diff --git a/package.json b/package.json
index d023a15a..1305cdcf 100644
--- a/package.json
+++ b/package.json
@@ -162,7 +162,7 @@
       {
         "command": "vectorcastTestExplorer.removeTestsuite",
         "category": "VectorCAST Test Explorer",
-        "title": "Remove Environment from Testsuite"  
+        "title": "Remove Environment from Testsuite"
       },
       {
         "command": "vectorcastTestExplorer.newEnviroVCAST",
@@ -487,8 +487,20 @@
             "type": "string",
             "order": 7,
             "default": "openai",
-            "enum": ["openai", "azure_openai", "anthropic", "litellm"],
-            "enumDescriptions": ["OpenAI", "Azure OpenAI", "Anthropic", "LiteLLM"],
+            "enum": [
+              "openai",
+              "azure_openai",
+              "anthropic",
+              "litellm",
+              "openai_at"
+            ],
+            "enumDescriptions": [
+              "OpenAI",
+              "Azure OpenAI",
+              "Anthropic",
+              "LiteLLM",
+              "OpenAI (Access Token)"
+            ],
             "description": "Language model provider for automatic requirements and test generation using Reqs2X"
           },
           "vectorcastTestExplorer.reqs2x.openai.apiKey": {
@@ -593,6 +605,37 @@
             "default": "",
             "description": "Environment variables to set when running LiteLLM, e.g., OPENAI_API_KEY=xxxx. Multiple variables can be separated by commas, e.g., OPENAI_API_KEY=xxxx,ANOTHER_ENV_VAR=yyyy. For a list of variables to set for a specific LiteLLM-compatible provider, see https://docs.litellm.ai/docs/providers."
           }
+          ,
+          "vectorcastTestExplorer.reqs2x.openai_at.modelName": {
+            "type": "string",
+            "order": 25,
+            "default": "",
+            "description": "OpenAI AT model name"
+          },
+          "vectorcastTestExplorer.reqs2x.openai_at.modelUrl": {
+            "type": "string",
+            "order": 26,
+            "default": "",
+            "description": "OpenAI AT model URL"
+          },
+          "vectorcastTestExplorer.reqs2x.openai_at.authUrl": {
+            "type": "string",
+            "order": 27,
+            "default": "",
+            "description": "OpenAI AT authentication URL"
+          },
+          "vectorcastTestExplorer.reqs2x.openai_at.appKey": {
+            "type": "string",
+            "order": 28,
+            "default": "",
+            "description": "OpenAI AT application key"
+          },
+          "vectorcastTestExplorer.reqs2x.openai_at.appSecret": {
+            "type": "string",
+            "order": 29,
+            "default": "",
+            "description": "OpenAI AT application secret"
+          }
         }
       }
     ],
@@ -936,173 +979,173 @@
           "group": "vcast@3"
         }
       ],
-    "vectorcastTestExplorer.vcastsubmenu": [
-      {
-        "command": "vectorcastTestExplorer.openProjectInVectorCAST",
-        "group": "vcast.project",
-        "when": "testId =~ /\\.vcm$/ || testId in vectorcastTestExplorer.globalProjectCompilers || testId in vectorcastTestExplorer.globalProjectTestsuites"
-      },
-      {
-        "command": "vectorcastTestExplorer.addCompilerToProject",
-        "group": "vcast.project",
-        "when": "testId =~ /\\.vcm$/"
-      },
-      {
-        "command": "vectorcastTestExplorer.addEnviroToProject",
-        "group": "vcast.project",
-        "when": "testId =~ /\\.vcm$/"
-      },
-      {
-        "command": "vectorcastTestExplorer.newCompilerInProjectVCAST",
-        "group": "vcast.project",
-        "when": "testId =~ /\\.vcm$/"
-      },
-      {
-        "command": "vectorcastTestExplorer.addTestsuiteToCompiler",
-        "group": "vcast.project",
-        "when": "testId in vectorcastTestExplorer.globalProjectCompilers"
-      },
-      {
-        "command": "vectorcastTestExplorer.updateProjectEnvironment",
-        "group": "vcast.project",
-        "when": "(testId =~ /^vcast:.*$/ && (testId in vectorcastTestExplorer.vcastUnbuiltEnviroList || testId in vectorcastTestExplorer.vcastEnviroList) && vectorcastTestExplorer.globalProjectIsOpenedChecker) && !config.vectorcastTestExplorer.automaticallyUpdateManageProject"
