@@ -492,7 +492,7 @@ describe('Vercel AI integration (v4)', () => {
   });
 
   createEsmAndCjsTests(__dirname, 'scenario-conversation-id.mjs', 'instrument.mjs', (createRunner, test) => {
-    test('does not overwrite conversation id set via Sentry.setConversationId with responseId from provider metadata', async () => {
+    test('keeps the conversation id set via Sentry.setConversationId and ignores the provider responseId', async () => {
       await createRunner()
         .expect({ transaction: { transaction: 'main' } })
         .expect({
 
@@ -0,0 +1,75 @@
+import * as Sentry from '@sentry/node';
+import { generateText, tool } from 'ai';
+import { MockLanguageModelV3 } from 'ai/test';
+import { z } from 'zod';
+
+const usage = {
+  inputTokens: { total: 10, noCache: 10, cached: 0 },
+  outputTokens: { total: 5, noCache: 5, cached: 0 },
+  totalTokens: { total: 15, noCache: 15, cached: 0 },
+};
+
+const textModel = new MockLanguageModelV3({
+  doGenerate: async () => ({
+    finishReason: { unified: 'stop', raw: 'stop' },
+    usage,
+    content: [{ type: 'text', text: 'Hello!' }],
+    warnings: [],
+    // A per-response id: present on every turn, never the conversation id.
+    providerMetadata: { openai: { responseId: 'resp_turn' } },
+  }),
+});
+
+const toolCallModel = new MockLanguageModelV3({
+  doGenerate: async () => ({
+    finishReason: { unified: 'tool-calls', raw: 'tool_calls' },
+    usage,
+    content: [{ type: 'tool-call', toolCallId: 'tc-1', toolName: 'echo', input: JSON.stringify({ text: 'hi' }) }],
+    warnings: [],
+  }),
+});
+
+async function run() {
+  await Sentry.startSpan({ op: 'function', name: 'main' }, async () => {
+    // A turn of an OpenAI Conversations API conversation.
+    await generateText({
+      experimental_telemetry: { isEnabled: true },
+      model: textModel,
+      prompt: 'First turn',
+      providerOptions: { openai: { conversation: 'conv_abc123' } },
+    });
+
+    // The Azure Responses API carries the same option under the `azure` key; this turn also runs a tool.
+    await generateText({
+      experimental_telemetry: { isEnabled: true },
+      model: toolCallModel,
+      prompt: 'Second turn',
+      providerOptions: { azure: { conversation: 'conv_azure' } },
+      tools: {
+        echo: tool({
+          inputSchema: z.object({ text: z.string() }),
+          execute: async ({ text }) => text,
+        }),
+      },
+    });
+
+    // Chaining on the previous response names a response, not a thread, so no conversation id.
+    await generateText({
+      experimental_telemetry: { isEnabled: true },
+      model: textModel,
+      prompt: 'Chained turn',
+      providerOptions: { openai: { previousResponseId: 'resp_turn' } },
+    });
+
+    // An id set through the SDK API wins over the provider option. Last, since it stays on the scope.
+    Sentry.setConversationId('conv-from-api');
+    await generateText({
+      experimental_telemetry: { isEnabled: true },
+      model: textModel,
+      prompt: 'API turn',
+      providerOptions: { openai: { conversation: 'conv_ignored' } },
+    });
+  });
+}
+
+run();
@@ -767,7 +767,7 @@ describe.each(matrix)('Vercel AI integration (version %s)', (version, vercelAiVe
     'scenario-provider-metadata.mjs',
     'instrument.mjs',
     (createRunner, test) => {
-      test('derives provider-metadata token breakdown, conversation id and system instructions', async () => {
+      test('derives provider-metadata token breakdown and system instructions', async () => {
         await createRunner()
           .expect({ transaction: { transaction: 'main' } })
           .expect({
@@ -781,12 +781,13 @@ describe.each(matrix)('Vercel AI integration (version %s)', (version, vercelAiVe
               )!;
               expect(generateContent).toBeDefined();
 
