diff --git a/.stats.yml b/.stats.yml
index fdef8d2..4827e53 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 68
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-fb9db2d2c1f0d6b39d8ee042db5d5c59acba6ad1daf47c18792c1f5fb24b3401.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-aa9b01fc0c17eb0cbc200533fc20d6a49c5e764ceaf8049e08b294532be6e9ff.yml
diff --git a/batch.go b/batch.go
index b861bac..7becfa8 100644
--- a/batch.go
+++ b/batch.go
@@ -308,7 +308,7 @@ type BatchNewParams struct {
 	// Your input file must be formatted as a
 	// [JSONL file](https://platform.openai.com/docs/api-reference/batch/request-input),
 	// and must be uploaded with the purpose `batch`. The file can contain up to 50,000
-	// requests, and can be up to 100 MB in size.
+	// requests, and can be up to 200 MB in size.
 	InputFileID param.Field[string] `json:"input_file_id,required"`
 	// Optional custom metadata for the batch.
 	Metadata param.Field[map[string]string] `json:"metadata"`
diff --git a/chat.go b/chat.go
index c685a92..b298e58 100644
--- a/chat.go
+++ b/chat.go
@@ -35,6 +35,7 @@ const (
 	ChatModelO1Mini                         ChatModel = "o1-mini"
 	ChatModelO1Mini2024_09_12               ChatModel = "o1-mini-2024-09-12"
 	ChatModelGPT4o                          ChatModel = "gpt-4o"
+	ChatModelGPT4o2024_11_20                ChatModel = "gpt-4o-2024-11-20"
 	ChatModelGPT4o2024_08_06                ChatModel = "gpt-4o-2024-08-06"
 	ChatModelGPT4o2024_05_13                ChatModel = "gpt-4o-2024-05-13"
 	ChatModelGPT4oRealtimePreview           ChatModel = "gpt-4o-realtime-preview"
diff --git a/chatcompletion.go b/chatcompletion.go
index f2dbbc5..242776b 100644
--- a/chatcompletion.go
+++ b/chatcompletion.go
@@ -454,8 +454,9 @@ type ChatCompletionAudioParam struct {
 	// Specifies the output audio format. Must be one of `wav`, `mp3`, `flac`, `opus`,
 	// or `pcm16`.
 	Format param.Field[ChatCompletionAudioParamFormat] `json:"format,required"`
-	// The voice the model uses to respond. Supported voices are `alloy`, `ash`,
-	// `ballad`, `coral`, `echo`, `sage`, `shimmer`, and `verse`.
+	// The voice the model uses to respond. Supported voices are `ash`, `ballad`,
+	// `coral`, `sage`, and `verse` (also supported but not recommended are `alloy`,
+	// `echo`, and `shimmer`; these voices are less expressive).
 	Voice param.Field[ChatCompletionAudioParamVoice] `json:"voice,required"`
 }
 
@@ -483,8 +484,9 @@ func (r ChatCompletionAudioParamFormat) IsKnown() bool {
 	return false
 }
 
-// The voice the model uses to respond. Supported voices are `alloy`, `ash`,
-// `ballad`, `coral`, `echo`, `sage`, `shimmer`, and `verse`.
+// The voice the model uses to respond. Supported voices are `ash`, `ballad`,
+// `coral`, `sage`, and `verse` (also supported but not recommended are `alloy`,
+// `echo`, and `shimmer`; these voices are less expressive).
 type ChatCompletionAudioParamVoice string
 
 const (
diff --git a/file.go b/file.go
index 2b6584c..9fa551f 100644
--- a/file.go
+++ b/file.go
@@ -55,7 +55,7 @@ func NewFileService(opts ...option.RequestOption) (r *FileService) {
 // [completions](https://platform.openai.com/docs/api-reference/fine-tuning/completions-input)
 // models.
 //
-// The Batch API only supports `.jsonl` files up to 100 MB in size. The input also
+// The Batch API only supports `.jsonl` files up to 200 MB in size. The input also
 // has a specific required
 // [format](https://platform.openai.com/docs/api-reference/batch/request-input).
 //