diff --git a/src/coding_agent_bench/helpers/codex.py b/src/coding_agent_bench/helpers/codex.py
index a4d3b49..71d22f0 100644
--- a/src/coding_agent_bench/helpers/codex.py
+++ b/src/coding_agent_bench/helpers/codex.py
@@ -1,18 +1,17 @@
+import json
 from pathlib import Path
 
-TEMPLATE = """profile = "custom-vllm"
+
+TEMPLATE = """model = {model_name}
+model_provider = "vllm"
 web_search = "disabled"
 
 [model_providers.vllm]
 name = "vllm"
-base_url = "{server_url}/v1"
+base_url = {base_url}
 wire_api = "responses"
 requires_openai_auth = false
 
-[profiles.custom-vllm]
-model_provider = "vllm"
-model = "{model_name}"
-
 [features]
 js_repl = false
 multi_agent = true
@@ -22,7 +21,16 @@
 """
 
 
+def _toml_string(value: str) -> str:
+    return json.dumps(value)
+
+
 def codex_create_toml(model_name: str, server_url: str, outpath: Path):
-    toml = TEMPLATE.format(model_name=model_name, server_url=server_url)
+    base_url = f"{server_url.rstrip('/')}/v1"
+    toml = TEMPLATE.format(
+        model_name=_toml_string(model_name),
+        base_url=_toml_string(base_url),
+    )
+
     with open(outpath, "w") as f:
         f.write(toml)