-              // Cache/reasoning token breakdown and conversation id are derived from the model's
-              // `providerMetadata` — by the OTel processor on v6 and by the channel subscriber on v7,
-              // both via the shared `getProviderMetadataAttributes` helper, so the shape is identical.
+              // Cache/reasoning token breakdown is derived from the model's `providerMetadata` by the
+              // channel subscriber, which v6 reaches through the orchestrion adapter, so the shape is the
+              // same on both versions.
               expect(generateContent.attributes[GEN_AI_USAGE_CACHE_READ_INPUT_TOKENS]?.value).toBe(5);
               expect(generateContent.attributes[GEN_AI_USAGE_REASONING_OUTPUT_TOKENS]?.value).toBe(7);
-              expect(generateContent.attributes[GEN_AI_CONVERSATION_ID]?.value).toBe('resp_abc123');
+              // The per-response `responseId` is not a conversation id and must not be recorded as one.
+              expect(generateContent.attributes[GEN_AI_CONVERSATION_ID]).toBeUndefined();
 
               const invokeAgent = container.items.find(
                 span => span.attributes['sentry.op']?.value === 'gen_ai.invoke_agent',
@@ -813,6 +814,66 @@ describe.each(matrix)('Vercel AI integration (version %s)', (version, vercelAiVe
     },
   );
 
+  createEsmTests(
+    __dirname,
+    'scenario-openai-conversation.mjs',
+    'instrument.mjs',
+    (createRunner, test) => {
+      test('derives gen_ai.conversation.id from the OpenAI `conversation` provider option', async () => {
+        await createRunner()
+          .expect({ transaction: { transaction: 'main' } })
+          .expect({
+            span: container => {
+              const genAiSpans = container.items.filter(s =>
+                String(s.attributes['sentry.op']?.value ?? '').startsWith('gen_ai.'),
+              );
+              const conversationIdOf = (span: (typeof genAiSpans)[number]) =>
+                span.attributes[GEN_AI_CONVERSATION_ID]?.value;
+              const invokeAgentSpans = genAiSpans.filter(
+                s => s.attributes['sentry.op']?.value === 'gen_ai.invoke_agent',
+              );
+              expect(invokeAgentSpans).toHaveLength(4);
+              const [firstTurn, secondTurn, chainedTurn, apiTurn] = invokeAgentSpans.sort(
+                (a, b) => a.start_timestamp - b.start_timestamp,
+              );
+
+              // `providerOptions.openai.conversation` is the Conversations API id: the same on every turn.
+              expect(conversationIdOf(firstTurn!)).toBe('conv_abc123');
+              // The Azure Responses API uses the `azure` key for the same option.
+              expect(conversationIdOf(secondTurn!)).toBe('conv_azure');
+              // `previousResponseId` names a response rather than a thread, and the response's own
+              // `responseId` is recorded as `gen_ai.response.id` only.
+              expect(conversationIdOf(chainedTurn!)).toBeUndefined();
+              // `Sentry.setConversationId()` beats the provider option.
+              expect(conversationIdOf(apiTurn!)).toBe('conv-from-api');
+
+              // Model-call and tool spans carry their operation's id, even though their start events
+              // do not carry `providerOptions`.
+              const modelCallSpans = genAiSpans.filter(
+                s => s.attributes['sentry.op']?.value === 'gen_ai.generate_content',
+              );
+              expect(modelCallSpans.map(conversationIdOf).sort()).toEqual([
+                'conv-from-api',
+                'conv_abc123',
+                'conv_azure',
+                undefined,
+              ]);
+              const toolSpan = genAiSpans.find(s => s.attributes['sentry.op']?.value === 'gen_ai.execute_tool')!;
+              expect(toolSpan).toBeDefined();
+              expect(conversationIdOf(toolSpan)).toBe('conv_azure');
+            },
+          })
+          .start()
+          .completed();
+      });
+    },
+    {
+      additionalDependencies: {
+        ai: vercelAiVersion,
+      },
+    },
+  );
+
   createEsmTests(
     __dirname,
     'scenario-cache-tokens.mjs',
 
