diff --git a/dev-packages/node-integration-tests/suites/aws-serverless/bedrock/test.ts b/dev-packages/node-integration-tests/suites/aws-serverless/bedrock/test.ts
index 018326729159..de0d7878c826 100644
--- a/dev-packages/node-integration-tests/suites/aws-serverless/bedrock/test.ts
+++ b/dev-packages/node-integration-tests/suites/aws-serverless/bedrock/test.ts
@@ -34,7 +34,7 @@ function assertBedrockSpans(container: SerializedStreamedSpanContainer): void {
   expect(converseSpan!.attributes[GEN_AI_REQUEST_TOP_P].value).toBe(0.9);
   expect(converseSpan!.attributes[GEN_AI_USAGE_INPUT_TOKENS].value).toBe(12);
   expect(converseSpan!.attributes[GEN_AI_USAGE_OUTPUT_TOKENS].value).toBe(8);
-  expect(converseSpan!.attributes[GEN_AI_RESPONSE_FINISH_REASONS].value).toEqual(['end_turn']);
+  expect(converseSpan!.attributes[GEN_AI_RESPONSE_FINISH_REASONS].value).toBe('["end_turn"]');
 
   // InvokeModel (non-streaming, anthropic.claude request/response body)
   const invokeModelSpan = container.items.find(span => span.name === `generate_content ${MODEL_ID}`);
@@ -49,7 +49,7 @@ function assertBedrockSpans(container: SerializedStreamedSpanContainer): void {
   expect(invokeModelSpan!.attributes[GEN_AI_REQUEST_TOP_P].value).toBe(0.9);
   expect(invokeModelSpan!.attributes[GEN_AI_USAGE_INPUT_TOKENS].value).toBe(15);
   expect(invokeModelSpan!.attributes[GEN_AI_USAGE_OUTPUT_TOKENS].value).toBe(9);
-  expect(invokeModelSpan!.attributes[GEN_AI_RESPONSE_FINISH_REASONS].value).toEqual(['end_turn']);
+  expect(invokeModelSpan!.attributes[GEN_AI_RESPONSE_FINISH_REASONS].value).toBe('["end_turn"]');
 }
 
 describe('awsIntegration - Bedrock', () => {
diff --git a/packages/server-utils/src/integrations/aws-sdk/services/bedrock-runtime.ts b/packages/server-utils/src/integrations/aws-sdk/services/bedrock-runtime.ts
index 97854b017c8c..c7ba139f9f48 100644
--- a/packages/server-utils/src/integrations/aws-sdk/services/bedrock-runtime.ts
+++ b/packages/server-utils/src/integrations/aws-sdk/services/bedrock-runtime.ts
@@ -296,7 +296,7 @@ export class BedrockRuntimeServiceExtension implements ServiceExtension {
           span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, responseBody.results[0].tokenCount);
         }
         if (responseBody.results?.[0]?.completionReason !== undefined) {
-          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [responseBody.results[0].completionReason]);
+          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([responseBody.results[0].completionReason]));
         }
       } else if (currentModelId.includes('amazon.nova')) {
         if (responseBody.usage !== undefined) {
@@ -308,7 +308,7 @@ export class BedrockRuntimeServiceExtension implements ServiceExtension {
           }
         }
         if (responseBody.stopReason !== undefined) {
-          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [responseBody.stopReason]);
+          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([responseBody.stopReason]));
         }
       } else if (currentModelId.includes('anthropic.claude')) {
         const usage = responseBody.usage;
@@ -324,7 +324,7 @@ export class BedrockRuntimeServiceExtension implements ServiceExtension {
           ),
         );
         if (responseBody.stop_reason !== undefined) {
-          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [responseBody.stop_reason]);
+          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([responseBody.stop_reason]));
         }
       } else if (currentModelId.includes('meta.llama')) {
         if (responseBody.prompt_token_count !== undefined) {
@@ -334,28 +334,31 @@ export class BedrockRuntimeServiceExtension implements ServiceExtension {
           span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, responseBody.generation_token_count);
         }
         if (responseBody.stop_reason !== undefined) {
-          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [responseBody.stop_reason]);
+          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([responseBody.stop_reason]));
         }
       } else if (currentModelId.includes('cohere.command-r')) {
         if (responseBody.text !== undefined) {
           span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, Math.ceil(responseBody.text.length / 6));
         }
         if (responseBody.finish_reason !== undefined) {
-          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [responseBody.finish_reason]);
+          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([responseBody.finish_reason]));
         }
       } else if (currentModelId.includes('cohere.command')) {
         if (responseBody.generations?.[0]?.text !== undefined) {
           span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, Math.ceil(responseBody.generations[0].text.length / 6));
         }
         if (responseBody.generations?.[0]?.finish_reason !== undefined) {
-          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [responseBody.generations[0].finish_reason]);
+          span.setAttribute(
+            GEN_AI_RESPONSE_FINISH_REASONS,
+            JSON.stringify([responseBody.generations[0].finish_reason]),
+          );
         }
       } else if (currentModelId.includes('mistral')) {
         if (responseBody.outputs?.[0]?.text !== undefined) {
           span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, Math.ceil(responseBody.outputs[0].text.length / 6));
         }
         if (responseBody.outputs?.[0]?.stop_reason !== undefined) {
-          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [responseBody.outputs[0].stop_reason]);
+          span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([responseBody.outputs[0].stop_reason]));
         }
       }
     }
@@ -445,7 +448,7 @@ function setStreamErrorStatus(span: Span, abortSignal: AbortSignal | undefined):
 
