fix(codex): keep gpt-5.5 out of free tier

Author: NGLSL

internal/registry/model_definitions.go

@@ -51,7 +51,7 @@ func GetAIStudioModels() []*ModelInfo {
 
 // GetCodexFreeModels returns model definitions for the Codex free plan tier.
 func GetCodexFreeModels() []*ModelInfo {
-	return WithCodexBuiltins(cloneModelInfos(getModels().CodexFree))
+	return upsertModelInfos(cloneModelInfos(getModels().CodexFree), codexBuiltinImageModelInfo())
 }
 
 // GetCodexTeamModels returns model definitions for the Codex team plan tier.
@@ -79,9 +79,9 @@ func GetAntigravityModels() []*ModelInfo {
 	return cloneModelInfos(getModels().Antigravity)
 }
 
-// WithCodexBuiltins injects hard-coded Codex-only model definitions that should
-// not depend on remote models.json updates. Built-ins replace any matching IDs
-// already present in the provided slice.
+// WithCodexBuiltins injects hard-coded Codex-only model definitions for paid
+// plan tiers that should not depend on remote models.json updates. Built-ins
+// replace any matching IDs already present in the provided slice.
 func WithCodexBuiltins(models []*ModelInfo) []*ModelInfo {
 	return upsertModelInfos(models, codexBuiltinImageModelInfo(), codexBuiltinGPT55ModelInfo())
 }

internal/registry/model_definitions_test.go

@@ -2,9 +2,15 @@ package registry
 
 import "testing"
 
-func TestCodexStaticModelsIncludeGPT55(t *testing.T) {
+func TestCodexFreeStaticModelsExcludeGPT55(t *testing.T) {
+	model := findModelInfo(GetCodexFreeModels(), "gpt-5.5")
+	if model != nil {
+		t.Fatalf("expected codex free tier to exclude gpt-5.5, got %q", model.ID)
+	}
+}
+
+func TestCodexPaidStaticModelsIncludeGPT55(t *testing.T) {
 	tierModels := map[string][]*ModelInfo{
-		"free": GetCodexFreeModels(),
 		"team": GetCodexTeamModels(),
 		"plus": GetCodexPlusModels(),
 		"pro":  GetCodexProModels(),