diff --git a/packages/ai/test/anthropic-adaptive-thinking-models.test.ts b/packages/ai/test/anthropic-adaptive-thinking-models.test.ts
deleted file mode 100644
index a3a1c4414..000000000
--- a/packages/ai/test/anthropic-adaptive-thinking-models.test.ts
+++ /dev/null
@@ -1,50 +0,0 @@
-import { describe, expect, it } from "vitest";
-import { getModels, getProviders } from "../src/compat.ts";
-import type { Api, Model } from "../src/types.ts";
-
-const EXPECTED_CURRENT_ADAPTIVE_THINKING_MODELS = [
-	"anthropic/claude-fable-5",
-	"anthropic/claude-haiku-5-5",
-	"anthropic/claude-opus-4-8",
-	"anthropic/claude-opus-5",
-	"anthropic/claude-sonnet-5",
-	"cloudflare-ai-gateway/claude-fable-5",
-	"fireworks/accounts/fireworks/models/deepseek-v4p1-flash",
-	"fireworks/accounts/fireworks/models/gpt-oss-120b",
-	"fireworks/accounts/fireworks/models/qwen3p8-max",
-	"minimax-cn/MiniMax-M3.1-Flash",
-	"minimax/MiniMax-M3.1-Flash",
-	"opencode/claude-opus-4-8",
-	"opencode/claude-opus-5",
-	"vercel-ai-gateway/anthropic/claude-opus-4.8",
-	"vercel-ai-gateway/anthropic/claude-opus-5",
-	"vercel-ai-gateway/anthropic/claude-sonnet-5",
-];
-
-function getAllModels(): Model<Api>[] {
-	return getProviders().flatMap((provider) => getModels(provider) as Model<Api>[]);
-}
-
-describe("Anthropic adaptive thinking model metadata", () => {
-	it("marks built-in Anthropic Messages models that use adaptive thinking", () => {
-		const flaggedModels = getAllModels()
-			.filter((model): model is Model<"anthropic-messages"> => model.api === "anthropic-messages")
-			.filter((model) => model.compat?.forceAdaptiveThinking === true)
-			.map((model) => `${model.provider}/${model.id}`)
-			.sort();
-
-		expect(flaggedModels).toEqual(expect.arrayContaining([...EXPECTED_CURRENT_ADAPTIVE_THINKING_MODELS].sort()));
-		expect(flaggedModels).toEqual(
-			flaggedModels.filter(
-				(modelId) =>
-					// Regression for #9323: Fireworks uses catalog effort metadata and
-					// verified fallbacks, not a fixed set of adaptive model names.
-					modelId.startsWith("fireworks/") ||
-					// #11121: MiniMax models with catalog effort levels require adaptive thinking.
-					modelId.startsWith("minimax/") ||
-					modelId.startsWith("minimax-cn/") ||
-					/(opus[-.](4[-.][678]|5)|sonnet[-.]4[-.]6|sonnet[-.]5|haiku[-.]5[-.]5|fable[-.]5)/.test(modelId),
-			),
-		);
-	});
-});