-      },
-      {
-        "command": "vectorcastTestExplorer.buildProjectEnviro",
-        "group": "vcast.build",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.getEnvFullReport",
-        "group": "vcast.build",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.buildExecuteIncremental",
-        "group": "vcast.build",
-        "when": "vectorcastTestExplorer.globalProjectIsOpenedChecker && ( testId =~ /\\.vcm$/ || testId in vectorcastTestExplorer.globalProjectCompilers || testId in vectorcastTestExplorer.globalProjectTestsuites || (testId =~ /^vcast:.*$/ && ( testId in vectorcastTestExplorer.vcastEnviroList || testId in vectorcastTestExplorer.vcastUnbuiltEnviroList)))"
-      },
-      {
-        "command": "vectorcastTestExplorer.rebuildEnviro",
-        "group": "vcast.build",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.cleanEnviro",
-        "group": "vcast.build",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.globalProjectIsOpenedChecker && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.openVCAST",
-        "group": "vcast.enviroManagement",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.deleteEnviro",
-        "group": "vcast.enviroManagement",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && !vectorcastTestExplorer.globalProjectIsOpenedChecker"
-      },
-      {
-        "command": "vectorcastTestExplorer.deleteEnviroFromProject",
-        "group": "vcast.enviroManagement",
-        "when": "testId =~ /^vcast:.*$/ && (testId in vectorcastTestExplorer.vcastUnbuiltEnviroList || testId in vectorcastTestExplorer.vcastEnviroList) && vectorcastTestExplorer.globalProjectIsOpenedChecker"
-      },
-      {
-        "command": "vectorcastTestExplorer.removeTestsuite",
-        "group": "vcast.enviroManagement",
-        "when": "testId =~ /^vcast:.*$/ && (testId in vectorcastTestExplorer.vcastUnbuiltEnviroList || testId in vectorcastTestExplorer.vcastEnviroList) && vectorcastTestExplorer.globalProjectIsOpenedChecker"
-      },
-      {
-        "command": "vectorcastTestExplorer.editTestScript",
-        "group": "vcast.testScript",
-        "when": "testId =~ /^vcast:.*$/ && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.createTestScript",
-        "group": "vcast.testScript",
-        "when": "testId =~ /^vcast:.*$/ && testId not in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList && !(testId =~ /.*coded_tests_driver.*/ )"
-      },
-      {
-        "command": "vectorcastTestExplorer.editCodedTest",
-        "group": "vcast.testScript",
-        "when": "testId =~ /^vcast:.*$/ && testId not in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList && testId =~ /.*coded_tests_driver.+/"
-      },
-      {
-        "command": "vectorcastTestExplorer.addCodedTests",
-        "group": "vcast.testScript",
-        "when": "testId =~ /^vcast:.*$/ && testId =~ /.*coded_tests_driver$/ &&  testId not in vectorcastTestExplorer.vcastHasCodedTestsList"
-      },
-      {
-        "command": "vectorcastTestExplorer.generateCodedTests",
-        "group": "vcast.testScript",
-        "when": "testId =~ /^vcast:.*$/ && testId =~ /.*coded_tests_driver$/ &&  testId not in vectorcastTestExplorer.vcastHasCodedTestsList"
-      },
-      {
-        "command": "vectorcastTestExplorer.removeCodedTests",
-        "group": "vcast.testScript",
-        "when": "testId =~ /^vcast:.*$/ && testId =~ /.*coded_tests_driver$/ && testId in vectorcastTestExplorer.vcastHasCodedTestsList"
-      },
-      {
-        "command": "vectorcastTestExplorer.insertBasisPathTests",
-        "group": "vcast.testGeneration",
-        "when": "testId =~ /^vcast:.*$/ && !(testId =~ /^.*<<COMPOUND>>.*$/) && !(testId =~ /^.*<<INIT>>.*$/) && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.insertATGTests",
-        "group": "vcast.testGeneration",
-        "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.atgAvailable && !(testId =~ /^.*<<COMPOUND>>.*$/) && !(testId =~ /^.*<<INIT>>.*$/) && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.deleteTest",
-        "group": "vcast.delete",
