diff --git a/+llms/+internal/callAzureChatAPI.m b/+llms/+internal/callAzureChatAPI.m
index bb73053..c053b4a 100644
--- a/+llms/+internal/callAzureChatAPI.m
+++ b/+llms/+internal/callAzureChatAPI.m
@@ -64,7 +64,7 @@
 
 parameters = buildParametersCall(messages, functions, nvp);
 
-[response, streamedText] = llms.internal.sendRequest(parameters,nvp.APIKey, URL, nvp.TimeOut, nvp.StreamFun);
+[response, streamedText] = llms.internal.sendRequestWrapper(parameters,nvp.APIKey, URL, nvp.TimeOut, nvp.StreamFun);
 
 % If call errors, "choices" will not be part of response.Body.Data, instead
 % we get response.Body.Data.error
diff --git a/+llms/+internal/callOllamaChatAPI.m b/+llms/+internal/callOllamaChatAPI.m
index 4596231..0bad15f 100644
--- a/+llms/+internal/callOllamaChatAPI.m
+++ b/+llms/+internal/callOllamaChatAPI.m
@@ -53,7 +53,7 @@
 
 parameters = buildParametersCall(model, messages, nvp);
 
-[response, streamedText] = llms.internal.sendRequest(parameters,[],URL,nvp.TimeOut,nvp.StreamFun);
+[response, streamedText] = llms.internal.sendRequestWrapper(parameters,[],URL,nvp.TimeOut,nvp.StreamFun);
 
 % If call errors, "choices" will not be part of response.Body.Data, instead
 % we get response.Body.Data.error
diff --git a/+llms/+internal/callOpenAIChatAPI.m b/+llms/+internal/callOpenAIChatAPI.m
index 8d58fd4..742ce50 100644
--- a/+llms/+internal/callOpenAIChatAPI.m
+++ b/+llms/+internal/callOpenAIChatAPI.m
@@ -62,7 +62,7 @@
 
 parameters = buildParametersCall(messages, functions, nvp);
 
-[response, streamedText] = llms.internal.sendRequest(parameters,nvp.APIKey, END_POINT, nvp.TimeOut, nvp.StreamFun);
+[response, streamedText] = llms.internal.sendRequestWrapper(parameters,nvp.APIKey, END_POINT, nvp.TimeOut, nvp.StreamFun);
 
