diff --git a/README.md b/README.md
index 8c29c23..795635b 100644
--- a/README.md
+++ b/README.md
@@ -125,7 +125,7 @@ Using these rules, everyone can build their own copy of Bantam from scratch in l
 ### Agentic loop (`AL(cfg, messages)`) function
 
 1. Call OpenAI-compatible Completions API (`POST {endpoint}/chat/completions`) forwarding relevant parameters from `cfg` (`model`, `temperature`, `stream`, `reasoning_effort`, etc., excluding internal agent configs like `endpoint`, `api_key`, `timeout`, `shell_timeout`, `max_al_iterations`, `color`, `context_window`) and optional `api_key` bearer header.
-   - Set custom request headers. If the endpoint host is `opencode.ai` (or a subdomain), send the OpenCode Zen header set: `User-Agent: opencode/1.18.31 ai-sdk/provider-utils/4.0.23 runtime/bun/1.3.14`, `x-opencode-client: cli`, `x-opencode-project: <project-md5>`, `x-opencode-session: <ses_...>`, and a fresh `x-opencode-request: msg_<26 base32 chars>` per call. For every other endpoint, keep the legacy `User-Agent: opencode/1.18.31` plus `X-Session-Id` and `x-session-affinity`. The `Authorization: Bearer <api_key>` header is added whenever `api_key` is set and not `-`.
+   - Set custom request headers. If the endpoint host is `opencode.ai` (or a subdomain), send the OpenCode Zen header set: `User-Agent: opencode/1.18.31 ai-sdk/provider-utils/4.0.23 runtime/bun/1.3.14`, `x-opencode-client: cli`, `x-opencode-project: global`, `x-opencode-session: <ses_...>`, and a fresh `x-opencode-request: msg_<26 base32 chars>` per call. For every other endpoint, keep the legacy `User-Agent: opencode/1.18.31` plus `X-Session-Id` and `x-session-affinity`. The `Authorization: Bearer <api_key>` header is added whenever `api_key` is set and not `-`.
    - Retry network/HTTP errors with Fibonacci backoff delays (`1s, 1s, 2s, 3s, 5s, 8s, 13s, 21s, 34s`).
    - If `stream=true`, parse SSE stream (`data: {...}`) for real-time reasoning and text output, bracketing reasoning with `--- reasoning start ---` / `--- reasoning end ---` markers.
 2. Append the assistant's response message object to `messages`. If non-streaming and response has reasoning tokens (`reasoning_content` or `reasoning`), output them wrapped in `--- reasoning start ---` / `--- reasoning end ---` markers.
diff --git a/main.go b/main.go
index b53cd4d..a3530a3 100644
--- a/main.go
+++ b/main.go
@@ -90,6 +90,7 @@ var defCfg = Cfg{"https://api.kilo.ai/api/openrouter", "openrouter/free", "-", 0
 const opencodeAgentVersion = "opencode/1.18.31"
 const opencodeProviderUA = "ai-sdk/provider-utils/4.0.23 runtime/bun/1.3.14"
 const opencodeIDAlphabet = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
+const opencodeProjectID = "global"
 
 func atoiD(s string, d int) int {
   if v, e := strconv.Atoi(strings.TrimSpace(s)); e == nil {
@@ -1721,7 +1722,7 @@ func applyLLMHeaders(req *http.Request, cfg *Cfg, msgID string) {
   if isOpencodeEndpoint(cfg.Endpoint) {
     req.Header.Set("User-Agent", opencodeAgentVersion+" "+opencodeProviderUA)
     req.Header.Set("x-opencode-client", "cli")
-    req.Header.Set("x-opencode-project", projectID())
+    req.Header.Set("x-opencode-project", opencodeProjectID)
     req.Header.Set("x-opencode-session", sid)
     req.Header.Set("x-opencode-request", msgID)
   } else {
diff --git a/main_test.go b/main_test.go
index 91cc7d6..2f4c59b 100644
--- a/main_test.go
+++ b/main_test.go
@@ -1254,8 +1254,8 @@ func TestApplyLLMHeadersOpencode(t *testing.T) {
   if got := req.Header.Get("x-opencode-client"); got != "cli" {
     t.Errorf("x-opencode-client = %q, want cli", got)
   }
-  if got := req.Header.Get("x-opencode-project"); got != projectID() {
-    t.Errorf("x-opencode-project = %q, want %q", got, projectID())
+  if got := req.Header.Get("x-opencode-project"); got != "global" {
+    t.Errorf("x-opencode-project = %q, want global", got)
   }
   if got := req.Header.Get("x-opencode-session"); got != opencodeSessionID() {
     t.Errorf("x-opencode-session = %q, want %q", got, opencodeSessionID())
@@ -1271,6 +1271,26 @@ func TestApplyLLMHeadersOpencode(t *testing.T) {
   }
 }
 
+func TestApplyLLMHeadersRequestID(t *testing.T) {
+  cfg := defCfg
+  cfg.Endpoint = "https://opencode.ai/zen/v1"
+  cfg.APIKey = "-"
+  req, _ := http.NewRequest("POST", "https://opencode.ai/zen/v1/chat/completions", nil)
+  applyLLMHeaders(req, &cfg, ocRequestID())
+  got := req.Header.Get("x-opencode-request")
+  if !strings.HasPrefix(got, "msg_") {
+    t.Errorf("x-opencode-request = %q, want msg_ prefix", got)
+  }
+  if len(got) != 30 {
+    t.Errorf("x-opencode-request length = %d, want 30: %q", len(got), got)
+  }
+  for _, c := range got[4:] {
+    if !strings.ContainsRune(opencodeIDAlphabet, c) {
+      t.Errorf("invalid character %c in x-opencode-request %q", c, got)
+    }
+  }
+}
+
 func TestApplyLLMHeadersOpencodeAuth(t *testing.T) {
   cfg := defCfg
   cfg.Endpoint = "https://opencode.ai/zen/v1"