diff --git a/src/app/v1/_lib/proxy/session-guard.ts b/src/app/v1/_lib/proxy/session-guard.ts
index 069ae05e..b2685555 100644
--- a/src/app/v1/_lib/proxy/session-guard.ts
+++ b/src/app/v1/_lib/proxy/session-guard.ts
@@ -85,12 +85,11 @@ export class ProxySessionGuard {
         systemSettings.interceptAnthropicWarmupRequests;
 
       // 1. 尝试从客户端提取 session_id（metadata.session_id）
-      const clientSessionId =
-        SessionManager.extractClientSessionId(
-          session.request.message,
-          session.headers,
-          session.userAgent
-        ) || session.generateDeterministicSessionId();
+      const clientSessionId = SessionManager.extractClientSessionId(
+        session.request.message,
+        session.headers,
+        session.userAgent
+      );
 
       // 2. 获取 messages 数组
       const messages = session.getMessages();
diff --git a/src/app/v1/_lib/proxy/session.ts b/src/app/v1/_lib/proxy/session.ts
index c6c2ba9f..a163c772 100644
--- a/src/app/v1/_lib/proxy/session.ts
+++ b/src/app/v1/_lib/proxy/session.ts
@@ -1,4 +1,3 @@
-import crypto from "node:crypto";
 import type { Context } from "hono";
 import { logger } from "@/lib/logger";
 import { clientRequestsContext1m as clientRequestsContext1mHelper } from "@/lib/special-attributes";
@@ -352,38 +351,6 @@ export class ProxySession {
     return this.providersSnapshot;
   }
 
-  /**
-   * 生成基于请求指纹的确定性 Session ID
-   *
-   * 优先级与参考实现一致：
-   * - API Key 前缀（x-api-key / x-goog-api-key 的前10位）
-   * - User-Agent
-   * - 客户端 IP（x-forwarded-for / x-real-ip）
-   *
-   * 当客户端未提供 metadata.session_id 时，可用于稳定绑定会话。
-   */
-  generateDeterministicSessionId(): string | null {
-    const apiKeyHeader = this.headers.get("x-api-key") || this.headers.get("x-goog-api-key");
-    const apiKeyPrefix = apiKeyHeader ? apiKeyHeader.substring(0, 10) : null;
-
-    const userAgent = this.headers.get("user-agent");
-
-    // 取链路上的首个 IP
-    const forwardedFor = this.headers.get("x-forwarded-for");
-    const realIp = this.headers.get("x-real-ip");
-    const ip =
-      forwardedFor?.split(",").map((ip) => ip.trim())[0] || (realIp ? realIp.trim() : null);
-
-    const parts = [userAgent, ip, apiKeyPrefix].filter(Boolean);
-    if (parts.length === 0) {
-      return null;
-    }
-
-    const hash = crypto.createHash("sha256").update(parts.join(":"), "utf8").digest("hex");
-    // 格式对齐为 sess_{8位}_{12位}
-    return `sess_${hash.substring(0, 8)}_${hash.substring(8, 20)}`;
-  }
-
   /**
    * 获取 messages 数组长度（支持 Claude、Codex 和 Gemini 格式）
    */
diff --git a/tests/unit/proxy/metadata-injection.test.ts b/tests/unit/proxy/metadata-injection.test.ts
index f783bd07..c000d1f4 100644
--- a/tests/unit/proxy/metadata-injection.test.ts
+++ b/tests/unit/proxy/metadata-injection.test.ts
@@ -128,18 +128,3 @@ describe("injectClaudeMetadataUserId", () => {
     expect(metadata.user_id).toMatch(/^user_[a-f0-9]{64}_account__session_sess_abc123$/);
   });
 });
-
-describe("ProxySession.generateDeterministicSessionId", () => {
-  it("输出格式应匹配 sess_{8hex}_{12hex}", () => {
-    const session = Object.create(ProxySession.prototype) as ProxySession;
-    (session as Record<string, unknown>).headers = new Headers([
-      ["x-api-key", "sk-test-abcdef123456"],
-      ["user-agent", "Vitest/1.0"],
-      ["x-forwarded-for", "203.0.113.1"],
-    ]);
-
-    const deterministicSessionId = session.generateDeterministicSessionId();
-
-    expect(deterministicSessionId).toMatch(/^sess_[a-f0-9]{8}_[a-f0-9]{12}$/);
-  });
-});
diff --git a/tests/unit/proxy/session-guard-warmup-intercept.test.ts b/tests/unit/proxy/session-guard-warmup-intercept.test.ts
index 9d366056..f7443b93 100644
--- a/tests/unit/proxy/session-guard-warmup-intercept.test.ts
+++ b/tests/unit/proxy/session-guard-warmup-intercept.test.ts
@@ -81,9 +81,6 @@ function createMockSession(overrides: Partial<ProxySession> = {}): ProxySession
     getRequestSequence() {
       return this.requestSequence ?? 1;
     },
-    generateDeterministicSessionId() {
-      return "deterministic_session_id";
-    },
     getMessages() {
       return [];
     },