From fcb0293c0d5c83b269509dfce368ff5790fc8543 Mon Sep 17 00:00:00 2001
From: Jeff Nash <9919536+jeffnash@users.noreply.github.com>
Date: Fri, 7 Nov 2025 16:54:28 -0800
Subject: [PATCH] feat(registry): add GPT-5 Codex Mini model variants

Adds three new Codex Mini model variants (mini, mini-medium, mini-high)
that map to codex-mini-latest. Codex Mini supports medium and high
reasoning effort levels only (no low/minimal). Base model defaults to
medium reasoning effort.
---
 internal/registry/model_definitions.go      | 40 +++++++++++++++++----
 internal/runtime/executor/codex_executor.go | 27 ++++++++++++++
 2 files changed, 60 insertions(+), 7 deletions(-)

diff --git a/internal/registry/model_definitions.go b/internal/registry/model_definitions.go
index ce662131..a5120d2d 100644
--- a/internal/registry/model_definitions.go
+++ b/internal/registry/model_definitions.go
@@ -352,17 +352,43 @@ func GetOpenAIModels() []*ModelInfo {
 			SupportedParameters: []string{"tools"},
 		},
 		{
-			ID:                  "codex-mini-latest",
+			ID:                  "gpt-5-codex-mini",
 			Object:              "model",
 			Created:             time.Now().Unix(),
 			OwnedBy:             "openai",
 			Type:                "openai",
-			Version:             "1.0",
-			DisplayName:         "Codex Mini",
-			Description:         "Lightweight code generation model",
-			ContextLength:       4096,
-			MaxCompletionTokens: 2048,
-			SupportedParameters: []string{"temperature", "max_tokens", "stream", "stop"},
+			Version:             "gpt-5-2025-11-07",
+			DisplayName:         "GPT 5 Codex Mini",
+			Description:         "Stable version of GPT 5 Codex Mini: cheaper, faster, but less capable version of GPT 5 Codex.",
+			ContextLength:       400000,
+			MaxCompletionTokens: 128000,
+			SupportedParameters: []string{"tools"},
+		},
+		{
+			ID:                  "gpt-5-codex-mini-medium",
+			Object:              "model",
+			Created:             time.Now().Unix(),
+			OwnedBy:             "openai",
+			Type:                "openai",
+			Version:             "gpt-5-2025-11-07",
+			DisplayName:         "GPT 5 Codex Mini Medium",
+			Description:         "Stable version of GPT 5 Codex Mini: cheaper, faster, but less capable version of GPT 5 Codex.",
+			ContextLength:       400000,
+			MaxCompletionTokens: 128000,
+			SupportedParameters: []string{"tools"},
+		},
+		{
+			ID:                  "gpt-5-codex-mini-high",
+			Object:              "model",
+			Created:             time.Now().Unix(),
+			OwnedBy:             "openai",
+			Type:                "openai",
+			Version:             "gpt-5-2025-11-07",
+			DisplayName:         "GPT 5 Codex Mini High",
+			Description:         "Stable version of GPT 5 Codex Mini: cheaper, faster, but less capable version of GPT 5 Codex.",
+			ContextLength:       400000,
+			MaxCompletionTokens: 128000,
+			SupportedParameters: []string{"tools"},
 		},
 	}
 }
diff --git a/internal/runtime/executor/codex_executor.go b/internal/runtime/executor/codex_executor.go
index 443e41e7..4297795c 100644
--- a/internal/runtime/executor/codex_executor.go
+++ b/internal/runtime/executor/codex_executor.go
@@ -75,6 +75,14 @@ func (e *CodexExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, re
 		case "gpt-5-codex-high":
 			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
 		}
+	} else if util.InArray([]string{"gpt-5-codex-mini", "gpt-5-codex-mini-medium", "gpt-5-codex-mini-high"}, req.Model) {
+		body, _ = sjson.SetBytes(body, "model", "codex-mini-latest")
+		switch req.Model {
+		case "gpt-5-codex-mini-medium":
+			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
+		case "gpt-5-codex-mini-high":
+			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
+		}
 	}
 
 	body, _ = sjson.SetBytes(body, "stream", true)
@@ -188,6 +196,14 @@ func (e *CodexExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.Au
 		case "gpt-5-codex-high":
 			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
 		}
+	} else if util.InArray([]string{"gpt-5-codex-mini", "gpt-5-codex-mini-medium", "gpt-5-codex-mini-high"}, req.Model) {
+		body, _ = sjson.SetBytes(body, "model", "codex-mini-latest")
+		switch req.Model {
+		case "gpt-5-codex-mini-medium":
+			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
+		case "gpt-5-codex-mini-high":
+			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
+		}
 	}
 
 	body, _ = sjson.DeleteBytes(body, "previous_response_id")
@@ -312,6 +328,17 @@ func (e *CodexExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Auth
 		default:
 			body, _ = sjson.SetBytes(body, "reasoning.effort", "low")
 		}
+	} else if util.InArray([]string{"gpt-5-codex-mini", "gpt-5-codex-mini-medium", "gpt-5-codex-mini-high"}, req.Model) {
+		modelForCounting = "gpt-5"
+		body, _ = sjson.SetBytes(body, "model", "codex-mini-latest")
+		switch req.Model {
+		case "gpt-5-codex-mini-medium":
+			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
+		case "gpt-5-codex-mini-high":
+			body, _ = sjson.SetBytes(body, "reasoning.effort", "high")
+		default:
+			body, _ = sjson.SetBytes(body, "reasoning.effort", "medium")
+		}
 	}
 
 	body, _ = sjson.DeleteBytes(body, "previous_response_id")