 % If call errors, "choices" will not be part of response.Body.Data, instead
 % we get response.Body.Data.error
diff --git a/+llms/+internal/sendRequestWrapper.m b/+llms/+internal/sendRequestWrapper.m
new file mode 100644
index 0000000..18160ce
--- /dev/null
+++ b/+llms/+internal/sendRequestWrapper.m
@@ -0,0 +1,5 @@
+function [response, streamedText] = sendRequestWrapper(varargin)
+% This function is undocumented and will change in a future release
+
+% A wrapper around sendRequest to have a test seam
+[response, streamedText] = llms.internal.sendRequest(varargin{:});
diff --git a/+llms/+internal/textGenerator.m b/+llms/+internal/textGenerator.m
index f6cb167..204e516 100644
--- a/+llms/+internal/textGenerator.m
+++ b/+llms/+internal/textGenerator.m
@@ -28,4 +28,10 @@
     properties (Access=protected)
         StreamFun
     end
+
+    methods
+        function hObj = set.StopSequences(hObj,value)
+            hObj.StopSequences = string(value);
+        end
+    end
 end
diff --git a/+llms/+stream/responseStreamer.m b/+llms/+stream/responseStreamer.m
index b13048d..d3b60b1 100644
--- a/+llms/+stream/responseStreamer.m
+++ b/+llms/+stream/responseStreamer.m
@@ -84,7 +84,8 @@
                                 end
                                 this.StreamFun('');
                                 this.ResponseText = txt;
-                            else
+                            elseif isfield(json.choices,"delta") && ...
+                                    isfield(json.choices.delta,"content")
                                 txt = json.choices.delta.content;
                                 this.StreamFun(txt);
                                 this.ResponseText = [this.ResponseText txt];
diff --git a/+llms/+utils/mustBeValidStop.m b/+llms/+utils/mustBeValidStop.m
index f3862c7..7301a2c 100644
--- a/+llms/+utils/mustBeValidStop.m
+++ b/+llms/+utils/mustBeValidStop.m
@@ -5,6 +5,7 @@ function mustBeValidStop(value)
     if ~isempty(value)
         mustBeVector(value);
         mustBeNonzeroLengthText(value);
+        value = string(value);
         % This restriction is set by the OpenAI API
         if numel(value)>4
             error("llms:stopSequencesMustHaveMax4Elements", llms.utils.errorMessageCatalog.getMessage("llms:stopSequencesMustHaveMax4Elements"));
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..cf5aa55
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,4 @@
+# Code owners, to get auto-filled reviewer lists
+
+# To start with, we just assume everyone in the core team is included on all reviews
+* @adulai @ccreutzi @debymf @MiriamScharnke @vpapanasta
\ No newline at end of file
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d7babcc..6be9f48 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,7 +30,7 @@ jobs:
       - name: Pull models
         run: |
             ollama pull mistral
-            ollama pull bakllava
+            ollama pull moondream
             OLLAMA_HOST=127.0.0.1:11435 ollama pull qwen2:0.5b
       - name: Set up MATLAB
         uses: matlab-actions/setup-matlab@v2
diff --git a/.gitignore b/.gitignore
index 4886537..510c487 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 *.env
 *.asv
 *.mat
+!tests/recordings/*.mat
 startup.m
 papers_to_read.csv
 data/*
diff --git a/extractOpenAIEmbeddings.m b/extractOpenAIEmbeddings.m
index 6813e0a..3f6b1a9 100644
--- a/extractOpenAIEmbeddings.m
+++ b/extractOpenAIEmbeddings.m
@@ -47,7 +47,7 @@
 end
 
 
-response = llms.internal.sendRequest(parameters,key, END_POINT, nvp.TimeOut);
+response = llms.internal.sendRequestWrapper(parameters,key, END_POINT, nvp.TimeOut);
 