-        "when": "testId =~ /^vcast:.*$/ && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      },
-      {
-        "command": "vectorcastTestExplorer.deleteTestsuite",
-        "group": "vcast.delete",
-        "when": "testId in vectorcastTestExplorer.globalProjectTestsuites"
-      },
-      {
-        "command": "vectorcastTestExplorer.deleteCompiler",
-        "group": "vcast.delete",
-        "when": "testId in vectorcastTestExplorer.globalProjectCompilers"
-      },
-      {
-        "command": "vectorcastTestExplorer.importRequirementsFromGateway",
-        "group": "vcast@8",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.reqs2xFeatureEnabled && testId not in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
-      },
-      {
-        "command": "vectorcastTestExplorer.generateRequirements",
-        "group": "vcast@8",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.reqs2xFeatureEnabled && testId not in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
-      },
-      {
-        "command": "vectorcastTestExplorer.showRequirements",
-        "group": "vcast@9",
-        "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.reqs2xFeatureEnabled && testId in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
-      },
-      {
-        "command": "vectorcastTestExplorer.generateTestsFromRequirements",
-        "group": "vcast@10",
-        "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.reqs2xFeatureEnabled"
-      },
-      {
-        "command": "vectorcastTestExplorer.removeRequirements",
-        "group": "vcast@9",
-        "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.reqs2xFeatureEnabled && testId in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
-      },
-      {
-        "command": "vectorcastTestExplorer.populateRequirementsGateway",
-        "group": "vcast@9",
-        "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.reqs2xFeatureEnabled && testId in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
-      },
-      {
-        "command": "vectorcastTestExplorer.viewResults",
-        "group": "vcast.results",
-        "when": "testId =~ /^vcast:.*$/ && testId not in vectorcastTestExplorer.vcastEnviroList  && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
-      }
-    ]
+      "vectorcastTestExplorer.vcastsubmenu": [
+        {
+          "command": "vectorcastTestExplorer.openProjectInVectorCAST",
+          "group": "vcast.project",
+          "when": "testId =~ /\\.vcm$/ || testId in vectorcastTestExplorer.globalProjectCompilers || testId in vectorcastTestExplorer.globalProjectTestsuites"
+        },
+        {
+          "command": "vectorcastTestExplorer.addCompilerToProject",
+          "group": "vcast.project",
+          "when": "testId =~ /\\.vcm$/"
+        },
+        {
+          "command": "vectorcastTestExplorer.addEnviroToProject",
+          "group": "vcast.project",
+          "when": "testId =~ /\\.vcm$/"
+        },
+        {
+          "command": "vectorcastTestExplorer.newCompilerInProjectVCAST",
+          "group": "vcast.project",
+          "when": "testId =~ /\\.vcm$/"
+        },
+        {
+          "command": "vectorcastTestExplorer.addTestsuiteToCompiler",
+          "group": "vcast.project",
+          "when": "testId in vectorcastTestExplorer.globalProjectCompilers"
+        },
+        {
+          "command": "vectorcastTestExplorer.updateProjectEnvironment",
+          "group": "vcast.project",
+          "when": "(testId =~ /^vcast:.*$/ && (testId in vectorcastTestExplorer.vcastUnbuiltEnviroList || testId in vectorcastTestExplorer.vcastEnviroList) && vectorcastTestExplorer.globalProjectIsOpenedChecker) && !config.vectorcastTestExplorer.automaticallyUpdateManageProject"
+        },
+        {
+          "command": "vectorcastTestExplorer.buildProjectEnviro",
+          "group": "vcast.build",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.getEnvFullReport",
+          "group": "vcast.build",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.buildExecuteIncremental",
+          "group": "vcast.build",
