From dab99531e42b7cadea62e8f9cee67adacc61a480 Mon Sep 17 00:00:00 2001
From: YeonGyu-Kim <code.yeon.gyu@gmail.com>
Date: Tue, 17 Feb 2026 01:27:10 +0900
Subject: [PATCH] fix: handle all model versions in normalizeModelName for
 fallback chains (#1679)

---
 src/shared/model-availability.test.ts | 21 +++++++++++++++++++++
 src/shared/model-availability.ts      |  3 +--
 src/shared/model-name-matcher.ts      |  4 +---
 3 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/src/shared/model-availability.test.ts b/src/shared/model-availability.test.ts
index cbaed0f5c..7ef44c55d 100644
--- a/src/shared/model-availability.test.ts
+++ b/src/shared/model-availability.test.ts
@@ -233,6 +233,27 @@ describe("fuzzyMatchModel", () => {
 		expect(result).toBe("anthropic/claude-opus-4-6")
 	})
 
+	// given github-copilot serves claude versions with dot notation
+	// when fallback chain uses hyphen notation in requested model
+	// then normalize both forms and match github-copilot model
+	it("should match github-copilot claude-opus-4-6 to claude-opus-4.6", () => {
+		const available = new Set([
+			"github-copilot/claude-opus-4.6",
+			"opencode/glm-4.7-free",
+		])
+		const result = fuzzyMatchModel("claude-opus-4-6", available, ["github-copilot"])
+		expect(result).toBe("github-copilot/claude-opus-4.6")
+	})
+
+	// given claude models can evolve to newer version numbers
+	// when matching across dot and hyphen version separators
+	// then normalize generically without hardcoding specific versions
+	it("should normalize claude version separators for future versions", () => {
+		const available = new Set(["github-copilot/claude-sonnet-5.1"])
+		const result = fuzzyMatchModel("claude-sonnet-5-1", available, ["github-copilot"])
+		expect(result).toBe("github-copilot/claude-sonnet-5.1")
+	})
+
 	// given available models from multiple providers
 	// when providers filter is specified
 	// then only search models from specified providers
diff --git a/src/shared/model-availability.ts b/src/shared/model-availability.ts
index 0943ce857..940f955b8 100644
--- a/src/shared/model-availability.ts
+++ b/src/shared/model-availability.ts
@@ -28,8 +28,7 @@ import { normalizeSDKResponse } from "./normalize-sdk-response"
 function normalizeModelName(name: string): string {
 	return name
 		.toLowerCase()
-		.replace(/claude-(opus|sonnet|haiku)-4-5/g, "claude-$1-4.5")
-		.replace(/claude-(opus|sonnet|haiku)-4\.5/g, "claude-$1-4.5")
+		.replace(/claude-(opus|sonnet|haiku)-(\d+)[.-](\d+)/g, "claude-$1-$2.$3")
 }
 
 export function fuzzyMatchModel(
diff --git a/src/shared/model-name-matcher.ts b/src/shared/model-name-matcher.ts
index dc10289df..bcdd3fb41 100644
--- a/src/shared/model-name-matcher.ts
+++ b/src/shared/model-name-matcher.ts
@@ -3,8 +3,7 @@ import { log } from "./logger"
 function normalizeModelName(name: string): string {
 	return name
 		.toLowerCase()
-		.replace(/claude-(opus|sonnet|haiku)-4-5/g, "claude-$1-4.5")
-		.replace(/claude-(opus|sonnet|haiku)-4\.5/g, "claude-$1-4.5")
+		.replace(/claude-(opus|sonnet|haiku)-(\d+)[.-](\d+)/g, "claude-$1-$2.$3")
 }
 
 export function fuzzyMatchModel(
@@ -82,4 +81,3 @@ export function fuzzyMatchModel(
 	log("[fuzzyMatchModel] shortest match", { result })
 	return result
 }
-