@@ -1,6 +1,5 @@
 import type { SpanAttributeValue } from '@sentry/core';
 import {
-  GEN_AI_CONVERSATION_ID,
   GEN_AI_USAGE_CACHE_CREATION_INPUT_TOKENS,
   GEN_AI_USAGE_CACHE_READ_INPUT_TOKENS,
   GEN_AI_USAGE_OUTPUT_TOKENS,
@@ -10,8 +9,8 @@ import {
 import type { OpenAiProviderMetadata, ProviderMetadata } from './vercel-ai-attributes';
 
 /**
- * Derive the `gen_ai.usage.*` cache/reasoning/prediction token attributes and `gen_ai.conversation.id`
- * from an AI SDK `providerMetadata` object.
+ * Derive the `gen_ai.usage.*` cache/reasoning/prediction token attributes from an AI SDK
+ * `providerMetadata` object.
  *
  * Used by the `ai` >= 7 tracing-channel subscriber, which receives `providerMetadata` as an object on
  * the channel result. Pass the already-parsed object; unknown/empty input yields `{}`.
@@ -39,7 +38,6 @@ export function getProviderMetadataAttributes(providerMetadata: unknown): Record
       'gen_ai.usage.output_tokens.prediction_rejected',
       openaiMetadata.rejectedPredictionTokens,
     );
-    setAttributeIfDefined(attributes, GEN_AI_CONVERSATION_ID, openaiMetadata.responseId);
   }
 
   if (metadata.anthropic) {
 
@@ -39,6 +39,7 @@ import type { Span, SpanAttributes } from '@sentry/core';
 import {
   _INTERNAL_skipAiProviderWrapping,
   captureException,
+  getActiveSpan,
   getClient,
   isObjectLike,
   SPAN_STATUS_ERROR,
@@ -141,6 +142,31 @@ export function clearOperationCallId(callId: string): void {
   invokeAgentSpanByCallId.delete(callId);
 }
 
+/**
+ * The OpenAI Conversations API id from `providerOptions.openai.conversation` (or `azure`): the one
+ * provider-level value that is the same on every turn. A `Sentry.setConversationId()` value still wins,
+ * since `conversationIdIntegration` writes it on `spanStart`, after these start attributes.
+ */
+function getOpenAiConversationId(providerOptions: unknown): string | undefined {
+  if (!isObjectLike(providerOptions)) {
+    return undefined;
+  }
+  for (const key of ['openai', 'azure']) {
+    const options = providerOptions[key];
+    const conversation = isObjectLike(options) ? asString(options.conversation) : undefined;
+    if (conversation) {
+      return conversation;
+    }
+  }
+  return undefined;
+}
+
+/** The `gen_ai.conversation.id` already on the active span, which for a child event is its operation span. */
+function getActiveSpanConversationId(): string | undefined {
+  const active = getActiveSpan();
+  return active ? asString(spanToJSON(active).attributes[GEN_AI_CONVERSATION_ID]) : undefined;
+}
+
 /**
  * `providerMetadata` is last-step only; drop derived usage on spans that report an aggregate.
  *
@@ -417,12 +443,20 @@ export function createSpanFromMessage(
     recordToolDescriptions(callId, event.tools);
   }
 
+  // Only an operation's start event carries `providerOptions`; its model-call and tool events start
+  // while the operation span is active, so they inherit the id from it. A root operation never
+  // inherits, so a nested call (e.g. inside a tool's `execute`) is not folded into the outer conversation.
+  const conversationId =
+    getOpenAiConversationId(event.providerOptions) ??
+    (ROOT_OPERATION_TYPES.has(type) ? undefined : getActiveSpanConversationId());
+
   const baseAttributes: SpanAttributes = {
     [SENTRY_ORIGIN]: ORIGIN,
     ...telemetryMetadataAttributes(event.telemetryMetadata),
     ...(provider ? { [GEN_AI_PROVIDER_NAME]: provider, [VERCEL_AI_MODEL_PROVIDER_ATTRIBUTE]: provider } : {}),
     ...(modelId ? { [GEN_AI_REQUEST_MODEL]: modelId } : {}),
     ...(maxRetries !== undefined ? { [VERCEL_AI_SETTINGS_MAX_RETRIES_ATTRIBUTE]: maxRetries } : {}),
+    ...(conversationId ? { [GEN_AI_CONVERSATION_ID]: conversationId } : {}),
   };
 
