release: 2.51.0

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "2.50.0"
+  ".": "2.51.0"
 }

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 278
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai/openai-9152683f2fa71f5555cbbb53123ec013b7c83ee6fed4333e76c22a6f48a05f1c.yml
-openapi_spec_hash: c58a8c1bb1f5bb7245323db9437bd67f
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai/openai-44d4add500460ed21ac9ae1d6dd4047a32a79d3b4c3a9d9754f6ecf8cbdb9eec.yml
+openapi_spec_hash: 8a34ba094583f56e975067493574fa69
 config_hash: ca12d10f1dbe101a81cd0376f868c674

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## 2.51.0 (2026-07-30)
+
+Full Changelog: [v2.50.0...v2.51.0](https://github.com/openai/openai-python/compare/v2.50.0...v2.51.0)
+
+### Features
+
+* **api:** fast tier ([8808ed2](https://github.com/openai/openai-python/commit/8808ed27952dae13fb8761f045376af5b3e5bec2))
+
+
+### Bug Fixes
+
+* **api:** add fast tier to helper methods ([6064126](https://github.com/openai/openai-python/commit/60641266ff4b296044a81fe1717c17a70ceadbf1))
+
 ## 2.50.0 (2026-07-28)
 
 Full Changelog: [v2.49.0...v2.50.0](https://github.com/openai/openai-python/compare/v2.49.0...v2.50.0)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "2.50.0"
+version = "2.51.0"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"

src/openai/_version.py

@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "openai"
-__version__ = "2.50.0"  # x-release-please-version
+__version__ = "2.51.0"  # x-release-please-version

src/openai/resources/beta/responses/responses.py

@@ -227,7 +227,7 @@ def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream: Optional[Literal[False]] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
@@ -394,9 +394,13 @@ def create(
                 will use 'default'.
               - If set to 'default', then the request will be processed with the standard
                 pricing and performance for the selected model.
-              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)' or
-                '[priority](https://openai.com/api-priority-processing/)', then the request
-                will be processed with the corresponding service tier.
+              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)',
+                then the request will be processed with the Flex Processing service tier.
+              - To opt-in to [Fast mode](/api/docs/guides/fast-mode) at the request level,
+                include the `service_tier=fast` or `service_tier=priority` parameter for
+                Responses or Chat Completions. The response will show `service_tier=priority`
+                regardless of if you specify `service_tier=fast` or `priority` in your
+                request.
               - When not set, the default behavior is 'auto'.
 
               When the `service_tier` parameter is set, the response body will include the
@@ -609,7 +613,7 @@ def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
         temperature: Optional[float] | Omit = omit,
@@ -782,9 +786,13 @@ def create(
                 will use 'default'.
               - If set to 'default', then the request will be processed with the standard
                 pricing and performance for the selected model.
-              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)' or
-                '[priority](https://openai.com/api-priority-processing/)', then the request
-                will be processed with the corresponding service tier.
+              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)',
+                then the request will be processed with the Flex Processing service tier.
+              - To opt-in to [Fast mode](/api/docs/guides/fast-mode) at the request level,
+                include the `service_tier=fast` or `service_tier=priority` parameter for
+                Responses or Chat Completions. The response will show `service_tier=priority`
+                regardless of if you specify `service_tier=fast` or `priority` in your
+                request.
               - When not set, the default behavior is 'auto'.
 
               When the `service_tier` parameter is set, the response body will include the
@@ -990,7 +998,7 @@ def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
         temperature: Optional[float] | Omit = omit,
@@ -1163,9 +1171,13 @@ def create(
                 will use 'default'.
               - If set to 'default', then the request will be processed with the standard
                 pricing and performance for the selected model.
-              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)' or
-                '[priority](https://openai.com/api-priority-processing/)', then the request
-                will be processed with the corresponding service tier.
+              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)',
+                then the request will be processed with the Flex Processing service tier.
+              - To opt-in to [Fast mode](/api/docs/guides/fast-mode) at the request level,
+                include the `service_tier=fast` or `service_tier=priority` parameter for
+                Responses or Chat Completions. The response will show `service_tier=priority`
+                regardless of if you specify `service_tier=fast` or `priority` in your
+                request.
               - When not set, the default behavior is 'auto'.
 
