diff --git a/README.md b/README.md
index 3571ea3..01a693b 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,9 @@ also supports `picker`. Codex review and subagents also support `inherit`.
 Native is always the default.
 
 For Codex, Kenari detects whether `codex login` uses ChatGPT or an API key and
-keeps native requests on the matching OpenAI upstream.
+keeps native requests on the matching OpenAI upstream. The process-scoped
+router disables request compression and WebSocket transport so it can inspect
+the model ID before selecting the upstream.
 
 Automation must set every role:
 
diff --git a/package.json b/package.json
index bcb41da..12171d3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kenarihq/cli",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "Official kenari CLI. Route Claude Code and Codex models per process.",
   "license": "MIT",
   "type": "module",
diff --git a/src/runtime/codex.js b/src/runtime/codex.js
index a30ade1..25207e9 100644
--- a/src/runtime/codex.js
+++ b/src/runtime/codex.js
@@ -75,6 +75,16 @@ export function codexKenariModels(cache, nativeModels = []) {
 export function buildCodexLaunch(options) {
   const inputArgs = options.args || [];
   for (let index = 0; index < inputArgs.length; index += 1) {
+    if (inputArgs[index] === '--enable') {
+      if (inputArgs[index + 1] === 'enable_request_compression') {
+        throw new KenariError('unsafe Codex routing override: enable_request_compression');
+      }
+      index += 1;
+      continue;
+    }
+    if (inputArgs[index] === '--enable=enable_request_compression') {
+      throw new KenariError('unsafe Codex routing override: enable_request_compression');
+    }
     if (inputArgs[index] === '--oss' || inputArgs[index] === '--local-provider'
       || inputArgs[index].startsWith('--local-provider=')) {
       throw new KenariError(`unsafe Codex routing override: ${inputArgs[index]}`);
@@ -85,7 +95,12 @@ export function buildCodexLaunch(options) {
     if (inline === null && !['-c', '--config'].includes(inputArgs[index])) continue;
     const value = inline ?? inputArgs[index + 1] ?? '';
     const key = value.split('=', 1)[0].trim();
-    if (['model_provider', 'openai_base_url', 'model_catalog_json'].includes(key)
+    if ([
+      'model_provider',
+      'openai_base_url',
+      'model_catalog_json',
+      'features.enable_request_compression',
+    ].includes(key)
       || key.startsWith('model_providers.')) {
       throw new KenariError(`unsafe Codex routing override: ${key}`);
     }
@@ -99,6 +114,7 @@ export function buildCodexLaunch(options) {
     `model_providers.${CODEX_ROUTER_PROVIDER}.requires_openai_auth=true`,
     `model_providers.${CODEX_ROUTER_PROVIDER}.supports_websockets=false`,
     `model_providers.${CODEX_ROUTER_PROVIDER}.supports_standalone_web_search=true`,
+    'features.enable_request_compression=false',
   ];
   if (options.catalogPath) {
     overrides.push(`model_catalog_json=${tomlString(options.catalogPath)}`);
diff --git a/test/v2-runtime-supervisor.test.js b/test/v2-runtime-supervisor.test.js
index 62837ef..d798c39 100644
--- a/test/v2-runtime-supervisor.test.js
+++ b/test/v2-runtime-supervisor.test.js
@@ -133,6 +133,7 @@ test('Codex launch injects temporary controls before original args', () => {
   ));
   assert.ok(built.args.includes('model_providers.kenari_router.requires_openai_auth=true'));
   assert.ok(built.args.includes('model_providers.kenari_router.supports_websockets=false'));
+  assert.ok(built.args.includes('features.enable_request_compression=false'));
   assert.equal(built.env.OPENAI_API_KEY, 'secret');
   assert.equal(built.env.KEEP, 'yes');
   const native = [{
@@ -149,6 +150,18 @@ test('Codex launch injects temporary controls before original args', () => {
     routerUrl: 'http://127.0.0.1:2',
     args: ['-c', 'openai_base_url="https://bypass.example"'],
   }), /unsafe Codex routing override/);
+  for (const args of [
+    ['-c', 'features.enable_request_compression=true'],
+    ['--config=features.enable_request_compression=true'],
+    ['--enable', 'enable_request_compression'],
+    ['--enable=enable_request_compression'],
+  ]) {
+    assert.throws(() => buildCodexLaunch({
+      toolConfig: { roles: {} },
+      routerUrl: 'http://127.0.0.1:2',
+      args,
+    }), /unsafe Codex routing override/, args.join(' '));
+  }
 });
 
 test('Codex native upstream follows the active login method', () => {