feat(registry): add supported endpoints for GitHub Copilot models

Enhance model definitions by including supported API endpoints for each model. This allows for better integration and usage tracking with the GitHub Copilot API.

internal/runtime/executor/github_copilot_executor.go

@@ -23,6 +23,7 @@ import (
 const (
 	githubCopilotBaseURL       = "https://api.githubcopilot.com"
 	githubCopilotChatPath      = "/chat/completions"
+	githubCopilotResponsesPath = "/responses"
 	githubCopilotAuthType      = "github-copilot"
 	githubCopilotTokenCacheTTL = 25 * time.Minute
 	// tokenExpiryBuffer is the time before expiry when we should refresh the token.
@@ -106,7 +107,11 @@ func (e *GitHubCopilotExecutor) Execute(ctx context.Context, auth *cliproxyauth.
 	defer reporter.trackFailure(ctx, &err)
 
 	from := opts.SourceFormat
+	useResponses := useGitHubCopilotResponsesEndpoint(from)
 	to := sdktranslator.FromString("openai")
+	if useResponses {
+		to = sdktranslator.FromString("openai-response")
+	}
 	originalPayload := bytes.Clone(req.Payload)
 	if len(opts.OriginalRequest) > 0 {
 		originalPayload = bytes.Clone(opts.OriginalRequest)
@@ -117,7 +122,11 @@ func (e *GitHubCopilotExecutor) Execute(ctx context.Context, auth *cliproxyauth.
 	body = applyPayloadConfigWithRoot(e.cfg, req.Model, to.String(), "", body, originalTranslated)
 	body, _ = sjson.SetBytes(body, "stream", false)
 
-	url := githubCopilotBaseURL + githubCopilotChatPath
+	path := githubCopilotChatPath
+	if useResponses {
+		path = githubCopilotResponsesPath
+	}
+	url := githubCopilotBaseURL + path
 	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
 	if err != nil {
 		return resp, err
@@ -172,6 +181,9 @@ func (e *GitHubCopilotExecutor) Execute(ctx context.Context, auth *cliproxyauth.
 	appendAPIResponseChunk(ctx, e.cfg, data)
 
 	detail := parseOpenAIUsage(data)
+	if useResponses && detail.TotalTokens == 0 {
+		detail = parseOpenAIResponsesUsage(data)
+	}
 	if detail.TotalTokens > 0 {
 		reporter.publish(ctx, detail)
 	}
@@ -194,7 +206,11 @@ func (e *GitHubCopilotExecutor) ExecuteStream(ctx context.Context, auth *cliprox
 	defer reporter.trackFailure(ctx, &err)
 
 	from := opts.SourceFormat
+	useResponses := useGitHubCopilotResponsesEndpoint(from)
 	to := sdktranslator.FromString("openai")
+	if useResponses {
+		to = sdktranslator.FromString("openai-response")
+	}
 	originalPayload := bytes.Clone(req.Payload)
 	if len(opts.OriginalRequest) > 0 {
 		originalPayload = bytes.Clone(opts.OriginalRequest)
@@ -205,9 +221,15 @@ func (e *GitHubCopilotExecutor) ExecuteStream(ctx context.Context, auth *cliprox
 	body = applyPayloadConfigWithRoot(e.cfg, req.Model, to.String(), "", body, originalTranslated)
 	body, _ = sjson.SetBytes(body, "stream", true)
 	// Enable stream options for usage stats in stream
-	body, _ = sjson.SetBytes(body, "stream_options.include_usage", true)
+	if !useResponses {
+		body, _ = sjson.SetBytes(body, "stream_options.include_usage", true)
+	}
 
-	url := githubCopilotBaseURL + githubCopilotChatPath
+	path := githubCopilotChatPath
+	if useResponses {
+		path = githubCopilotResponsesPath
+	}
+	url := githubCopilotBaseURL + path
 	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
 	if err != nil {
 		return nil, err
@@ -283,6 +305,10 @@ func (e *GitHubCopilotExecutor) ExecuteStream(ctx context.Context, auth *cliprox
 				}
 				if detail, ok := parseOpenAIStreamUsage(line); ok {
 					reporter.publish(ctx, detail)
+				} else if useResponses {
+					if detail, ok := parseOpenAIResponsesStreamUsage(line); ok {
+						reporter.publish(ctx, detail)
+					}
 				}
 			}
 
@@ -393,6 +419,10 @@ func (e *GitHubCopilotExecutor) normalizeModel(_ string, body []byte) []byte {
 	return body
 }
 
+func useGitHubCopilotResponsesEndpoint(sourceFormat sdktranslator.Format) bool {
+	return sourceFormat.String() == "openai-response"
+}
+
 // isHTTPSuccess checks if the status code indicates success (2xx).
 func isHTTPSuccess(statusCode int) bool {
 	return statusCode >= 200 && statusCode < 300

internal/runtime/executor/usage_helpers.go

@@ -236,6 +236,54 @@ func parseOpenAIStreamUsage(line []byte) (usage.Detail, bool) {
 	return detail, true
 }
 
+func parseOpenAIResponsesUsage(data []byte) usage.Detail {
+	usageNode := gjson.ParseBytes(data).Get("usage")
+	if !usageNode.Exists() {
+		return usage.Detail{}
+	}
+	detail := usage.Detail{
+		InputTokens:  usageNode.Get("input_tokens").Int(),
+		OutputTokens: usageNode.Get("output_tokens").Int(),
+		TotalTokens:  usageNode.Get("total_tokens").Int(),
+	}
+	if detail.TotalTokens == 0 {
+		detail.TotalTokens = detail.InputTokens + detail.OutputTokens
+	}
+	if cached := usageNode.Get("input_tokens_details.cached_tokens"); cached.Exists() {
+		detail.CachedTokens = cached.Int()
+	}
+	if reasoning := usageNode.Get("output_tokens_details.reasoning_tokens"); reasoning.Exists() {
+		detail.ReasoningTokens = reasoning.Int()
+	}
+	return detail
+}
+
+func parseOpenAIResponsesStreamUsage(line []byte) (usage.Detail, bool) {
+	payload := jsonPayload(line)
+	if len(payload) == 0 || !gjson.ValidBytes(payload) {
+		return usage.Detail{}, false
+	}
+	usageNode := gjson.GetBytes(payload, "usage")
+	if !usageNode.Exists() {
+		return usage.Detail{}, false
+	}
+	detail := usage.Detail{
+		InputTokens:  usageNode.Get("input_tokens").Int(),
+		OutputTokens: usageNode.Get("output_tokens").Int(),
+		TotalTokens:  usageNode.Get("total_tokens").Int(),
+	}
+	if detail.TotalTokens == 0 {
+		detail.TotalTokens = detail.InputTokens + detail.OutputTokens
+	}
+	if cached := usageNode.Get("input_tokens_details.cached_tokens"); cached.Exists() {
+		detail.CachedTokens = cached.Int()
+	}
+	if reasoning := usageNode.Get("output_tokens_details.reasoning_tokens"); reasoning.Exists() {
+		detail.ReasoningTokens = reasoning.Int()
+	}
+	return detail, true
+}
+
 func parseClaudeUsage(data []byte) usage.Detail {
 	usageNode := gjson.ParseBytes(data).Get("usage")
 	if !usageNode.Exists() {