From bd09c0bf09f10ccad7ee45ba1dd4aed1eef3d770 Mon Sep 17 00:00:00 2001
From: Thai Nguyen Hung <hungthai1401.it@gmail.com>
Date: Wed, 1 Apr 2026 10:04:38 +0700
Subject: [PATCH] feat(registry): add gpt-5.4-mini model to GitHub Copilot
 registry

---
 internal/registry/model_definitions.go        | 13 ++++++++++++
 .../executor/github_copilot_executor_test.go  | 21 +++++++++++++++----
 2 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/internal/registry/model_definitions.go b/internal/registry/model_definitions.go
index 9299ca22..f074316c 100644
--- a/internal/registry/model_definitions.go
+++ b/internal/registry/model_definitions.go
@@ -477,6 +477,19 @@ func GetGitHubCopilotModels() []*ModelInfo {
 			SupportedEndpoints:  []string{"/responses"},
 			Thinking:            &ThinkingSupport{Levels: []string{"none", "low", "medium", "high", "xhigh"}},
 		},
+		{
+			ID:                  "gpt-5.4-mini",
+			Object:              "model",
+			Created:             now,
+			OwnedBy:             "github-copilot",
+			Type:                "github-copilot",
+			DisplayName:         "GPT-5.4 mini",
+			Description:         "OpenAI GPT-5.4 mini via GitHub Copilot",
+			ContextLength:       200000,
+			MaxCompletionTokens: 32768,
+			SupportedEndpoints:  []string{"/responses"},
+			Thinking:            &ThinkingSupport{Levels: []string{"none", "low", "medium", "high", "xhigh"}},
+		},
 		{
 			ID:                  "claude-haiku-4.5",
 			Object:              "model",
diff --git a/internal/runtime/executor/github_copilot_executor_test.go b/internal/runtime/executor/github_copilot_executor_test.go
index dfc332f2..c320bccc 100644
--- a/internal/runtime/executor/github_copilot_executor_test.go
+++ b/internal/runtime/executor/github_copilot_executor_test.go
@@ -76,6 +76,9 @@ func TestUseGitHubCopilotResponsesEndpoint_RegistryResponsesOnlyModel(t *testing
 	if !useGitHubCopilotResponsesEndpoint(sdktranslator.FromString("openai"), "gpt-5.4") {
 		t.Fatal("expected responses-only registry model to use /responses")
 	}
+	if !useGitHubCopilotResponsesEndpoint(sdktranslator.FromString("openai"), "gpt-5.4-mini") {
+		t.Fatal("expected responses-only registry model to use /responses")
+	}
 }
 
 func TestUseGitHubCopilotResponsesEndpoint_DynamicRegistryWinsOverStatic(t *testing.T) {
@@ -83,15 +86,25 @@ func TestUseGitHubCopilotResponsesEndpoint_DynamicRegistryWinsOverStatic(t *test
 
 	reg := registry.GetGlobalRegistry()
 	clientID := "github-copilot-test-client"
-	reg.RegisterClient(clientID, "github-copilot", []*registry.ModelInfo{{
-		ID:                 "gpt-5.4",
-		SupportedEndpoints: []string{"/chat/completions", "/responses"},
-	}})
+	reg.RegisterClient(clientID, "github-copilot", []*registry.ModelInfo{
+		{
+			ID:                 "gpt-5.4",
+			SupportedEndpoints: []string{"/chat/completions", "/responses"},
+		},
+		{
+			ID:                 "gpt-5.4-mini",
+			SupportedEndpoints: []string{"/chat/completions", "/responses"},
+		},
+	})
 	defer reg.UnregisterClient(clientID)
 
 	if useGitHubCopilotResponsesEndpoint(sdktranslator.FromString("openai"), "gpt-5.4") {
 		t.Fatal("expected dynamic registry definition to take precedence over static fallback")
 	}
+
+	if useGitHubCopilotResponsesEndpoint(sdktranslator.FromString("openai"), "gpt-5.4-mini") {
+		t.Fatal("expected dynamic registry definition to take precedence over static fallback")
+	}
 }
 
 func TestUseGitHubCopilotResponsesEndpoint_DefaultChat(t *testing.T) {