   switch (type) {
@@ -438,7 +472,7 @@ export function createSpanFromMessage(
 
       return buildModelCallSpan(event, baseAttributes, recordInputs, callId, modelId);
     case 'executeTool':
-      return buildToolSpan(event, recordInputs);
+      return buildToolSpan(event, recordInputs, conversationId);
     case 'embed':
     case 'embedMany': {
       // `embed` carries a single `value`; `embedMany` a `values` array — both map to the embeddings input.
@@ -542,7 +576,11 @@ function buildModelCallSpan(
   });
 }
 
-function buildToolSpan(event: Record<string, unknown>, recordInputs: boolean): Span {
+function buildToolSpan(
+  event: Record<string, unknown>,
+  recordInputs: boolean,
+  conversationId: string | undefined,
+): Span {
   const toolCall = isObjectLike(event.toolCall) ? event.toolCall : {};
   const toolName = asString(toolCall.toolName);
   const toolCallId = asString(event.toolCallId) ?? asString(toolCall.toolCallId);
@@ -557,6 +595,7 @@ function buildToolSpan(event: Record<string, unknown>, recordInputs: boolean): S
     ...(toolCallId ? { [GEN_AI_TOOL_CALL_ID_ATTRIBUTE]: toolCallId } : {}),
     ...(description ? { [GEN_AI_TOOL_DESCRIPTION]: description } : {}),
     ...(recordInputs && toolInput !== undefined ? { [GEN_AI_TOOL_CALL_ARGUMENTS]: stringify(toolInput) } : {}),
+    ...(conversationId ? { [GEN_AI_CONVERSATION_ID]: conversationId } : {}),
   });
 }
 
@@ -628,17 +667,11 @@ export function enrichSpanOnEnd(
     span.setAttribute(GEN_AI_RESPONSE_MODEL, responseModel);
   }
 
-  // Provider-specific cache/reasoning/prediction token breakdowns and `gen_ai.conversation.id`.
-  // The channel exposes `providerMetadata` as an object (the OTel path parses it from a string);
-  // both share `getProviderMetadataAttributes` so the emitted shape is identical.
+  // Provider-specific cache/reasoning/prediction token breakdowns. The channel exposes `providerMetadata`
+  // as an object (the OTel path parses it from a string); both share `getProviderMetadataAttributes` so
+  // the emitted shape is identical.
   const providerMetadata = (result as { providerMetadata?: unknown }).providerMetadata;
   const providerAttributes = getProviderMetadataAttributes(providerMetadata);
-  // Don't overwrite a conversation id already set on span start (e.g. by `conversationIdIntegration`
-  // from a user-set scope value); the provider-derived id is only a fallback. Matches the OTel path.
-  if (GEN_AI_CONVERSATION_ID in providerAttributes && spanToJSON(span).attributes[GEN_AI_CONVERSATION_ID]) {
-    // oxlint-disable-next-line typescript/no-dynamic-delete
-    delete providerAttributes[GEN_AI_CONVERSATION_ID];
-  }
   dropLastStepOnlyUsage(providerAttributes, type);
   span.setAttributes(providerAttributes);
 
 
@@ -676,6 +676,9 @@ function buildTextMessage(type: 'generateText' | 'streamText' | 'generateObject'
       // Normalize to the message-array shape the shared core (and v7's channel) expects: a bare string
       // `prompt` becomes a single user message, matching the SDK's own normalization.
       messages: normalizePromptMessages(options),
+      // v7's native start event carries `providerOptions`; the shared core reads the OpenAI
+      // Conversations API id from it.
+      providerOptions: options.providerOptions,
       telemetryMetadata: telemetry.metadata,
       ...recording(telemetry),
     },