From 736018a0b071c48e6e5a13034e92694f301c0b0d Mon Sep 17 00:00:00 2001
From: Ben Vargas <ben@vargas.com>
Date: Thu, 23 Apr 2026 13:28:03 -0600
Subject: [PATCH] Add GPT-5.5 Codex model support

---
 internal/registry/model_definitions_test.go | 88 +++++++++++++++++++++
 internal/registry/models/models.json        | 16 ++--
 2 files changed, 96 insertions(+), 8 deletions(-)
 create mode 100644 internal/registry/model_definitions_test.go

diff --git a/internal/registry/model_definitions_test.go b/internal/registry/model_definitions_test.go
new file mode 100644
index 000000000..7a0630c28
--- /dev/null
+++ b/internal/registry/model_definitions_test.go
@@ -0,0 +1,88 @@
+package registry
+
+import "testing"
+
+func TestCodexStaticModelsIncludeGPT55(t *testing.T) {
+	tierModels := map[string][]*ModelInfo{
+		"free": GetCodexFreeModels(),
+		"team": GetCodexTeamModels(),
+		"plus": GetCodexPlusModels(),
+		"pro":  GetCodexProModels(),
+	}
+
+	for tier, models := range tierModels {
+		t.Run(tier, func(t *testing.T) {
+			model := findModelInfo(models, "gpt-5.5")
+			if model == nil {
+				t.Fatalf("expected codex %s tier to include gpt-5.5", tier)
+			}
+			assertGPT55ModelInfo(t, tier, model)
+		})
+	}
+
+	model := LookupStaticModelInfo("gpt-5.5")
+	if model == nil {
+		t.Fatal("expected LookupStaticModelInfo to find gpt-5.5")
+	}
+	assertGPT55ModelInfo(t, "lookup", model)
+}
+
+func findModelInfo(models []*ModelInfo, id string) *ModelInfo {
+	for _, model := range models {
+		if model != nil && model.ID == id {
+			return model
+		}
+	}
+	return nil
+}
+
+func assertGPT55ModelInfo(t *testing.T, source string, model *ModelInfo) {
+	t.Helper()
+
+	if model.ID != "gpt-5.5" {
+		t.Fatalf("%s id mismatch: got %q", source, model.ID)
+	}
+	if model.Object != "model" {
+		t.Fatalf("%s object mismatch: got %q", source, model.Object)
+	}
+	if model.Created != 1776902400 {
+		t.Fatalf("%s created timestamp mismatch: got %d", source, model.Created)
+	}
+	if model.OwnedBy != "openai" {
+		t.Fatalf("%s owned_by mismatch: got %q", source, model.OwnedBy)
+	}
+	if model.Type != "openai" {
+		t.Fatalf("%s type mismatch: got %q", source, model.Type)
+	}
+	if model.DisplayName != "GPT 5.5" {
+		t.Fatalf("%s display name mismatch: got %q", source, model.DisplayName)
+	}
+	if model.Version != "gpt-5.5" {
+		t.Fatalf("%s version mismatch: got %q", source, model.Version)
+	}
+	if model.Description != "Frontier model for complex coding, research, and real-world work." {
+		t.Fatalf("%s description mismatch: got %q", source, model.Description)
+	}
+	if model.ContextLength != 272000 {
+		t.Fatalf("%s context length mismatch: got %d", source, model.ContextLength)
+	}
+	if model.MaxCompletionTokens != 128000 {
+		t.Fatalf("%s max completion tokens mismatch: got %d", source, model.MaxCompletionTokens)
+	}
+	if len(model.SupportedParameters) != 1 || model.SupportedParameters[0] != "tools" {
+		t.Fatalf("%s supported parameters mismatch: got %v", source, model.SupportedParameters)
+	}
+	if model.Thinking == nil {
+		t.Fatalf("%s missing thinking support", source)
+	}
+
+	want := []string{"low", "medium", "high", "xhigh"}
+	if len(model.Thinking.Levels) != len(want) {
+		t.Fatalf("%s thinking level count mismatch: got %d, want %d", source, len(model.Thinking.Levels), len(want))
+	}
+	for i, level := range want {
+		if model.Thinking.Levels[i] != level {
+			t.Fatalf("%s thinking level %d mismatch: got %q, want %q", source, i, model.Thinking.Levels[i], level)
+		}
+	}
+}
diff --git a/internal/registry/models/models.json b/internal/registry/models/models.json
index f98579373..bf1d1bb1f 100644
--- a/internal/registry/models/models.json
+++ b/internal/registry/models/models.json
@@ -1301,8 +1301,8 @@
       "type": "openai",
       "display_name": "GPT 5.5",
       "version": "gpt-5.5",
-      "description": "Stable version of GPT 5.5",
-      "context_length": 1050000,
+      "description": "Frontier model for complex coding, research, and real-world work.",
+      "context_length": 272000,
       "max_completion_tokens": 128000,
       "supported_parameters": [
         "tools"
@@ -1419,8 +1419,8 @@
       "type": "openai",
       "display_name": "GPT 5.5",
       "version": "gpt-5.5",
-      "description": "Stable version of GPT 5.5",
-      "context_length": 1050000,
+      "description": "Frontier model for complex coding, research, and real-world work.",
+      "context_length": 272000,
       "max_completion_tokens": 128000,
       "supported_parameters": [
         "tools"
@@ -1560,8 +1560,8 @@
       "type": "openai",
       "display_name": "GPT 5.5",
       "version": "gpt-5.5",
-      "description": "Stable version of GPT 5.5",
-      "context_length": 1050000,
+      "description": "Frontier model for complex coding, research, and real-world work.",
+      "context_length": 272000,
       "max_completion_tokens": 128000,
       "supported_parameters": [
         "tools"
@@ -1701,8 +1701,8 @@
       "type": "openai",
       "display_name": "GPT 5.5",
       "version": "gpt-5.5",
-      "description": "Stable version of GPT 5.5",
-      "context_length": 1050000,
+      "description": "Frontier model for complex coding, research, and real-world work.",
+      "context_length": 272000,
       "max_completion_tokens": 128000,
       "supported_parameters": [
         "tools"