diff --git a/packages/types/src/__tests__/opencode-go.test.ts b/packages/types/src/__tests__/opencode-go.test.ts
index 2a69eb7c00..7a253d156f 100644
--- a/packages/types/src/__tests__/opencode-go.test.ts
+++ b/packages/types/src/__tests__/opencode-go.test.ts
@@ -33,6 +33,7 @@ describe("opencode-go registry", () => {
 		"mimo-v2.5-pro",
 		"deepseek-v4-pro",
 		"deepseek-v4-flash",
+		"deepseek-v4.1-flash",
 		"omen-alpha",
 		"grok-4.5",
 	]
@@ -224,6 +225,19 @@ describe("opencode-go registry", () => {
 					cacheReadsPrice: 0.19,
 				},
 			},
+			{
+				id: "deepseek-v4.1-flash",
+				expected: {
+					maxTokens: 384_000,
+					contextWindow: 1_000_000,
+					supportsImages: true,
+					supportsPromptCache: true,
+					supportsMaxTokens: true,
+					inputPrice: 0.3,
+					outputPrice: 1.2,
+					cacheReadsPrice: 0.006,
+				},
+			},
 			{
 				id: "longcat-2.0",
 				expected: {
@@ -444,6 +458,7 @@ describe("opencode-go registry", () => {
 		it("DeepSeek entries expose supportsMaxTokens so the max-output slider is available", () => {
 			expect(getOpencodeGoModelInfo("deepseek-v4-pro")?.supportsMaxTokens).toBe(true)
 			expect(getOpencodeGoModelInfo("deepseek-v4-flash")?.supportsMaxTokens).toBe(true)
+			expect(getOpencodeGoModelInfo("deepseek-v4.1-flash")?.supportsMaxTokens).toBe(true)
 		})
 	})
 
diff --git a/packages/types/src/providers/opencode-go.ts b/packages/types/src/providers/opencode-go.ts
index b31db1bd99..17120858bc 100644
--- a/packages/types/src/providers/opencode-go.ts
+++ b/packages/types/src/providers/opencode-go.ts
@@ -465,6 +465,22 @@ export const opencodeGoModels: Record<string, ModelInfo> = {
 		description:
 			"DeepSeek-V4-Flash is DeepSeek's fast, cost-efficient V4 model supporting thinking and non-thinking modes. Available via the Opencode Go plan.",
 	},
+	"deepseek-v4.1-flash": {
+		maxTokens: 384_000,
+		contextWindow: 1_000_000,
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsMaxTokens: true,
+		supportsReasoningEffort: ["disable", "low", "medium", "high", "xhigh"],
+		preserveReasoning: true,
+		reasoningEffort: "high",
+		// Go has weekday peak/off-peak pricing; use peak rates until ModelInfo can express schedules.
+		inputPrice: 0.3,
+		outputPrice: 1.2,
+		cacheReadsPrice: 0.006,
+		description:
+			"DeepSeek V4.1 Flash is a fast, cost-efficient reasoning model with a 1M context window. Available via the Opencode Go plan.",
+	},
 	"deepseek-v4-flash-vision-exp": {
 		maxTokens: 384_000,
 		contextWindow: 1_000_000,
diff --git a/src/api/providers/fetchers/__tests__/opencode-go.spec.ts b/src/api/providers/fetchers/__tests__/opencode-go.spec.ts
index 6b5b9ba37a..07147734b0 100644
--- a/src/api/providers/fetchers/__tests__/opencode-go.spec.ts
+++ b/src/api/providers/fetchers/__tests__/opencode-go.spec.ts
@@ -170,6 +170,7 @@ describe("Opencode Go Fetchers", () => {
 				"glm-5",
 				"deepseek-v4-pro",
 				"deepseek-v4-flash",
+				"deepseek-v4.1-flash",
 				"deepseek-v4-flash-vision-exp",
 				"qwen3.7-max",
 				"qwen3.8-max",
@@ -230,6 +231,19 @@ describe("Opencode Go Fetchers", () => {
 			expect(info.supportsReasoningEffort).toEqual(["disable", "low", "medium", "high", "xhigh"])
 		})
 
+		it("resolves DeepSeek V4.1 Flash to its 1M context when live metadata is absent", () => {
+			const info = parseOpencodeGoModel({ id: "deepseek-v4.1-flash" })
+			expect(info.contextWindow).toBe(1_000_000)
+			expect(info.maxTokens).toBe(384_000)
+			expect(info.supportsPromptCache).toBe(true)
+			expect(info.supportsMaxTokens).toBe(true)
+			expect(info.supportsReasoningEffort).toEqual(["disable", "low", "medium", "high", "xhigh"])
+			expect(info.supportsImages).toBe(true)
+			expect(info.inputPrice).toBe(0.3)
+			expect(info.outputPrice).toBe(1.2)
+			expect(info.cacheReadsPrice).toBe(0.006)
+		})
+
 		it("resolves GLM-5.2 with its 1M context and High/Max reasoning effort", () => {
 			const info = parseOpencodeGoModel({ id: "glm-5.2" })
 			expect(info.contextWindow).toBe(1_000_000)