fix: claude model ratio (#449)

* fix: Claude model ratio

* chore: update implementation

---------

Co-authored-by: JustSong <songquanpeng@foxmail.com>

common/model-ratio.go

 package common
 
-import "encoding/json"
+import (
+	"encoding/json"
+	"strings"
+)
 
 // ModelRatio
 // https://platform.openai.com/docs/models/model-endpoint-compatibility
@@ -38,8 +41,8 @@ var ModelRatio = map[string]float64{
 	"text-moderation-stable":  0.1,
 	"text-moderation-latest":  0.1,
 	"dall-e":                  8,
-	"claude-instant-1":        0.75,
-	"claude-2":                30,
+	"claude-instant-1":        0.815,  // $1.63 / 1M tokens
+	"claude-2":                5.51,   // $11.02 / 1M tokens
 	"ERNIE-Bot":               0.8572, // ￥0.012 / 1k tokens
 	"ERNIE-Bot-turbo":         0.5715, // ￥0.008 / 1k tokens
 	"Embedding-V1":            0.1429, // ￥0.002 / 1k tokens
@@ -73,3 +76,19 @@ func GetModelRatio(name string) float64 {
 	}
 	return ratio
 }
+
+func GetCompletionRatio(name string) float64 {
+	if strings.HasPrefix(name, "gpt-3.5") {
+		return 1.333333
+	}
+	if strings.HasPrefix(name, "gpt-4") {
+		return 2
+	}
+	if strings.HasPrefix(name, "claude-instant-1") {
+		return 3.38
+	}
+	if strings.HasPrefix(name, "claude-2") {
+		return 2.965517
+	}
+	return 1
+}

controller/relay-text.go

@@ -326,14 +326,7 @@ func relayTextHelper(c *gin.Context, relayMode int) *OpenAIErrorWithStatusCode {
 		go func() {
 			if consumeQuota {
 				quota := 0
-				completionRatio := 1.0
-				if strings.HasPrefix(textRequest.Model, "gpt-3.5") {
-					completionRatio = 1.333333
-				}
-				if strings.HasPrefix(textRequest.Model, "gpt-4") {
-					completionRatio = 2
-				}
-
+				completionRatio := common.GetCompletionRatio(textRequest.Model)
 				promptTokens = textResponse.Usage.PromptTokens
 				completionTokens = textResponse.Usage.CompletionTokens