diff --git a/open-sse/executors/opencode-zen.js b/open-sse/executors/opencode-zen.js
index 8a43ff85411..3debe06e4eb 100644
--- a/open-sse/executors/opencode-zen.js
+++ b/open-sse/executors/opencode-zen.js
@@ -15,7 +15,7 @@ const MAX_SESSION_LENGTH = 256;
 
 const RESPONSES_BASE_URL = "https://opencode.ai/zen/v1/responses";
 const MAX_TOOL_NAME_LEN = 128;
-const OPENCODE_UA = "opencode/1.18.31";
+const OPENCODE_UA = "opencode/latest/2.0.29/cli";
 export const OPENCODE_SESSION_RE = /^ses_[0-9a-f]{12}[0-9A-Za-z]{14}$/;
 const BASE62_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
 // Free-tier fingerprint (mirrors opencode executor, PR #4132): upstream 403s
@@ -23,11 +23,21 @@ const BASE62_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuv
 const OPENCODE_FINGERPRINT_TOOLS = ["bash", "glob", "grep", "read"];
 
 function hasValidOpencodeVersion(ua) {
-  const m = String(ua || "").match(/opencode\/(\d+)\.(\d+)(?:\.(\d+))?/i);
-  if (!m) return false;
-  const major = parseInt(m[1], 10);
-  const minor = parseInt(m[2], 10);
-  return major > 1 || (major === 1 && minor >= 17);
+  // Accept both legacy "opencode/1.18.31" and channel form
+  // "opencode/latest/2.0.29/cli" (official CLI since 2.0, issue #4837/#4861).
+  const legacy = String(ua || "").match(/opencode\/(\d+)\.(\d+)(?:\.(\d+))?/i);
+  if (legacy) {
+    const major = parseInt(legacy[1], 10);
+    const minor = parseInt(legacy[2], 10);
+    return major > 1 || (major === 1 && minor >= 17);
+  }
+  const channel = String(ua || "").match(/opencode\/[a-z-]+\/(\d+)\.(\d+)(?:\.(\d+))?/i);
+  if (channel) {
+    const major = parseInt(channel[1], 10);
+    const minor = parseInt(channel[2], 10);
+    return major > 1 || (major === 1 && minor >= 17);
+  }
+  return false;
 }
 
 function unstableRandom() {
diff --git a/open-sse/executors/opencode.js b/open-sse/executors/opencode.js
index 4623dcf6e36..cfa813693a8 100644
--- a/open-sse/executors/opencode.js
+++ b/open-sse/executors/opencode.js
@@ -15,7 +15,7 @@ import {
   coerceResponsesOutput,
 } from "../translator/formats/responsesApi.js";
 
-const OPENCODE_UA = "opencode/1.18.31";
+const OPENCODE_UA = "opencode/latest/2.0.29/cli";
 const MAX_SESSION_LENGTH = 256;
 const MAX_TOOL_NAME_LEN = 128;
 const SESSION_HEADER = "x-opencode-session";
@@ -26,11 +26,21 @@ export const OPENCODE_REQUEST_RE = /^msg_[0-9a-f]{12}[0-9A-Za-z]{14}$/;
 const BASE62_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
 
 function hasValidOpencodeVersion(ua) {
-  const m = String(ua || "").match(/opencode\/(\d+)\.(\d+)(?:\.(\d+))?/i);
-  if (!m) return false;
-  const major = parseInt(m[1], 10);
-  const minor = parseInt(m[2], 10);
-  return major > 1 || (major === 1 && minor >= 17);
+  // Accept both legacy "opencode/1.18.31" and channel form
+  // "opencode/latest/2.0.29/cli" (official CLI since 2.0, issue #4837/#4861).
+  const legacy = String(ua || "").match(/opencode\/(\d+)\.(\d+)(?:\.(\d+))?/i);
+  if (legacy) {
+    const major = parseInt(legacy[1], 10);
+    const minor = parseInt(legacy[2], 10);
+    return major > 1 || (major === 1 && minor >= 17);
+  }
+  const channel = String(ua || "").match(/opencode\/[a-z-]+\/(\d+)\.(\d+)(?:\.(\d+))?/i);
+  if (channel) {
+    const major = parseInt(channel[1], 10);
+    const minor = parseInt(channel[2], 10);
+    return major > 1 || (major === 1 && minor >= 17);
+  }
+  return false;
 }
 // Models served by /zen/v1/responses; every other model stays on /chat/completions.
 const RESPONSES_MODELS = new Set([
@@ -475,7 +485,7 @@ export class OpenCodeExecutor extends BaseExecutor {
       "Content-Type": "application/json",
       "Authorization": "Bearer public",
       "User-Agent": isOpencodeDownstream ? downstreamUa : OPENCODE_UA,
-      "x-opencode-client": lower["x-opencode-client"] || "desktop",
+      "x-opencode-client": lower["x-opencode-client"] || "cli",
       "x-opencode-session": session,
       "x-opencode-request": requestId,
       "x-opencode-project": lower["x-opencode-project"] || "global",
diff --git a/open-sse/providers/registry/opencode-zen.js b/open-sse/providers/registry/opencode-zen.js
index 7252d7a4547..532c0b4a0de 100644
--- a/open-sse/providers/registry/opencode-zen.js
+++ b/open-sse/providers/registry/opencode-zen.js
@@ -123,7 +123,7 @@ export default {
     baseUrl: "https://opencode.ai/zen/v1/systemone",
     headers: {
       "x-opencode-client": "desktop",
-      "User-Agent": "opencode/1.18.31",
+      "User-Agent": "opencode/latest/2.0.29/cli",
     },
   },
   modelsFetcher: { url: "https://opencode.ai/zen/v1/models", type: "opencode-free" },
diff --git a/open-sse/providers/registry/opencode.js b/open-sse/providers/registry/opencode.js
index 5a7926efbdd..473d98180d8 100644
--- a/open-sse/providers/registry/opencode.js
+++ b/open-sse/providers/registry/opencode.js
@@ -35,7 +35,7 @@ export default {
     baseUrl: "https://opencode.ai/zen/v1/systemone",
     headers: {
       "x-opencode-client": "desktop",
-      "User-Agent": "opencode/1.18.31",
+      "User-Agent": "opencode/latest/2.0.29/cli",
     },
   },
   modelsFetcher: { url: "https://opencode.ai/zen/v1/models", type: "opencode-free" },
diff --git a/src/app/api/providers/[id]/test/testUtils.js b/src/app/api/providers/[id]/test/testUtils.js
index 20a3060f3c6..46c872bb6cc 100644
--- a/src/app/api/providers/[id]/test/testUtils.js
+++ b/src/app/api/providers/[id]/test/testUtils.js
@@ -798,7 +798,7 @@ async function testApiKeyConnection(connection, effectiveProxy = null) {
       }
       case "opencode": {
         const res = await fetchWithConnectionProxy("https://opencode.ai/zen/v1/models", {
-          headers: { Authorization: "Bearer public", "User-Agent": "opencode/1.18.31" },
+          headers: { Authorization: "Bearer public", "User-Agent": "opencode/latest/2.0.29/cli" },
         }, effectiveProxy);
         return { valid: res.ok, error: res.ok ? null : "OpenCode free tier unavailable" };
       }