diff --git a/pkg/workflow/codex_engine_test.go b/pkg/workflow/codex_engine_test.go
index d8f1cddc6eb..8714926752d 100644
--- a/pkg/workflow/codex_engine_test.go
+++ b/pkg/workflow/codex_engine_test.go
@@ -344,7 +344,6 @@ func TestCodexEngineRenderMCPConfigOpenAIProxyProvider(t *testing.T) {
 			"[model_providers.openai-proxy]",
 			"name = \"OpenAI AWF proxy\"",
 			fmt.Sprintf("base_url = \"http://%s:%d\"", constants.AWFAPIProxyContainerIP, constants.ClaudeLLMGatewayPort),
-			"env_key = \"OPENAI_API_KEY\"",
 			"supports_websockets = false",
 		}
 
diff --git a/pkg/workflow/codex_mcp.go b/pkg/workflow/codex_mcp.go
index 71f5ba7c044..f4859d2afa2 100644
--- a/pkg/workflow/codex_mcp.go
+++ b/pkg/workflow/codex_mcp.go
@@ -161,7 +161,6 @@ func (e *CodexEngine) renderOpenAIProxyProviderToml(yaml *strings.Builder, inden
 	yaml.WriteString(indent + "[model_providers." + codexOpenAIProxyProviderID + "]\n")
 	yaml.WriteString(indent + "name = \"" + codexOpenAIProxyProviderName + "\"\n")
 	yaml.WriteString(indent + "base_url = \"" + e.getOpenAIProxyProviderBaseURL() + "\"\n")
-	yaml.WriteString(indent + "env_key = \"OPENAI_API_KEY\"\n")
 	yaml.WriteString(indent + "supports_websockets = false\n")
 }
 
diff --git a/pkg/workflow/testdata/TestWasmGolden_AllEngines/codex.golden b/pkg/workflow/testdata/TestWasmGolden_AllEngines/codex.golden
index 110fef4006a..2d12e1a0bcd 100644
--- a/pkg/workflow/testdata/TestWasmGolden_AllEngines/codex.golden
+++ b/pkg/workflow/testdata/TestWasmGolden_AllEngines/codex.golden
@@ -453,7 +453,6 @@ jobs:
           [model_providers.openai-proxy]
           name = "OpenAI AWF proxy"
           base_url = "http://172.30.0.30:10000"
-          env_key = "OPENAI_API_KEY"
           supports_websockets = false
           [shell_environment_policy]
           inherit = "core"