 if isfield(response.Body.Data, "data")
     emb = [response.Body.Data.data.embedding];
diff --git a/tests/private/recording-doubles/+llms/+internal/sendRequestWrapper.m b/tests/private/recording-doubles/+llms/+internal/sendRequestWrapper.m
new file mode 100644
index 0000000..ab4858c
--- /dev/null
+++ b/tests/private/recording-doubles/+llms/+internal/sendRequestWrapper.m
@@ -0,0 +1,40 @@
+function [response, streamedText] = sendRequestWrapper(parameters, token, varargin)
+% This function is undocumented and will change in a future release
+
+% A wrapper around sendRequest to have a test seam
+persistent seenCalls
+if isempty(seenCalls)
+    seenCalls = cell(0,2);
+end
+
+persistent filename
+
+if nargin == 1 && isequal(parameters,"close")
+    save(filename+".mat","seenCalls");
+    seenCalls = cell(0,2);
+    return
+end
+
+if nargin==2 && isequal(parameters,"open")
+    filename = token;
+    return
+end
+
+streamFunCalls = {};
+hasCallback = nargin >= 5 && isa(varargin{3},'function_handle');
+if hasCallback
+    streamFun = varargin{3};
+end
+function wrappedStreamFun(varargin)
+    streamFunCalls(end+1) = varargin;
+    streamFun(varargin{:});
+end
+if hasCallback
+    varargin{3} = @wrappedStreamFun;
+end
+
+
+[response, streamedText] = llms.internal.sendRequest(parameters, token, varargin{:});
+
+seenCalls(end+1,:) = {{parameters},{response,streamFunCalls,streamedText}};
+end
diff --git a/tests/private/recording-doubles/addpath.m b/tests/private/recording-doubles/addpath.m
new file mode 100644
index 0000000..d1f1059
--- /dev/null
+++ b/tests/private/recording-doubles/addpath.m
@@ -0,0 +1,2 @@
+function addpath(~)
+% ignore addpath calls in examples
diff --git a/tests/private/replaying-doubles/+llms/+internal/sendRequestWrapper.m b/tests/private/replaying-doubles/+llms/+internal/sendRequestWrapper.m
new file mode 100644
index 0000000..0b689d7
--- /dev/null
+++ b/tests/private/replaying-doubles/+llms/+internal/sendRequestWrapper.m
@@ -0,0 +1,30 @@
+function [response, streamedText] = sendRequestWrapper(parameters, token, varargin)
+% This function is undocumented and will change in a future release
+
+% A wrapper around sendRequest to have a test seam
+persistent seenCalls
+if isempty(seenCalls)
+    seenCalls = cell(0,2);
+end
+
+if nargin == 1 && isequal(parameters,"close")
+    seenCalls = cell(0,2);
+    return
+end
+
+if nargin==2 && isequal(parameters,"open")
+    load(token+".mat","seenCalls");
+    return
+end
+
+result = seenCalls{1,2};
+response = result{1};
+streamFunCalls = result{2};
+streamedText = result{3};
+
+if nargin >= 5 && isa(varargin{3},'function_handle')
+    streamFun = varargin{3};
+    cellfun(streamFun, streamFunCalls);
+end
+
+seenCalls(1,:) = [];
diff --git a/tests/private/replaying-doubles/addpath.m b/tests/private/replaying-doubles/addpath.m
new file mode 100644
index 0000000..d1f1059
--- /dev/null
+++ b/tests/private/replaying-doubles/addpath.m
@@ -0,0 +1,2 @@
+function addpath(~)
+% ignore addpath calls in examples
diff --git a/tests/recordings/AnalyzeScientificPapersUsingFunctionCalls.mat b/tests/recordings/AnalyzeScientificPapersUsingFunctionCalls.mat
new file mode 100644
index 0000000..db2a334
Binary files /dev/null and b/tests/recordings/AnalyzeScientificPapersUsingFunctionCalls.mat differ
diff --git a/tests/recordings/AnalyzeSentimentinTextUsingChatGPTinJSONMode.mat b/tests/recordings/AnalyzeSentimentinTextUsingChatGPTinJSONMode.mat
new file mode 100644
index 0000000..310d0e8
Binary files /dev/null and b/tests/recordings/AnalyzeSentimentinTextUsingChatGPTinJSONMode.mat differ
diff --git a/tests/recordings/AnalyzeTextDataUsingParallelFunctionCallwithChatGPT.mat b/tests/recordings/AnalyzeTextDataUsingParallelFunctionCallwithChatGPT.mat
new file mode 100644
index 0000000..c51cde7
Binary files /dev/null and b/tests/recordings/AnalyzeTextDataUsingParallelFunctionCallwithChatGPT.mat differ
diff --git a/tests/recordings/CreateSimpleChatBot.mat b/tests/recordings/CreateSimpleChatBot.mat
new file mode 100644
index 0000000..857ff8b
Binary files /dev/null and b/tests/recordings/CreateSimpleChatBot.mat differ
