.cn/pricing
 
@@ -135,6 +136,21 @@ export const internationalZAiModels = {
 		description:
 			"GLM-5 is Zhipu's next-generation model with a 202k context window and built-in thinking capabilities. It delivers state-of-the-art reasoning, coding, and agentic performance.",
 	},
+	"glm-5.1": {
+		maxTokens: 131_072,
+		contextWindow: 200_000,
+		supportsImages: false,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["disable", "medium"],
+		reasoningEffort: "medium",
+		preserveReasoning: true,
+		inputPrice: 1.4,
+		outputPrice: 4.4,
+		cacheWritesPrice: 0,
+		cacheReadsPrice: 0.26,
+		description:
+			"GLM-5.1 is Zhipu's most capable model with a 200k context window, 128k max output, and built-in thinking capabilities. It delivers top-tier reasoning, coding, and agentic performance.",
+	},
 	"glm-4.7-flash": {
 		maxTokens: 16_384,
 		contextWindow: 200_000,
@@ -311,6 +327,21 @@ export const mainlandZAiModels = {
 		description:
 			"GLM-5 is Zhipu's next-generation model with a 202k context window and built-in thinking capabilities. It delivers state-of-the-art reasoning, coding, and agentic performance.",
 	},
+	"glm-5.1": {
+		maxTokens: 131_072,
+		contextWindow: 204_800,
+		supportsImages: false,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["disable", "medium"],
+		reasoningEffort: "medium",
+		preserveReasoning: true,
+		inputPrice: 0.68,
+		outputPrice: 2.28,
+		cacheWritesPrice: 0,
+		cacheReadsPrice: 0.13,
+		description:
+			"GLM-5.1 is Zhipu's most capable model with a 200k context window, 128k max output, and built-in thinking capabilities. It delivers top-tier reasoning, coding, and agentic performance.",
+	},
 	"glm-4.7-flash": {
 		maxTokens: 16_384,
 		contextWindow: 204_800,
diff --git a/src/api/providers/__tests__/zai.spec.ts b/src/api/providers/__tests__/zai.spec.ts
index 34323b108d3..b748be20701 100644
--- a/src/api/providers/__tests__/zai.spec.ts
+++ b/src/api/providers/__tests__/zai.spec.ts
@@ -98,6 +98,24 @@ describe("ZAiHandler", () => {
 			expect(model.info.preserveReasoning).toBe(true)
 		})
 
+		it("should return GLM-5.1 international model with thinking support and 128k max output", () => {
+			const testModelId: InternationalZAiModelId = "glm-5.1"
+			const handlerWithModel = new ZAiHandler({
+				apiModelId: testModelId,
+				zaiApiKey: "test-zai-api-key",
+				zaiApiLine: "international_coding",
+			})
+			const model = handlerWithModel.getModel()
+			expect(model.id).toBe(testModelId)
+			expect(model.info).toEqual(internationalZAiModels[testModelId])
+			expect(model.info.contextWindow).toBe(200_000)
+			expect(model.info.maxTokens).toBe(131_072)
+			expect(model.info.supportsReasoningEffort).toEqual(["disable", "medium"])
+			expect(model.info.reasoningEffort).toBe("medium")
+			expect(model.info.preserveReasoning).toBe(true)
+			expect(model.info.supportsImages).toBe(false)
+		})
+
 		it("should return GLM-4.5v international model with vision support", () => {
 			const testModelId: InternationalZAiModelId = "glm-4.5v"
 			const handlerWithModel = new ZAiHandler({
@@ -178,6 +196,24 @@ describe("ZAiHandler", () => {
 			expect(model.info.contextWindow).toBe(131_072)
 		})
 
+		it("should return GLM-5.1 China model with thinking support and 128k max output", () => {
+			const testModelId: MainlandZAiModelId = "glm-5.1"
+			const handlerWithModel = new ZAiHandler({
+				apiModelId: testModelId,
+				zaiApiKey: "test-zai-api-key",
+				zaiApiLine: "china_coding",
+			})
+			const model = handlerWithModel.getModel()
+			expect(model.id).toBe(testModelId)
+			expect(model.info).toEqual(mainlandZAiModels[testModelId])
+			expect(model.info.contextWindow).toBe(204_800)
+			expect(model.info.maxTokens).toBe(131_072)
+			expect(model.info.supportsReasoningEffort).toEqual(["disable", "medium"])
+			expect(model.info.reasoningEffort).toBe("medium")
+			expect(model.info.preserveReasoning).toBe(true)
+			expect(model.info.supportsImages).toBe(false)
+		})
+
 		it("should return GLM-4.7 China model with thinking support", () => {
 			const testModelId: MainlandZAiModelId = "glm-4.7"
 			const handlerWithModel = new ZAiHandler({