diff --git a/.changeset/quiet-rabbits-bathe.md b/.changeset/quiet-rabbits-bathe.md
new file mode 100644
index 00000000..cbd13a6b
--- /dev/null
+++ b/.changeset/quiet-rabbits-bathe.md
@@ -0,0 +1,10 @@
+---
+"task-master-ai": patch
+---
+
+Fix max_tokens limits for OpenRouter and Groq models
+
+- Add special handling in config-manager.js for custom OpenRouter models to use a conservative default of 32,768 max_tokens
+- Update qwen/qwen-turbo model max_tokens from 1,000,000 to 32,768 to match OpenRouter's actual limits
+- Fix moonshotai/kimi-k2-instruct max_tokens to 16,384 to match Groq's actual limit (fixes #1028)
+- This prevents "maximum context length exceeded" errors when using OpenRouter models not in our supported models list
\ No newline at end of file
diff --git a/scripts/modules/config-manager.js b/scripts/modules/config-manager.js
index 2f8211b6..f71a0662 100644
--- a/scripts/modules/config-manager.js
+++ b/scripts/modules/config-manager.js
@@ -584,10 +584,21 @@ function getParametersForRole(role, explicitRoot = null) {
 				);
 			}
 		} else {
-			log(
-				'debug',
-				`No model definitions found for provider ${providerName} in MODEL_MAP. Using role default maxTokens: ${roleMaxTokens}`
-			);
+			// Special handling for custom OpenRouter models
+			if (providerName === CUSTOM_PROVIDERS.OPENROUTER) {
+				// Use a conservative default for OpenRouter models not in our list
+				const openrouterDefault = 32768;
+				effectiveMaxTokens = Math.min(roleMaxTokens, openrouterDefault);
+				log(
+					'debug',
+					`Custom OpenRouter model ${modelId} detected. Using conservative max_tokens: ${effectiveMaxTokens}`
+				);
+			} else {
+				log(
+					'debug',
+					`No model definitions found for provider ${providerName} in MODEL_MAP. Using role default maxTokens: ${roleMaxTokens}`
+				);
+			}
 		}
 	} catch (lookupError) {
 		log(
diff --git a/scripts/modules/supported-models.json b/scripts/modules/supported-models.json
index abcdd56f..0409cbc8 100644
--- a/scripts/modules/supported-models.json
+++ b/scripts/modules/supported-models.json
@@ -333,7 +333,7 @@
 				"output": 3.0
 			},
 			"allowed_roles": ["main", "fallback"],
-			"max_tokens": 131072,
+			"max_tokens": 16384,
 			"supported": true
 		},
 		{
@@ -701,7 +701,7 @@
 				"output": 0.2
 			},
 			"allowed_roles": ["main", "fallback"],
-			"max_tokens": 1000000,
+			"max_tokens": 32768,
 			"supported": true
 		},
 		{