diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 393c24840d..03128d3ade 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.99.5"
+  ".": "1.99.6"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d332955ef..8edff34439 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## 1.99.6 (2025-08-09)
+
+Full Changelog: [v1.99.5...v1.99.6](https://github.com/openai/openai-python/compare/v1.99.5...v1.99.6)
+
+### Bug Fixes
+
+* **types:** re-export more tool call types ([8fe5741](https://github.com/openai/openai-python/commit/8fe574131cfe8f0453788cc6105d22834e7c102f))
+
+
+### Chores
+
+* **internal:** update comment in script ([e407bb5](https://github.com/openai/openai-python/commit/e407bb52112ad73e5eedf929434ee4ff7ac5a5a8))
+* update @stainless-api/prism-cli to v5.15.0 ([a1883fc](https://github.com/openai/openai-python/commit/a1883fcdfa02b81e5129bdb43206597a51f885fa))
+
 ## 1.99.5 (2025-08-08)
 
 Full Changelog: [v1.99.4...v1.99.5](https://github.com/openai/openai-python/compare/v1.99.4...v1.99.5)
diff --git a/pyproject.toml b/pyproject.toml
index ca255c95bd..37e9d4f767 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "1.99.5"
+version = "1.99.6"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/scripts/mock b/scripts/mock
index d2814ae6a0..0b28f6ea23 100755
--- a/scripts/mock
+++ b/scripts/mock
@@ -21,7 +21,7 @@ echo "==> Starting mock server with URL ${URL}"
 
 # Run prism mock on the given spec
 if [ "$1" == "--daemon" ]; then
-  npm exec --package=@stainless-api/prism-cli@5.8.5 -- prism mock "$URL" &> .prism.log &
+  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL" &> .prism.log &
 
   # Wait for server to come online
   echo -n "Waiting for server"
@@ -37,5 +37,5 @@ if [ "$1" == "--daemon" ]; then
 
   echo
 else
-  npm exec --package=@stainless-api/prism-cli@5.8.5 -- prism mock "$URL"
+  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL"
 fi
diff --git a/scripts/test b/scripts/test
index 2b87845670..dbeda2d217 100755
--- a/scripts/test
+++ b/scripts/test
@@ -43,7 +43,7 @@ elif ! prism_is_running ; then
   echo -e "To run the server, pass in the path or url of your OpenAPI"
   echo -e "spec to the prism command:"
   echo
-  echo -e "  \$ ${YELLOW}npm exec --package=@stoplight/prism-cli@~5.3.2 -- prism mock path/to/your.openapi.yml${NC}"
+  echo -e "  \$ ${YELLOW}npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock path/to/your.openapi.yml${NC}"
   echo
 
   exit 1
diff --git a/src/openai/_version.py b/src/openai/_version.py
index 12270a03d4..eed63aadba 100644
--- a/src/openai/_version.py
+++ b/src/openai/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "openai"
-__version__ = "1.99.5"  # x-release-please-version
+__version__ = "1.99.6"  # x-release-please-version
diff --git a/src/openai/types/chat/chat_completion_message_tool_call.py b/src/openai/types/chat/chat_completion_message_tool_call.py
index c254774626..94cc086e9d 100644
--- a/src/openai/types/chat/chat_completion_message_tool_call.py
+++ b/src/openai/types/chat/chat_completion_message_tool_call.py
@@ -5,9 +5,9 @@
 
 from ..._utils import PropertyInfo
 from .chat_completion_message_custom_tool_call import ChatCompletionMessageCustomToolCall
-from .chat_completion_message_function_tool_call import ChatCompletionMessageFunctionToolCall
+from .chat_completion_message_function_tool_call import Function as Function, ChatCompletionMessageFunctionToolCall
 
-__all__ = ["ChatCompletionMessageToolCall"]
+__all__ = ["ChatCompletionMessageToolCall", "Function"]
 
 ChatCompletionMessageToolCall: TypeAlias = Annotated[
     Union[ChatCompletionMessageFunctionToolCall, ChatCompletionMessageCustomToolCall],
diff --git a/src/openai/types/chat/chat_completion_tool_param.py b/src/openai/types/chat/chat_completion_tool_param.py
index ef3b6d07c6..a18b13b471 100644
--- a/src/openai/types/chat/chat_completion_tool_param.py
+++ b/src/openai/types/chat/chat_completion_tool_param.py
@@ -4,8 +4,11 @@
 
 from typing_extensions import TypeAlias
 
-from .chat_completion_function_tool_param import ChatCompletionFunctionToolParam
+from .chat_completion_function_tool_param import (
+    FunctionDefinition as FunctionDefinition,
+    ChatCompletionFunctionToolParam,
+)
 
-__all__ = ["ChatCompletionToolParam"]
+__all__ = ["ChatCompletionToolParam", "FunctionDefinition"]
 
 ChatCompletionToolParam: TypeAlias = ChatCompletionFunctionToolParam