diff --git a/tests/recordings/CreateSimpleOllamaChatBot.mat b/tests/recordings/CreateSimpleOllamaChatBot.mat
new file mode 100644
index 0000000..eadaa28
Binary files /dev/null and b/tests/recordings/CreateSimpleOllamaChatBot.mat differ
diff --git a/tests/recordings/DescribeImagesUsingChatGPT.mat b/tests/recordings/DescribeImagesUsingChatGPT.mat
new file mode 100644
index 0000000..227da1b
Binary files /dev/null and b/tests/recordings/DescribeImagesUsingChatGPT.mat differ
diff --git a/tests/recordings/InformationRetrievalUsingOpenAIDocumentEmbedding.mat b/tests/recordings/InformationRetrievalUsingOpenAIDocumentEmbedding.mat
new file mode 100644
index 0000000..d82f627
Binary files /dev/null and b/tests/recordings/InformationRetrievalUsingOpenAIDocumentEmbedding.mat differ
diff --git a/tests/recordings/ProcessGeneratedTextInRealTimeByUsingOllamaInStreamingMode.mat b/tests/recordings/ProcessGeneratedTextInRealTimeByUsingOllamaInStreamingMode.mat
new file mode 100644
index 0000000..5bdf6d7
Binary files /dev/null and b/tests/recordings/ProcessGeneratedTextInRealTimeByUsingOllamaInStreamingMode.mat differ
diff --git a/tests/recordings/ProcessGeneratedTextinRealTimebyUsingChatGPTinStreamingMode.mat b/tests/recordings/ProcessGeneratedTextinRealTimebyUsingChatGPTinStreamingMode.mat
new file mode 100644
index 0000000..cf73f21
Binary files /dev/null and b/tests/recordings/ProcessGeneratedTextinRealTimebyUsingChatGPTinStreamingMode.mat differ
diff --git a/tests/recordings/README.md b/tests/recordings/README.md
new file mode 100644
index 0000000..010208d
--- /dev/null
+++ b/tests/recordings/README.md
@@ -0,0 +1,12 @@
+# Test Double Recordings
+
+Testing the examples typically takes a long time and tends to have false negatives relatively often, mostly due to timeout errors.
+
+The point of testing the examples is not to test that we can connect to the servers. We have other test points for that. Hence, we insert a “test double” while testing the examples that keeps recordings of previous interactions with the servers and just replays the responses.
+
+This directory contains those recordings.
+
+## Generating Recordings
+
+To generate or re-generate recordings (e.g., after changing an example, or making relevant software changes), open [`texampleTests.m`](../texampleTests.m) and in `setUpAndTearDowns`, change `capture = false;` to `capture = true;`. Then, run the test points relevant to the example(s) in question, and change `capture` back to `false`.
+
diff --git a/tests/recordings/RetrievalAugmentedGenerationUsingChatGPTandMATLAB.mat b/tests/recordings/RetrievalAugmentedGenerationUsingChatGPTandMATLAB.mat
new file mode 100644
index 0000000..6bd5878
Binary files /dev/null and b/tests/recordings/RetrievalAugmentedGenerationUsingChatGPTandMATLAB.mat differ
diff --git a/tests/recordings/RetrievalAugmentedGenerationUsingOllamaAndMATLAB.mat b/tests/recordings/RetrievalAugmentedGenerationUsingOllamaAndMATLAB.mat
new file mode 100644
index 0000000..8329b23
Binary files /dev/null and b/tests/recordings/RetrievalAugmentedGenerationUsingOllamaAndMATLAB.mat differ
diff --git a/tests/recordings/SummarizeLargeDocumentsUsingChatGPTandMATLAB.mat b/tests/recordings/SummarizeLargeDocumentsUsingChatGPTandMATLAB.mat
new file mode 100644
index 0000000..f44077b
Binary files /dev/null and b/tests/recordings/SummarizeLargeDocumentsUsingChatGPTandMATLAB.mat differ
diff --git a/tests/recordings/UsingDALLEToEditImages.mat b/tests/recordings/UsingDALLEToEditImages.mat
new file mode 100644
index 0000000..f20b183
Binary files /dev/null and b/tests/recordings/UsingDALLEToEditImages.mat differ
diff --git a/tests/recordings/UsingDALLEToGenerateImages.mat b/tests/recordings/UsingDALLEToGenerateImages.mat
new file mode 100644
index 0000000..58b842b
Binary files /dev/null and b/tests/recordings/UsingDALLEToGenerateImages.mat differ
diff --git a/tests/texampleTests.m b/tests/texampleTests.m
index ea5955b..e08a5c9 100644
--- a/tests/texampleTests.m
+++ b/tests/texampleTests.m
@@ -8,9 +8,25 @@
         ChatBotExample = {"CreateSimpleChatBot", "CreateSimpleOllamaChatBot"};
     end
 
