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       "version": "5.26.5",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
diff --git a/packages/instrumentation-openai/.tav.yml b/packages/instrumentation-openai/.tav.yml
index ac264a8790..719a70f151 100644
--- a/packages/instrumentation-openai/.tav.yml
+++ b/packages/instrumentation-openai/.tav.yml
@@ -1,5 +1,5 @@
 openai:
   versions:
-    include: '>=4.19.0 <6'
+    include: '>=4.19.0 <7'
     mode: max-5
   commands: npm test
diff --git a/packages/instrumentation-openai/README.md b/packages/instrumentation-openai/README.md
index 4f030da907..e839949c9e 100644
--- a/packages/instrumentation-openai/README.md
+++ b/packages/instrumentation-openai/README.md
@@ -15,7 +15,7 @@ npm install --save @opentelemetry/instrumentation-openai
 
 ## Supported Versions
 
-- openai `>=4.19.0 <6`
+- openai `>=4.19.0 <7`
 
 ## Usage
 
diff --git a/packages/instrumentation-openai/package.json b/packages/instrumentation-openai/package.json
index 8f6a133141..82a7db29fa 100644
--- a/packages/instrumentation-openai/package.json
+++ b/packages/instrumentation-openai/package.json
@@ -11,7 +11,7 @@
   },
   "scripts": {
     "clean": "rimraf build/*",
-    "compile:with-dependencies": "nx run-many -t compile -p @opentelemetry/instrumentation-mongodb",
+    "compile:with-dependencies": "nx run-many -t compile -p @opentelemetry/instrumentation-openai",
     "compile": "tsc -p .",
     "lint": "eslint . --ext=ts,js,mjs",
     "lint:fix": "eslint . --ext=ts,js,mjs --fix",
@@ -60,7 +60,7 @@
     "expect": "29.2.0",
     "nock": "^14.0.0",
     "nyc": "17.1.0",
-    "openai": "4.104.0",
+    "openai": "^6.2.0",
     "rimraf": "5.0.10",
     "safe-stable-stringify": "^2.4.1",
     "sinon": "15.2.0",
diff --git a/packages/instrumentation-openai/src/instrumentation.ts b/packages/instrumentation-openai/src/instrumentation.ts
index 22277c711f..492c1c1d16 100644
--- a/packages/instrumentation-openai/src/instrumentation.ts
+++ b/packages/instrumentation-openai/src/instrumentation.ts
@@ -35,7 +35,6 @@ import type {
   ChatCompletionChunk,
   Completions as ChatCompletions,
 } from 'openai/resources/chat/completions';
-import type { APIPromise } from 'openai/core';
 import type {
   CreateEmbeddingResponse,
   Embeddings,
@@ -69,12 +68,14 @@ import { PACKAGE_NAME, PACKAGE_VERSION } from './version';
 import { getEnvBool, getAttrsFromBaseURL } from './utils';
 import { OpenAIInstrumentationConfig } from './types';
 import {
+  APIPromise,
   GenAIMessage,
   GenAIChoiceEventBody,
   GenAISystemMessageEventBody,
   GenAIUserMessageEventBody,
   GenAIAssistantMessageEventBody,
   GenAIToolMessageEventBody,
+  GenAIToolCall,
 } from './internal-types';
 
 // The JS semconv package doesn't yet emit constants for event names.
@@ -115,7 +116,7 @@ export class OpenAIInstrumentation extends InstrumentationBase<OpenAIInstrumenta
     return [
       new InstrumentationNodeModuleDefinition(
         'openai',
-        ['>=4.19.0 <6'],
+        ['>=4.19.0 <7'],
         modExports => {
           this._wrap(
             modExports.OpenAI.Chat.Completions.prototype,
@@ -168,7 +169,7 @@ export class OpenAIInstrumentation extends InstrumentationBase<OpenAIInstrumenta
     );
   }
 
