Add gpt4o (#742)

* Add gpt4o

* disabled model for endpoint

seen in e0d0801ac7

* Update completion.go

---------

Co-authored-by: Alexander Baranov <677093+sashabaranov@users.noreply.github.com>

completion.go

@@ -84,6 +84,8 @@ var disabledModelsForEndpoints = map[string]map[string]bool{
 		GPT3Dot5Turbo16K:     true,
 		GPT3Dot5Turbo16K0613: true,
 		GPT4:                 true,
+		GPT4o:                true,
+		GPT4o20240513:        true,
 		GPT4TurboPreview:     true,
 		GPT4VisionPreview:    true,
 		GPT4Turbo1106:        true,