+          "when": "vectorcastTestExplorer.globalProjectIsOpenedChecker && ( testId =~ /\\.vcm$/ || testId in vectorcastTestExplorer.globalProjectCompilers || testId in vectorcastTestExplorer.globalProjectTestsuites || (testId =~ /^vcast:.*$/ && ( testId in vectorcastTestExplorer.vcastEnviroList || testId in vectorcastTestExplorer.vcastUnbuiltEnviroList)))"
+        },
+        {
+          "command": "vectorcastTestExplorer.rebuildEnviro",
+          "group": "vcast.build",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.cleanEnviro",
+          "group": "vcast.build",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.globalProjectIsOpenedChecker && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.openVCAST",
+          "group": "vcast.enviroManagement",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.deleteEnviro",
+          "group": "vcast.enviroManagement",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && !vectorcastTestExplorer.globalProjectIsOpenedChecker"
+        },
+        {
+          "command": "vectorcastTestExplorer.deleteEnviroFromProject",
+          "group": "vcast.enviroManagement",
+          "when": "testId =~ /^vcast:.*$/ && (testId in vectorcastTestExplorer.vcastUnbuiltEnviroList || testId in vectorcastTestExplorer.vcastEnviroList) && vectorcastTestExplorer.globalProjectIsOpenedChecker"
+        },
+        {
+          "command": "vectorcastTestExplorer.removeTestsuite",
+          "group": "vcast.enviroManagement",
+          "when": "testId =~ /^vcast:.*$/ && (testId in vectorcastTestExplorer.vcastUnbuiltEnviroList || testId in vectorcastTestExplorer.vcastEnviroList) && vectorcastTestExplorer.globalProjectIsOpenedChecker"
+        },
+        {
+          "command": "vectorcastTestExplorer.editTestScript",
+          "group": "vcast.testScript",
+          "when": "testId =~ /^vcast:.*$/ && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.createTestScript",
+          "group": "vcast.testScript",
+          "when": "testId =~ /^vcast:.*$/ && testId not in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList && !(testId =~ /.*coded_tests_driver.*/ )"
+        },
+        {
+          "command": "vectorcastTestExplorer.editCodedTest",
+          "group": "vcast.testScript",
+          "when": "testId =~ /^vcast:.*$/ && testId not in vectorcastTestExplorer.vcastEnviroList && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList && testId =~ /.*coded_tests_driver.+/"
+        },
+        {
+          "command": "vectorcastTestExplorer.addCodedTests",
+          "group": "vcast.testScript",
+          "when": "testId =~ /^vcast:.*$/ && testId =~ /.*coded_tests_driver$/ &&  testId not in vectorcastTestExplorer.vcastHasCodedTestsList"
+        },
+        {
+          "command": "vectorcastTestExplorer.generateCodedTests",
+          "group": "vcast.testScript",
+          "when": "testId =~ /^vcast:.*$/ && testId =~ /.*coded_tests_driver$/ &&  testId not in vectorcastTestExplorer.vcastHasCodedTestsList"
+        },
+        {
+          "command": "vectorcastTestExplorer.removeCodedTests",
+          "group": "vcast.testScript",
+          "when": "testId =~ /^vcast:.*$/ && testId =~ /.*coded_tests_driver$/ && testId in vectorcastTestExplorer.vcastHasCodedTestsList"
+        },
+        {
+          "command": "vectorcastTestExplorer.insertBasisPathTests",
+          "group": "vcast.testGeneration",
+          "when": "testId =~ /^vcast:.*$/ && !(testId =~ /^.*<<COMPOUND>>.*$/) && !(testId =~ /^.*<<INIT>>.*$/) && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.insertATGTests",
+          "group": "vcast.testGeneration",
+          "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.atgAvailable && !(testId =~ /^.*<<COMPOUND>>.*$/) && !(testId =~ /^.*<<INIT>>.*$/) && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.deleteTest",
+          "group": "vcast.delete",
+          "when": "testId =~ /^vcast:.*$/ && !(testId =~ /.*coded_tests_driver.*/) && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        },
+        {
+          "command": "vectorcastTestExplorer.deleteTestsuite",
+          "group": "vcast.delete",
+          "when": "testId in vectorcastTestExplorer.globalProjectTestsuites"
+        },
+        {
+          "command": "vectorcastTestExplorer.deleteCompiler",
