#673 Add ReasoningEffort.minimal value (#700)

* Add ReasoningEffort.minimal value (#673)

* Update api files (#675)

* Add ReasoningEffortLevel.Minimal to CHANGELOG (#675)

* Update CHANGELOG.md

---------

Co-authored-by: Jesse Squire <[email protected]>

Author: kurnakovv

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Release History
 
+## 2.6.0-beta.1 (Unreleased)
+
+### Features Added
+
+- OpenAI.Chat:
+  - Added the `Minimal` property to `ChatReasoningEffortLevel`
+
+- OpenAI.Responses:
+  - Added the `Minimal` property to `ResponseReasoningEffortLevel`
+
 ## 2.5.0 (2025-09-23)
 
 ### Features Added

api/OpenAI.net8.0.cs

@@ -1970,6 +1970,7 @@ public class ChatOutputTokenUsageDetails : IJsonModel<ChatOutputTokenUsageDetail
         public static ChatReasoningEffortLevel High { get; }
         public static ChatReasoningEffortLevel Low { get; }
         public static ChatReasoningEffortLevel Medium { get; }
+        public static ChatReasoningEffortLevel Minimal { get; }
         public readonly bool Equals(ChatReasoningEffortLevel other);
         [EditorBrowsable(EditorBrowsableState.Never)]
         public override readonly bool Equals(object obj);
@@ -5641,6 +5642,7 @@ public class ResponseOutputTokenUsageDetails : IJsonModel<ResponseOutputTokenUsa
         public static ResponseReasoningEffortLevel High { get; }
         public static ResponseReasoningEffortLevel Low { get; }
         public static ResponseReasoningEffortLevel Medium { get; }
+        public static ResponseReasoningEffortLevel Minimal { get; }
         public readonly bool Equals(ResponseReasoningEffortLevel other);
         [EditorBrowsable(EditorBrowsableState.Never)]
         public override readonly bool Equals(object obj);

api/OpenAI.netstandard2.0.cs

@@ -1724,6 +1724,7 @@ public class ChatOutputTokenUsageDetails : IJsonModel<ChatOutputTokenUsageDetail
         public static ChatReasoningEffortLevel High { get; }
         public static ChatReasoningEffortLevel Low { get; }
         public static ChatReasoningEffortLevel Medium { get; }
+        public static ChatReasoningEffortLevel Minimal { get; }
         public readonly bool Equals(ChatReasoningEffortLevel other);
         [EditorBrowsable(EditorBrowsableState.Never)]
         public override readonly bool Equals(object obj);
@@ -4988,6 +4989,7 @@ public class ResponseOutputTokenUsageDetails : IJsonModel<ResponseOutputTokenUsa
         public static ResponseReasoningEffortLevel High { get; }
         public static ResponseReasoningEffortLevel Low { get; }
         public static ResponseReasoningEffortLevel Medium { get; }
+        public static ResponseReasoningEffortLevel Minimal { get; }
         public readonly bool Equals(ResponseReasoningEffortLevel other);
         [EditorBrowsable(EditorBrowsableState.Never)]
         public override readonly bool Equals(object obj);

specification/base/typespec/common/models.tsp

@@ -224,11 +224,12 @@ model ChatCompletionStreamOptions {
   
   Constrains effort on reasoning for
   [reasoning models](https://platform.openai.com/docs/guides/reasoning).
-  Currently supported values are `low`, `medium`, and `high`. Reducing
+  Currently supported values are `minimal`, `low`, `medium`, and `high`. Reducing
   reasoning effort can result in faster responses and fewer tokens used
   on reasoning in a response.
   """)
 union ReasoningEffort {
+  "minimal",
   "low",
   "medium",
   "high",

src/Generated/Models/Chat/ChatReasoningEffortLevel.cs

@@ -13,6 +13,7 @@ namespace OpenAI.Chat
     public readonly partial struct ChatReasoningEffortLevel : IEquatable<ChatReasoningEffortLevel>
     {
         private readonly string _value;
+        private const string MinimalValue = "minimal";
         private const string LowValue = "low";
         private const string MediumValue = "medium";
         private const string HighValue = "high";
@@ -24,6 +25,8 @@ public ChatReasoningEffortLevel(string value)
             _value = value;
         }
 
+        public static ChatReasoningEffortLevel Minimal { get; } = new ChatReasoningEffortLevel(MinimalValue);
+
         public static ChatReasoningEffortLevel Low { get; } = new ChatReasoningEffortLevel(LowValue);
 
         public static ChatReasoningEffortLevel Medium { get; } = new ChatReasoningEffortLevel(MediumValue);

src/Generated/Models/Responses/ResponseReasoningEffortLevel.cs

@@ -13,6 +13,7 @@ namespace OpenAI.Responses
     public readonly partial struct ResponseReasoningEffortLevel : IEquatable<ResponseReasoningEffortLevel>
     {
         private readonly string _value;
+        private const string MinimalValue = "minimal";
         private const string LowValue = "low";
         private const string MediumValue = "medium";
         private const string HighValue = "high";
@@ -24,6 +25,8 @@ public ResponseReasoningEffortLevel(string value)
             _value = value;
         }
 
+        public static ResponseReasoningEffortLevel Minimal { get; } = new ResponseReasoningEffortLevel(MinimalValue);
+
         public static ResponseReasoningEffortLevel Low { get; } = new ResponseReasoningEffortLevel(LowValue);
 
         public static ResponseReasoningEffortLevel Medium { get; } = new ResponseReasoningEffortLevel(MediumValue);