feat: support gemini-2.0-flash

relay/adaptor/gemini/adaptor.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"strings"
 
 	"github.com/gin-gonic/gin"
 	"github.com/pkg/errors"
@@ -24,13 +25,9 @@ func (a *Adaptor) Init(meta *meta.Meta) {
 }
 
 func (a *Adaptor) GetRequestURL(meta *meta.Meta) (string, error) {
-	var defaultVersion string
-	switch meta.ActualModelName {
-	case "gemini-2.0-flash-exp",
-		"gemini-2.0-flash-thinking-exp-01-21":
+	defaultVersion := config.GeminiVersion
+	if strings.Contains(meta.ActualModelName, "-2.0") {
 		defaultVersion = "v1beta"
-	default:
-		defaultVersion = config.GeminiVersion
 	}
 
 	version := helper.AssignOrDefault(meta.Config.APIVersion, defaultVersion)

relay/adaptor/gemini/constants.go

@@ -4,8 +4,12 @@ package gemini
 
 var ModelList = []string{
 	"gemini-pro", "gemini-1.0-pro",
-	"gemini-1.5-flash", "gemini-1.5-pro",
+	// "gemma-2-2b-it", "gemma-2-9b-it", "gemma-2-27b-it",
+	"gemini-1.5-flash", "gemini-1.5-flash-8b",
+	"gemini-1.5-pro", "gemini-1.5-pro-experimental",
 	"text-embedding-004", "aqa",
-	"gemini-2.0-flash-exp",
+	"gemini-2.0-pro-exp-02-05",
+	"gemini-2.0-flash", "gemini-2.0-flash-exp",
+	"gemini-2.0-flash-lite-preview-02-05",
 	"gemini-2.0-flash-thinking-exp-01-21",
 }

relay/adaptor/gemini/main.go

@@ -160,6 +160,15 @@ func ConvertRequest(textRequest model.GeneralOpenAIRequest) *ChatRequest {
 		geminiRequest.Contents = append(geminiRequest.Contents, content)
 	}
 
+	// As of 2025-02-06, the newly released gemini 2.0 models do not support system_instruction,
+	// which can reasonably be considered a bug. Google may fix this issue in the future.
+	if geminiRequest.SystemInstruction != nil &&
+		strings.Contains(textRequest.Model, "-2.0") &&
+		textRequest.Model != "gemini-2.0-flash-exp" &&
+		textRequest.Model != "gemini-2.0-flash-thinking-exp-01-21" {
+		geminiRequest.SystemInstruction = nil
+	}
+
 	return &geminiRequest
 }