+    properties
+        TestDir;
+    end
 
     methods (TestClassSetup)
         function setUpAndTearDowns(testCase)
+            % Capture and replay server interactions
+            testCase.TestDir = fileparts(mfilename("fullpath"));
+            import matlab.unittest.fixtures.PathFixture
+            capture = false; % run in capture or replay mode, cf. recordings/README.md
+
+            if capture
+                testCase.applyFixture(PathFixture( ...
+                    fullfile(testCase.TestDir,"private","recording-doubles")));
+            else
+                testCase.applyFixture(PathFixture( ...
+                    fullfile(testCase.TestDir,"private","replaying-doubles")));
+            end
+
             import matlab.unittest.fixtures.CurrentFolderFixture
             testCase.applyFixture(CurrentFolderFixture("../examples/mlx-scripts"));
 
@@ -29,22 +45,39 @@ function setUpAndTearDowns(testCase)
             testCase.addTeardown(@() iCloseAll());
         end
     end
-    
+
+    methods
+        function startCapture(testCase,testName)
+            llms.internal.sendRequestWrapper("open", ...
+                fullfile(testCase.TestDir,"recordings",testName));
+        end
+    end
+
+    methods(TestMethodTeardown)
+        function closeCapture(~)
+            llms.internal.sendRequestWrapper("close");
+        end
+    end
+
     methods(Test)
-        function testAnalyzeScientificPapersUsingFunctionCalls(~)
+        function testAnalyzeScientificPapersUsingFunctionCalls(testCase)
+            testCase.startCapture("AnalyzeScientificPapersUsingFunctionCalls");
             AnalyzeScientificPapersUsingFunctionCalls;
         end
 
         function testAnalyzeSentimentinTextUsingChatGPTinJSONMode(testCase)
+            testCase.startCapture("AnalyzeSentimentinTextUsingChatGPTinJSONMode");
             testCase.verifyWarning(@AnalyzeSentimentinTextUsingChatGPTinJSONMode,...
                 "llms:warningJsonInstruction");
         end
 
-        function testAnalyzeTextDataUsingParallelFunctionCallwithChatGPT(~)
+        function testAnalyzeTextDataUsingParallelFunctionCallwithChatGPT(testCase)
+            testCase.startCapture("AnalyzeTextDataUsingParallelFunctionCallwithChatGPT");
             AnalyzeTextDataUsingParallelFunctionCallwithChatGPT;
         end
 
         function testCreateSimpleChatBot(testCase,ChatBotExample)
+            testCase.startCapture(ChatBotExample);
             % set up a fake input command, returning canned user prompts
             count = 0;
             prompts = [
@@ -85,43 +118,51 @@ function testCreateSimpleChatBot(testCase,ChatBotExample)
             testCase.verifySize(messages.Messages,[1 2*(count-1)]);
         end
 
-        function testDescribeImagesUsingChatGPT(~)
+        function testDescribeImagesUsingChatGPT(testCase)
+            testCase.startCapture("DescribeImagesUsingChatGPT");
             DescribeImagesUsingChatGPT;
         end
 
-        function testInformationRetrievalUsingOpenAIDocumentEmbedding(~)
+        function testInformationRetrievalUsingOpenAIDocumentEmbedding(testCase)
+            testCase.startCapture("InformationRetrievalUsingOpenAIDocumentEmbedding");
             InformationRetrievalUsingOpenAIDocumentEmbedding;
         end
 