 function setStopReason(span: Span, stopReason: string | undefined): void {
   if (stopReason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [stopReason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([stopReason]));
   }
 }
 
@@ -503,7 +506,7 @@ function recordNovaAttributes(parsedChunk: ParsedChunk, span: Span): void {
     }
   }
   if (parsedChunk.messageStop?.stopReason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [parsedChunk.messageStop.stopReason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([parsedChunk.messageStop.stopReason]));
   }
 }
 
@@ -514,7 +517,7 @@ function recordClaudeAttributes(parsedChunk: ParsedChunk, span: Span): void {
     span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, parsedChunk.usage.output_tokens);
   }
   if (parsedChunk.delta?.stop_reason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [parsedChunk.delta.stop_reason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([parsedChunk.delta.stop_reason]));
   }
 }
 
@@ -526,7 +529,7 @@ function recordTitanAttributes(parsedChunk: ParsedChunk, span: Span): void {
     span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, parsedChunk.totalOutputTextTokenCount);
   }
   if (parsedChunk.completionReason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [parsedChunk.completionReason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([parsedChunk.completionReason]));
   }
 }
 
@@ -538,7 +541,7 @@ function recordLlamaAttributes(parsedChunk: ParsedChunk, span: Span): void {
     span.setAttribute(GEN_AI_USAGE_OUTPUT_TOKENS, parsedChunk.generation_token_count);
   }
   if (parsedChunk.stop_reason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [parsedChunk.stop_reason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([parsedChunk.stop_reason]));
   }
 }
 
@@ -559,20 +562,20 @@ function recordInvocationMetrics(parsedChunk: ParsedChunk, span: Span): void {
 function recordMistralAttributes(parsedChunk: ParsedChunk, span: Span): void {
   recordInvocationMetrics(parsedChunk, span);
   if (parsedChunk.outputs?.[0]?.stop_reason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [parsedChunk.outputs[0].stop_reason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([parsedChunk.outputs[0].stop_reason]));
   }
 }
 
 function recordCohereAttributes(parsedChunk: ParsedChunk, span: Span): void {
   recordInvocationMetrics(parsedChunk, span);
   if (parsedChunk.generations?.[0]?.finish_reason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [parsedChunk.generations[0].finish_reason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([parsedChunk.generations[0].finish_reason]));
   }
 }
 
 function recordCohereRAttributes(parsedChunk: ParsedChunk, span: Span): void {
   recordInvocationMetrics(parsedChunk, span);
   if (parsedChunk.finish_reason !== undefined) {
-    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, [parsedChunk.finish_reason]);
+    span.setAttribute(GEN_AI_RESPONSE_FINISH_REASONS, JSON.stringify([parsedChunk.finish_reason]));
   }
 }