+          "group": "vcast.delete",
+          "when": "testId in vectorcastTestExplorer.globalProjectCompilers"
+        },
+        {
+          "command": "vectorcastTestExplorer.importRequirementsFromGateway",
+          "group": "vcast@8",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.reqs2xFeatureEnabled && testId not in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
+        },
+        {
+          "command": "vectorcastTestExplorer.generateRequirements",
+          "group": "vcast@8",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.reqs2xFeatureEnabled && testId not in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
+        },
+        {
+          "command": "vectorcastTestExplorer.showRequirements",
+          "group": "vcast@9",
+          "when": "testId =~ /^vcast:.*$/ && testId in vectorcastTestExplorer.vcastEnviroList && vectorcastTestExplorer.reqs2xFeatureEnabled && testId in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
+        },
+        {
+          "command": "vectorcastTestExplorer.generateTestsFromRequirements",
+          "group": "vcast@10",
+          "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.reqs2xFeatureEnabled"
+        },
+        {
+          "command": "vectorcastTestExplorer.removeRequirements",
+          "group": "vcast@9",
+          "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.reqs2xFeatureEnabled && testId in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
+        },
+        {
+          "command": "vectorcastTestExplorer.populateRequirementsGateway",
+          "group": "vcast@9",
+          "when": "testId =~ /^vcast:.*$/ && vectorcastTestExplorer.reqs2xFeatureEnabled && testId in vectorcastTestExplorer.vcastRequirementsAvailable && vectorcastTestExplorer.generateRequirementsEnabled"
+        },
+        {
+          "command": "vectorcastTestExplorer.viewResults",
+          "group": "vcast.results",
+          "when": "testId =~ /^vcast:.*$/ && testId not in vectorcastTestExplorer.vcastEnviroList  && testId not in vectorcastTestExplorer.vcastUnbuiltEnviroList"
+        }
+      ]
     },
     "submenus": [
       {
@@ -1206,4 +1249,4 @@
   "engines": {
     "vscode": "^1.79.0"
   }
-}
\ No newline at end of file
+}
diff --git a/python/vcastDataServer.py b/python/vcastDataServer.py
index 21aaed54..ef887136 100644
--- a/python/vcastDataServer.py
+++ b/python/vcastDataServer.py
@@ -273,7 +273,10 @@ def main():
 
     # start the server
     logFilePath = os.path.join(os.getcwd(), "vcastDataServer.log")
-    with open(logFilePath, "w", buffering=1) as pythonUtilities.logFileHandle:
+    # ensure the log file uses utf-8 so we can write any unicode chars
+    with open(
+        logFilePath, "w", buffering=1, encoding="utf-8", errors="replace"
+    ) as pythonUtilities.logFileHandle:
         # this will set the vcastDataServerTypes.PORT global
         findAvailablePort()
         app = init_application(logFilePath)
diff --git a/src/extension.ts b/src/extension.ts
index 4762892f..08570943 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -3338,6 +3338,33 @@ function gatherLLMProviderSettings(): LLMProviderSettingsResult {
         baseEnv[key.trim()] = value.trim();
       }
     }
+  } else if (provider === "openai_at") {
+    // OpenAI Access Token based authentication (distinct from standard OpenAI apiKey usage)
+    need(
+      config.get<string>("reqs2x.openai_at.modelName"),
+      "OpenAI AT Model Name",
+      "VCAST_REQS2X_OPENAI_AT_MODEL_NAME"
+    );
+    need(
+      config.get<string>("reqs2x.openai_at.modelUrl"),
+      "OpenAI AT Base URL",
+      "VCAST_REQS2X_OPENAI_AT_MODEL_URL"
+    );
+    need(
+      config.get<string>("reqs2x.openai_at.authUrl"),
+      "OpenAI AT Auth URL",
+      "VCAST_REQS2X_OPENAI_AT_AUTH_URL"
+    );
+    need(
+      config.get<string>("reqs2x.openai_at.appKey"),
+      "OpenAI AT App Key",
+      "VCAST_REQS2X_OPENAI_AT_APP_KEY"
+    );
+    need(
+      config.get<string>("reqs2x.openai_at.appSecret"),
+      "OpenAI AT App Secret",
+      "VCAST_REQS2X_OPENAI_AT_APP_SECRET"
+    );
   } else {
     missing.push("Unsupported provider value");
   }