diff --git a/.stats.yml b/.stats.yml
index 70f28c76..150fc433 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 9
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/anthropic-c7baafa4b7d58ae2b830c0d5b89248e98421c8a7cf135b7e62e6e215fa94c7f4.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/anthropic-b629ddf1f1f1473462fc9bdb605abd5b7be51c3ba91c34750cd46e8404aec356.yml
diff --git a/src/anthropic/resources/beta/messages/batches.py b/src/anthropic/resources/beta/messages/batches.py
index 897445e5..045c0580 100644
--- a/src/anthropic/resources/beta/messages/batches.py
+++ b/src/anthropic/resources/beta/messages/batches.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from typing import List, Iterable
+from itertools import chain
 
 import httpx
 
@@ -90,7 +91,13 @@ def create(
           timeout: Override the client-level default timeout for this request, in seconds
         """
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -137,7 +144,13 @@ def retrieve(
         if not message_batch_id:
             raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -188,7 +201,13 @@ def list(
           timeout: Override the client-level default timeout for this request, in seconds
         """
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -245,7 +264,13 @@ def cancel(
         if not message_batch_id:
             raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -293,7 +318,13 @@ def results(
             raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
         extra_headers = {"Accept": "application/binary", **(extra_headers or {})}
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -359,7 +390,13 @@ async def create(
           timeout: Override the client-level default timeout for this request, in seconds
         """
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -406,7 +443,13 @@ async def retrieve(
         if not message_batch_id:
             raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -457,7 +500,13 @@ def list(
           timeout: Override the client-level default timeout for this request, in seconds
         """
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -514,7 +563,13 @@ async def cancel(
         if not message_batch_id:
             raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
@@ -562,7 +617,13 @@ async def results(
             raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
         extra_headers = {"Accept": "application/binary", **(extra_headers or {})}
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
diff --git a/src/anthropic/resources/beta/prompt_caching/messages.py b/src/anthropic/resources/beta/prompt_caching/messages.py
index 7ce96c2e..522e9d37 100644
--- a/src/anthropic/resources/beta/prompt_caching/messages.py
+++ b/src/anthropic/resources/beta/prompt_caching/messages.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from typing import List, Union, Iterable
+from itertools import chain
 from typing_extensions import Literal, overload
 
 import httpx
@@ -877,7 +878,13 @@ def create(
         if not is_given(timeout) and self._client.timeout == DEFAULT_TIMEOUT:
             timeout = 600
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["prompt-caching-2024-07-31"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "prompt-caching-2024-07-31", **(extra_headers or {})}
@@ -1748,7 +1755,13 @@ async def create(
         if not is_given(timeout) and self._client.timeout == DEFAULT_TIMEOUT:
             timeout = 600
         extra_headers = {
-            **strip_not_given({"anthropic-beta": ",".join(str(e) for e in betas) if is_given(betas) else NOT_GIVEN}),
+            **strip_not_given(
+                {
+                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["prompt-caching-2024-07-31"]))
+                    if is_given(betas)
+                    else NOT_GIVEN
+                }
+            ),
             **(extra_headers or {}),
         }
         extra_headers = {"anthropic-beta": "prompt-caching-2024-07-31", **(extra_headers or {})}