-  _getPatchedChatCompletionsCreate() {
+  _getPatchedChatCompletionsCreate(): any {
     const self = this;
     return (original: ChatCompletions['create']) => {
       // https://platform.openai.com/docs/api-reference/chat/create
@@ -367,23 +368,35 @@ export class OpenAIInstrumentation extends InstrumentationBase<OpenAIInstrumenta
                 body.content = msg.content;
               }
             }
+            // As of openai@5.12.1, type ChatCompletionMessageToolCall can
+            // have type="custom" which has no `function` property. As well,
+            // GenAI semconv has since changed how it captures tool calls.
+            // For now we just cope: we could capture
+            // `ChatCompletionMessageCustomToolCall.Custom` properties, but we
+            // don't for now.
             body.tool_calls = msg.tool_calls?.map(tc => {
-              return {
+              const repr: GenAIToolCall = {
                 id: tc.id,
                 type: tc.type,
-                function: {
+              };
+              if (tc.type === 'function') {
+                repr.function = {
                   name: tc.function.name,
                   arguments: tc.function.arguments,
-                },
-              };
+                };
+              }
+              return repr;
             });
           } else {
             body.tool_calls = msg.tool_calls?.map(tc => {
-              return {
+              const repr: GenAIToolCall = {
                 id: tc.id,
                 type: tc.type,
-                function: { name: tc.function.name },
               };
+              if (tc.type === 'function') {
+                repr.function = { name: tc.function.name };
+              }
+              return repr;
             });
           }
           this.logger.emit({
@@ -479,21 +492,27 @@ export class OpenAIInstrumentation extends InstrumentationBase<OpenAIInstrumenta
         if (!choices[idx].toolCalls) {
           choices[idx].toolCalls = [];
         }
-        const toolCalls = choices[idx].toolCalls;
+        const toolCalls: GenAIToolCall[] = choices[idx].toolCalls;
         if (toolCallPart.id) {
           // First chunk in a tool call.
-          toolCalls.push({
+          const repr: GenAIToolCall = {
             id: toolCallPart.id,
             type: toolCallPart.type,
-            function: {
+          };
+          if (toolCallPart.type === 'function') {
+            repr.function = {
               name: toolCallPart.function?.name,
               arguments: toolCallPart.function?.arguments ?? '',
-            },
-          });
+            };
+          }
+          toolCalls.push(repr);
         } else if (toolCalls.length > 0) {
           // A tool call chunk with more of the `function.arguments`.
-          toolCalls[toolCalls.length - 1].function.arguments +=
-            toolCallPart.function?.arguments ?? '';
+          const lastPart = toolCalls[toolCalls.length - 1];
+          if (lastPart.function !== undefined) {
+            lastPart.function.arguments +=
+              toolCallPart.function?.arguments ?? '';
+          }
         }
       }
       if (!id && chunk.id) {
@@ -626,11 +645,14 @@ export class OpenAIInstrumentation extends InstrumentationBase<OpenAIInstrumenta
         } else {
           if (choice.message.tool_calls) {
             message.tool_calls = choice.message.tool_calls.map(tc => {
-              return {
+              const repr: GenAIToolCall = {
                 id: tc.id,
                 type: tc.type,
-                function: { name: tc.function.name },
               };
+              if (tc.type === 'function') {
+                repr.function = { name: tc.function.name };
+              }
+              return repr;
             });
           }
         }
@@ -712,7 +734,7 @@ export class OpenAIInstrumentation extends InstrumentationBase<OpenAIInstrumenta
     };
   }
 
-  _getPatchedEmbeddingsCreate() {
+  _getPatchedEmbeddingsCreate(): any {
     const self = this;
     return (original: Embeddings['create']) => {
       // https://platform.openai.com/docs/api-reference/embeddings/create
diff --git a/packages/instrumentation-openai/src/internal-types.ts b/packages/instrumentation-openai/src/internal-types.ts
index 98476f1d20..c1601ddfac 100644
--- a/packages/instrumentation-openai/src/internal-types.ts
+++ b/packages/instrumentation-openai/src/internal-types.ts
@@ -15,6 +15,12 @@
  */
 import { AnyValue } from '@opentelemetry/api-logs';
 
+// This mimicks `APIPromise` from `openai` sufficiently for usage in this
+// instrumentation. OpenAI's APIPromise adds some methods, but we don't use
+// those. We don't import the type directly from `openai` because how to
+// import it has changed between openai@4 and openai@5.
+export type APIPromise<T> = Promise<T>;
+
 export type GenAIFunction = {
   name: string;
   arguments?: AnyValue;
@@ -23,7 +29,7 @@ export type GenAIFunction = {
 export type GenAIToolCall = {
   id: string;
   type: string;
-  function: GenAIFunction;
+  function?: GenAIFunction;
 };
 
 export type GenAIMessage = {