-        function testProcessGeneratedTextinRealTimebyUsingChatGPTinStreamingMode(~)
+        function testProcessGeneratedTextinRealTimebyUsingChatGPTinStreamingMode(testCase)
+            testCase.startCapture("ProcessGeneratedTextinRealTimebyUsingChatGPTinStreamingMode");
             ProcessGeneratedTextinRealTimebyUsingChatGPTinStreamingMode;
         end
 
-        function testProcessGeneratedTextInRealTimeByUsingOllamaInStreamingMode(~)
+        function testProcessGeneratedTextInRealTimeByUsingOllamaInStreamingMode(testCase)
+            testCase.startCapture("ProcessGeneratedTextInRealTimeByUsingOllamaInStreamingMode");
             ProcessGeneratedTextInRealTimeByUsingOllamaInStreamingMode;
         end
 
-        function testRetrievalAugmentedGenerationUsingChatGPTandMATLAB(~)
+        function testRetrievalAugmentedGenerationUsingChatGPTandMATLAB(testCase)
+            testCase.startCapture("RetrievalAugmentedGenerationUsingChatGPTandMATLAB");
             RetrievalAugmentedGenerationUsingChatGPTandMATLAB;
         end
 
-        function testRetrievalAugmentedGenerationUsingOllamaAndMATLAB(~)
+        function testRetrievalAugmentedGenerationUsingOllamaAndMATLAB(testCase)
+            testCase.startCapture("RetrievalAugmentedGenerationUsingOllamaAndMATLAB");
             RetrievalAugmentedGenerationUsingOllamaAndMATLAB;
         end
 
-        function testSummarizeLargeDocumentsUsingChatGPTandMATLAB(~)
+        function testSummarizeLargeDocumentsUsingChatGPTandMATLAB(testCase)
+            testCase.startCapture("SummarizeLargeDocumentsUsingChatGPTandMATLAB");
             SummarizeLargeDocumentsUsingChatGPTandMATLAB;
         end
 
-        function testUsingDALLEToEditImages(~)
+        function testUsingDALLEToEditImages(testCase)
+            testCase.startCapture("UsingDALLEToEditImages");
             UsingDALLEToEditImages;
         end
 
-        function testUsingDALLEToGenerateImages(~)
+        function testUsingDALLEToGenerateImages(testCase)
+            testCase.startCapture("UsingDALLEToGenerateImages");
             UsingDALLEToGenerateImages;
         end
-    end
-    
+    end    
 end
 
 function iCloseAll()
diff --git a/tests/tollamaChat.m b/tests/tollamaChat.m
index 1040c4a..52d1376 100644
--- a/tests/tollamaChat.m
+++ b/tests/tollamaChat.m
@@ -99,7 +99,7 @@ function seedFixesResult(testCase)
         end
 
         function generateWithImages(testCase)
-            chat = ollamaChat("bakllava");
+            chat = ollamaChat("moondream");
             image_path = "peppers.png";
             emptyMessages = messageHistory;
             messages = addUserMessageWithImages(emptyMessages,"What is in the image?",image_path);
diff --git a/tests/topenAIChat.m b/tests/topenAIChat.m
index e06db55..ad3f69e 100644
--- a/tests/topenAIChat.m
+++ b/tests/topenAIChat.m
@@ -97,6 +97,14 @@ function invalidInputsConstructor(testCase, InvalidConstructorInput)
             testCase.verifyError(@()openAIChat(InvalidConstructorInput.Input{:}), InvalidConstructorInput.Error);
         end
 
+        function generateWithStreamFunAndMaxNumTokens(testCase)
+            sf = @(x) fprintf("%s",x);
+            chat = openAIChat(StreamFun=sf);
+            result = generate(chat,"Why is a raven like a writing desk?",MaxNumTokens=5);
+            testCase.verifyClass(result,"string");
+            testCase.verifyLessThan(strlength(result), 100);
+        end
+
         function generateWithToolsAndStreamFunc(testCase)
             import matlab.unittest.constraints.HasField
 
