diff --git a/chat.go b/chat.go
index 0aa018715..33c9dbf46 100644
--- a/chat.go
+++ b/chat.go
@@ -119,6 +119,15 @@ type ChatCompletionMessage struct {
 
 	// For Role=tool prompts this should be set to the ID given in the assistant's prior request to call a tool.
 	ToolCallID string `json:"tool_call_id,omitempty"`
+
+	// To support Anthropic's thinking blocks, we need to add a new field to the ChatCompletionMessage struct.
+	ThinkingBlocks []ThinkingBlock `json:"thinking_blocks,omitempty"`
+}
+
+type ThinkingBlock struct {
+	Type      string `json:"type"`
+	Thinking  string `json:"thinking"`
+	Signature string `json:"signature"`
 }
 
 func (m ChatCompletionMessage) MarshalJSON() ([]byte, error) {
@@ -136,6 +145,7 @@ func (m ChatCompletionMessage) MarshalJSON() ([]byte, error) {
 			FunctionCall     *FunctionCall     `json:"function_call,omitempty"`
 			ToolCalls        []ToolCall        `json:"tool_calls,omitempty"`
 			ToolCallID       string            `json:"tool_call_id,omitempty"`
+			ThinkingBlocks   []ThinkingBlock   `json:"thinking_blocks,omitempty"`
 		}(m)
 		return json.Marshal(msg)
 	}
@@ -150,6 +160,7 @@ func (m ChatCompletionMessage) MarshalJSON() ([]byte, error) {
 		FunctionCall     *FunctionCall     `json:"function_call,omitempty"`
 		ToolCalls        []ToolCall        `json:"tool_calls,omitempty"`
 		ToolCallID       string            `json:"tool_call_id,omitempty"`
+		ThinkingBlocks   []ThinkingBlock   `json:"thinking_blocks,omitempty"`
 	}(m)
 	return json.Marshal(msg)
 }
@@ -160,11 +171,12 @@ func (m *ChatCompletionMessage) UnmarshalJSON(bs []byte) error {
 		Content          string `json:"content"`
 		Refusal          string `json:"refusal,omitempty"`
 		MultiContent     []ChatMessagePart
-		Name             string        `json:"name,omitempty"`
-		ReasoningContent string        `json:"reasoning_content,omitempty"`
-		FunctionCall     *FunctionCall `json:"function_call,omitempty"`
-		ToolCalls        []ToolCall    `json:"tool_calls,omitempty"`
-		ToolCallID       string        `json:"tool_call_id,omitempty"`
+		Name             string          `json:"name,omitempty"`
+		ReasoningContent string          `json:"reasoning_content,omitempty"`
+		FunctionCall     *FunctionCall   `json:"function_call,omitempty"`
+		ToolCalls        []ToolCall      `json:"tool_calls,omitempty"`
+		ToolCallID       string          `json:"tool_call_id,omitempty"`
+		ThinkingBlocks   []ThinkingBlock `json:"thinking_blocks,omitempty"`
 	}{}
 
 	if err := json.Unmarshal(bs, &msg); err == nil {
@@ -181,6 +193,7 @@ func (m *ChatCompletionMessage) UnmarshalJSON(bs []byte) error {
 		FunctionCall     *FunctionCall     `json:"function_call,omitempty"`
 		ToolCalls        []ToolCall        `json:"tool_calls,omitempty"`
 		ToolCallID       string            `json:"tool_call_id,omitempty"`
+		ThinkingBlocks   []ThinkingBlock   `json:"thinking_blocks,omitempty"`
 	}{}
 	if err := json.Unmarshal(bs, &multiMsg); err != nil {
 		return err
@@ -256,7 +269,14 @@ type ChatCompletionRequestExtensions struct {
 	// is used to constrain the model's responses to a controlled set of options,
 	// ensuring predictable and consistent outputs in scenarios where specific
 	// choices are required.
-	GuidedChoice []string `json:"guided_choice,omitempty"`
+	GuidedChoice []string   `json:"guided_choice,omitempty"`
+	NoLog        bool       `json:"no-log,omitempty"`
+	Anthropic    *Anthropic `json:"-"`
+}
+
+// Anthropic is for Anthropic specific parameter fields made through the OpenAI API
+type Anthropic struct {
+	BetaFeatures []string `json:"beta_features,omitempty"`
 }
 
 // ChatCompletionRequest represents a request structure for chat completion API.
@@ -350,8 +370,10 @@ const (
 )
 
 type Tool struct {
-	Type     ToolType            `json:"type"`
-	Function *FunctionDefinition `json:"function,omitempty"`
+	Type          ToolType            `json:"type"`
+	Function      *FunctionDefinition `json:"function,omitempty"`
+	Name          string              `json:"name,omitempty"`
+	MaxCharacters int                 `json:"max_characters,omitempty"`
 }
 
 type ToolChoice struct {
diff --git a/chat_stream.go b/chat_stream.go
index 80d16cc63..643d88788 100644
--- a/chat_stream.go
+++ b/chat_stream.go
@@ -16,7 +16,12 @@ type ChatCompletionStreamChoiceDelta struct {
 	// which is not in the official documentation.
 	// the doc from deepseek:
 	// - https://api-docs.deepseek.com/api/create-chat-completion#responses
-	ReasoningContent string `json:"reasoning_content,omitempty"`
+	ReasoningContent       string                 `json:"reasoning_content,omitempty"`
+	ProviderSpecificFields ProviderSpecificFields `json:"provider_specific_fields,omitempty"`
+}
+
+type ProviderSpecificFields struct {
+	ThinkingBlocks []ThinkingBlock `json:"thinking_blocks,omitempty"`
 }
 
 type ChatCompletionStreamChoiceLogprobs struct {