diff --git a/common/conv/any.go b/common/conv/any.go
new file mode 100644
index 00000000..467e8bb7
--- /dev/null
+++ b/common/conv/any.go
@@ -0,0 +1,6 @@
+package conv
+
+func AsString(v any) string {
+	str, _ := v.(string)
+	return str
+}
diff --git a/common/model-ratio.go b/common/model-ratio.go
index 74871880..4f6acb7b 100644
--- a/common/model-ratio.go
+++ b/common/model-ratio.go
@@ -76,7 +76,7 @@ var ModelRatio = map[string]float64{
 	"ERNIE-Bot":       0.8572,     // ￥0.012 / 1k tokens
 	"ERNIE-Bot-turbo": 0.5715,     // ￥0.008 / 1k tokens
 	"ERNIE-Bot-4":     0.12 * RMB, // ￥0.12 / 1k tokens
-	"ERNIE-Bot-8k":    0.024 * RMB,
+	"ERNIE-Bot-8K":    0.024 * RMB,
 	"Embedding-V1":    0.1429, // ￥0.002 / 1k tokens
 	"bge-large-zh":    0.002 * RMB,
 	"bge-large-en":    0.002 * RMB,
diff --git a/relay/channel/anthropic/main.go b/relay/channel/anthropic/main.go
index 7fbf9f25..198b66ad 100644
--- a/relay/channel/anthropic/main.go
+++ b/relay/channel/anthropic/main.go
@@ -39,6 +39,7 @@ func ConvertRequest(textRequest model.GeneralOpenAIRequest) *Request {
 		MaxTokens:   textRequest.MaxTokens,
 		Temperature: textRequest.Temperature,
 		TopP:        textRequest.TopP,
+		TopK:        textRequest.TopK,
 		Stream:      textRequest.Stream,
 	}
 	if claudeRequest.MaxTokens == 0 {
diff --git a/relay/channel/openai/main.go b/relay/channel/openai/main.go
index d47cd164..63cb9ae8 100644
--- a/relay/channel/openai/main.go
+++ b/relay/channel/openai/main.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"github.com/gin-gonic/gin"
 	"github.com/songquanpeng/one-api/common"
+	"github.com/songquanpeng/one-api/common/conv"
 	"github.com/songquanpeng/one-api/common/logger"
 	"github.com/songquanpeng/one-api/relay/constant"
 	"github.com/songquanpeng/one-api/relay/model"
@@ -53,7 +54,7 @@ func StreamHandler(c *gin.Context, resp *http.Response, relayMode int) (*model.E
 						continue // just ignore the error
 					}
 					for _, choice := range streamResponse.Choices {
-						responseText += choice.Delta.Content
+						responseText += conv.AsString(choice.Delta.Content)
 					}
 					if streamResponse.Usage != nil {
 						usage = streamResponse.Usage
diff --git a/relay/channel/openai/model.go b/relay/channel/openai/model.go
index 6c0b2c53..30d77739 100644
--- a/relay/channel/openai/model.go
+++ b/relay/channel/openai/model.go
@@ -118,12 +118,9 @@ type ImageResponse struct {
 }
 
 type ChatCompletionsStreamResponseChoice struct {
-	Index int `json:"index"`
-	Delta struct {
-		Content string `json:"content"`
-		Role    string `json:"role,omitempty"`
-	} `json:"delta"`
-	FinishReason *string `json:"finish_reason,omitempty"`
+	Index        int           `json:"index"`
+	Delta        model.Message `json:"delta"`
+	FinishReason *string       `json:"finish_reason,omitempty"`
 }
 
 type ChatCompletionsStreamResponse struct {
diff --git a/relay/model/general.go b/relay/model/general.go
index fbcc04e8..86facf04 100644
--- a/relay/model/general.go
+++ b/relay/model/general.go
@@ -5,25 +5,27 @@ type ResponseFormat struct {
 }
 
 type GeneralOpenAIRequest struct {
-	Model            string          `json:"model,omitempty"`
 	Messages         []Message       `json:"messages,omitempty"`
-	Prompt           any             `json:"prompt,omitempty"`
-	Stream           bool            `json:"stream,omitempty"`
-	MaxTokens        int             `json:"max_tokens,omitempty"`
-	Temperature      float64         `json:"temperature,omitempty"`
-	TopP             float64         `json:"top_p,omitempty"`
-	N                int             `json:"n,omitempty"`
-	Input            any             `json:"input,omitempty"`
-	Instruction      string          `json:"instruction,omitempty"`
-	Size             string          `json:"size,omitempty"`
-	Functions        any             `json:"functions,omitempty"`
+	Model            string          `json:"model,omitempty"`
 	FrequencyPenalty float64         `json:"frequency_penalty,omitempty"`
+	MaxTokens        int             `json:"max_tokens,omitempty"`
+	N                int             `json:"n,omitempty"`
 	PresencePenalty  float64         `json:"presence_penalty,omitempty"`
 	ResponseFormat   *ResponseFormat `json:"response_format,omitempty"`
 	Seed             float64         `json:"seed,omitempty"`
-	Tools            any             `json:"tools,omitempty"`
+	Stream           bool            `json:"stream,omitempty"`
+	Temperature      float64         `json:"temperature,omitempty"`
+	TopP             float64         `json:"top_p,omitempty"`
+	TopK             int             `json:"top_k,omitempty"`
+	Tools            []Tool          `json:"tools,omitempty"`
 	ToolChoice       any             `json:"tool_choice,omitempty"`
+	FunctionCall     any             `json:"function_call,omitempty"`
+	Functions        any             `json:"functions,omitempty"`
 	User             string          `json:"user,omitempty"`
+	Prompt           any             `json:"prompt,omitempty"`
+	Input            any             `json:"input,omitempty"`
+	Instruction      string          `json:"instruction,omitempty"`
+	Size             string          `json:"size,omitempty"`
 }
 
 func (r GeneralOpenAIRequest) ParseInput() []string {
diff --git a/relay/model/message.go b/relay/model/message.go
index c6c8a271..32a1055b 100644
--- a/relay/model/message.go
+++ b/relay/model/message.go
@@ -1,9 +1,10 @@
 package model
 
 type Message struct {
-	Role    string  `json:"role"`
-	Content any     `json:"content"`
-	Name    *string `json:"name,omitempty"`
+	Role      string  `json:"role,omitempty"`
+	Content   any     `json:"content,omitempty"`
+	Name      *string `json:"name,omitempty"`
+	ToolCalls []Tool  `json:"tool_calls,omitempty"`
 }
 
 func (m Message) IsStringContent() bool {
diff --git a/relay/model/tool.go b/relay/model/tool.go
new file mode 100644
index 00000000..253dca35
--- /dev/null
+++ b/relay/model/tool.go
@@ -0,0 +1,14 @@
+package model
+
+type Tool struct {
+	Id       string   `json:"id,omitempty"`
+	Type     string   `json:"type"`
+	Function Function `json:"function"`
+}
+
+type Function struct {
+	Description string `json:"description,omitempty"`
+	Name        string `json:"name"`
+	Parameters  any    `json:"parameters,omitempty"` // request
+	Arguments   any    `json:"arguments,omitempty"`  // response
+}