@@ -388,7 +396,6 @@ function keyNotFound(testCase)
 function validConstructorInput = iGetValidConstructorInput()
 % while it is valid to provide the key via an environment variable,
 % this test set does not use that, for easier setup
-validFunction = openAIFunction("funName");
 validConstructorInput = struct( ...
     "JustKey", struct( ...
         "Input",{{"APIKey","this-is-not-a-real-key"}}, ...
@@ -396,7 +403,7 @@ function keyNotFound(testCase)
         "VerifyProperties", struct( ...
                 "Temperature", {1}, ...
                 "TopP", {1}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0}, ...
                 "FrequencyPenalty", {0}, ...
                 "TimeOut", {10}, ...
@@ -412,7 +419,7 @@ function keyNotFound(testCase)
         "VerifyProperties", struct( ...
                 "Temperature", {1}, ...
                 "TopP", {1}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0}, ...
                 "FrequencyPenalty", {0}, ...
                 "TimeOut", {10}, ...
@@ -428,7 +435,7 @@ function keyNotFound(testCase)
         "VerifyProperties", struct( ...
                 "Temperature", {2}, ...
                 "TopP", {1}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0}, ...
                 "FrequencyPenalty", {0}, ...
                 "TimeOut", {10}, ...
@@ -444,7 +451,7 @@ function keyNotFound(testCase)
         "VerifyProperties", struct( ...
                 "Temperature", {1}, ...
                 "TopP", {0.2}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0}, ...
                 "FrequencyPenalty", {0}, ...
                 "TimeOut", {10}, ...
@@ -470,13 +477,29 @@ function keyNotFound(testCase)
                 "ResponseFormat", {"text"} ...
             ) ...
         ), ...
+    "StopSequencesCharVector", struct( ...
+        "Input",{{"APIKey","this-is-not-a-real-key","StopSequences",'supercalifragilistic'}}, ...
+        "ExpectedWarning", '', ...
+        "VerifyProperties", struct( ...
+                "Temperature", {1}, ...
+                "TopP", {1}, ...
+                "StopSequences", {"supercalifragilistic"}, ...
+                "PresencePenalty", {0}, ...
+                "FrequencyPenalty", {0}, ...
+                "TimeOut", {10}, ...
+                "FunctionNames", {[]}, ...
+                "ModelName", {"gpt-4o-mini"}, ...
+                "SystemPrompt", {[]}, ...
+                "ResponseFormat", {"text"} ...
+            ) ...
+        ), ...
     "PresencePenalty", struct( ...
         "Input",{{"APIKey","this-is-not-a-real-key","PresencePenalty",0.1}}, ...
         "ExpectedWarning", '', ...
         "VerifyProperties", struct( ...
                 "Temperature", {1}, ...
                 "TopP", {1}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0.1}, ...
                 "FrequencyPenalty", {0}, ...
                 "TimeOut", {10}, ...
@@ -492,7 +515,7 @@ function keyNotFound(testCase)
         "VerifyProperties", struct( ...
                 "Temperature", {1}, ...
                 "TopP", {1}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0}, ...
                 "FrequencyPenalty", {0.1}, ...
                 "TimeOut", {10}, ...
@@ -508,7 +531,7 @@ function keyNotFound(testCase)
         "VerifyProperties", struct( ...
                 "Temperature", {1}, ...
                 "TopP", {1}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0}, ...
                 "FrequencyPenalty", {0}, ...
                 "TimeOut", {0.1}, ...
@@ -524,7 +547,7 @@ function keyNotFound(testCase)
         "VerifyProperties", struct( ...
                 "Temperature", {1}, ...
                 "TopP", {1}, ...
-                "StopSequences", {{}}, ...
+                "StopSequences", {string([])}, ...
                 "PresencePenalty", {0}, ...
                 "FrequencyPenalty", {0}, ...
                 "TimeOut", {10}, ...