Add Prediction field (#970)

* Add Prediction field to ChatCompletionRequest

* Include prediction tokens in response

chat.go

@@ -273,6 +273,8 @@ type ChatCompletionRequest struct {
 	ReasoningEffort string `json:"reasoning_effort,omitempty"`
 	// Metadata to store with the completion.
 	Metadata map[string]string `json:"metadata,omitempty"`
+	// Configuration for a predicted output.
+	Prediction *Prediction `json:"prediction,omitempty"`
 }
 
 type StreamOptions struct {
@@ -340,6 +342,11 @@ type LogProbs struct {
 	Content []LogProb `json:"content"`
 }
 
+type Prediction struct {
+	Content string `json:"content"`
+	Type    string `json:"type"`
+}
+
 type FinishReason string
 
 const (

common.go

@@ -15,6 +15,8 @@ type Usage struct {
 type CompletionTokensDetails struct {
 	AudioTokens              int `json:"audio_tokens"`
 	ReasoningTokens          int `json:"reasoning_tokens"`
+	AcceptedPredictionTokens int `json:"accepted_prediction_tokens"`
+	RejectedPredictionTokens int `json:"rejected_prediction_tokens"`
 }
 
 // PromptTokensDetails Breakdown of tokens used in the prompt.