diff --git a/packages/adapter-deepseek/src/client.ts b/packages/adapter-deepseek/src/client.ts
index aebda8d41..11924afdf 100644
--- a/packages/adapter-deepseek/src/client.ts
+++ b/packages/adapter-deepseek/src/client.ts
@@ -115,6 +115,7 @@ export class DeepseekClient extends PlatformModelAndEmbeddingsClient<ClientConfi
                 modelInfo: info,
                 requester: this._requester,
                 model,
+                modelMaxContextSize: info.maxTokens,
                 maxTokenLimit: Math.floor(
                     (info.maxTokens || 1_000_000) * this._config.maxContextRatio
                 ),
diff --git a/packages/adapter-doubao/src/client.ts b/packages/adapter-doubao/src/client.ts
index 88ec8d9b3..e6b3e1f95 100644
--- a/packages/adapter-doubao/src/client.ts
+++ b/packages/adapter-doubao/src/client.ts
@@ -163,6 +163,7 @@ export class DouBaoClient extends PlatformModelAndEmbeddingsClient<ClientConfig>
                 modelInfo: info,
                 requester: this._requester,
                 model,
+                modelMaxContextSize: info.maxTokens,
                 maxTokenLimit: Math.floor(
                     (info.maxTokens || 100_000) * this._config.maxContextRatio
                 ),
diff --git a/packages/shared-adapter/src/client.ts b/packages/shared-adapter/src/client.ts
index 867191cf2..b378db50a 100644
--- a/packages/shared-adapter/src/client.ts
+++ b/packages/shared-adapter/src/client.ts
@@ -128,7 +128,7 @@ export function getModelMaxContextSize(info: ModelInfo): number {
         'gemini-3.0-pro': 1_097_152,
         'gemini-3.1-pro': 1_097_152,
         'gemini-2.0': 2097152,
-        deepseek: 128000,
+        deepseek: 1_000_000,
         'llama3.1': 128000,
         'command-r-plus': 128000,
         'moonshot-v1-8k': 8192,