               When the `service_tier` parameter is set, the response body will include the
@@ -1369,7 +1381,7 @@ def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream: Optional[Literal[False]] | Literal[True] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
@@ -2109,7 +2121,7 @@ async def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream: Optional[Literal[False]] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
@@ -2276,9 +2288,13 @@ async def create(
                 will use 'default'.
               - If set to 'default', then the request will be processed with the standard
                 pricing and performance for the selected model.
-              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)' or
-                '[priority](https://openai.com/api-priority-processing/)', then the request
-                will be processed with the corresponding service tier.
+              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)',
+                then the request will be processed with the Flex Processing service tier.
+              - To opt-in to [Fast mode](/api/docs/guides/fast-mode) at the request level,
+                include the `service_tier=fast` or `service_tier=priority` parameter for
+                Responses or Chat Completions. The response will show `service_tier=priority`
+                regardless of if you specify `service_tier=fast` or `priority` in your
+                request.
               - When not set, the default behavior is 'auto'.
 
               When the `service_tier` parameter is set, the response body will include the
@@ -2491,7 +2507,7 @@ async def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
         temperature: Optional[float] | Omit = omit,
@@ -2664,9 +2680,13 @@ async def create(
                 will use 'default'.
               - If set to 'default', then the request will be processed with the standard
                 pricing and performance for the selected model.
-              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)' or
-                '[priority](https://openai.com/api-priority-processing/)', then the request
-                will be processed with the corresponding service tier.
+              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)',
+                then the request will be processed with the Flex Processing service tier.
+              - To opt-in to [Fast mode](/api/docs/guides/fast-mode) at the request level,
+                include the `service_tier=fast` or `service_tier=priority` parameter for
+                Responses or Chat Completions. The response will show `service_tier=priority`
+                regardless of if you specify `service_tier=fast` or `priority` in your
+                request.
               - When not set, the default behavior is 'auto'.
 
               When the `service_tier` parameter is set, the response body will include the
@@ -2872,7 +2892,7 @@ async def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
         temperature: Optional[float] | Omit = omit,
@@ -3045,9 +3065,13 @@ async def create(
                 will use 'default'.
               - If set to 'default', then the request will be processed with the standard
                 pricing and performance for the selected model.
-              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)' or
-                '[priority](https://openai.com/api-priority-processing/)', then the request
-                will be processed with the corresponding service tier.
+              - If set to '[flex](https://platform.openai.com/docs/guides/flex-processing)',
+                then the request will be processed with the Flex Processing service tier.
+              - To opt-in to [Fast mode](/api/docs/guides/fast-mode) at the request level,
+                include the `service_tier=fast` or `service_tier=priority` parameter for
+                Responses or Chat Completions. The response will show `service_tier=priority`
+                regardless of if you specify `service_tier=fast` or `priority` in your
+                request.
               - When not set, the default behavior is 'auto'.
 
               When the `service_tier` parameter is set, the response body will include the
@@ -3251,7 +3275,7 @@ async def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[response_create_params.Reasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream: Optional[Literal[False]] | Literal[True] | Omit = omit,
         stream_options: Optional[response_create_params.StreamOptions] | Omit = omit,
@@ -4995,7 +5019,7 @@ def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[beta_responses_client_event_param.ResponseCreateReasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream: Optional[bool] | Omit = omit,
         stream_options: Optional[beta_responses_client_event_param.ResponseCreateStreamOptions] | Omit = omit,
@@ -5198,7 +5222,7 @@ async def create(
         prompt_cache_retention: Optional[Literal["in_memory", "24h"]] | Omit = omit,
         reasoning: Optional[beta_responses_client_event_param.ResponseCreateReasoning] | Omit = omit,
         safety_identifier: Optional[str] | Omit = omit,
-        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority"]] | Omit = omit,
+        service_tier: Optional[Literal["auto", "default", "flex", "scale", "priority", "fast"]] | Omit = omit,
         store: Optional[bool] | Omit = omit,
         stream: Optional[bool] | Omit = omit,
         stream_options: Optional[beta_responses_client_event_param.ResponseCreateStreamOptions] | Omit = omit,