diff --git a/packages/opencode/src/provider/provider.ts b/packages/opencode/src/provider/provider.ts
index 4013dcee36e7..ed47467f1628 100644
--- a/packages/opencode/src/provider/provider.ts
+++ b/packages/opencode/src/provider/provider.ts
@@ -1203,7 +1203,10 @@ const layer: Layer.Layer<
               name,
               providerID: ProviderID.make(providerID),
               capabilities: {
-                temperature: model.temperature ?? existingModel?.capabilities.temperature ?? false,
+                temperature:
+                  model.temperature ??
+                  existingModel?.capabilities.temperature ??
+                  (apiNpm === "@ai-sdk/openai-compatible" ? true : false),
                 reasoning: model.reasoning ?? existingModel?.capabilities.reasoning ?? false,
                 attachment: model.attachment ?? existingModel?.capabilities.attachment ?? false,
                 toolcall: model.tool_call ?? existingModel?.capabilities.toolcall ?? true,
diff --git a/packages/opencode/test/provider/provider.test.ts b/packages/opencode/test/provider/provider.test.ts
index cdb9d2057245..a7d1ef6a13da 100644
--- a/packages/opencode/test/provider/provider.test.ts
+++ b/packages/opencode/test/provider/provider.test.ts
@@ -297,6 +297,7 @@ test("custom provider with npm package", async () => {
       expect(providers[ProviderID.make("custom-provider")]).toBeDefined()
       expect(providers[ProviderID.make("custom-provider")].name).toBe("Custom Provider")
       expect(providers[ProviderID.make("custom-provider")].models["custom-model"]).toBeDefined()
+      expect(providers[ProviderID.make("custom-provider")].models["custom-model"].capabilities.temperature).toBe(true)
     },
   })
 })