From a2eef9eb60fb44bf399532151b43dab83c0a9c88 Mon Sep 17 00:00:00 2001
From: Armin Ronacher <armin.ronacher@active-4.com>
Date: Wed, 7 Oct 2026 22:41:41 +0200
Subject: [PATCH] fix(ai): pin Kimi K3 Moonshot pricing and expect Haiku 5.5
 adaptive thinking

models.dev now lists the input rate as Kimi K3's cache write cost on Moonshot, which does not bill cache writes. Claude Haiku 5.5 uses adaptive thinking, so the metadata test now expects it.
---
 packages/ai/scripts/generate-models.ts            | 15 +++++++++------
 .../anthropic-adaptive-thinking-models.test.ts    |  5 ++++-
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/packages/ai/scripts/generate-models.ts b/packages/ai/scripts/generate-models.ts
index 3599bce6c..9163028c4 100644
--- a/packages/ai/scripts/generate-models.ts
+++ b/packages/ai/scripts/generate-models.ts
@@ -2433,12 +2433,15 @@ async function loadModelsDevData(): Promise<Model<any>[]> {
 					baseUrl,
 					reasoning: isKimiK3 || m.reasoning === true,
 					input: m.modalities?.input?.includes("image") ? ["text", "image"] : ["text"],
-					cost: {
-						input: m.cost?.input || (isKimiK3 ? KIMI_K3_COST.input : 0),
-						output: m.cost?.output || (isKimiK3 ? KIMI_K3_COST.output : 0),
-						cacheRead: m.cost?.cache_read || (isKimiK3 ? KIMI_K3_COST.cacheRead : 0),
-						cacheWrite: m.cost?.cache_write || (isKimiK3 ? KIMI_K3_COST.cacheWrite : 0),
-					},
+					// Moonshot does not bill cache writes; models.dev lists the input rate as cache_write for Kimi K3.
+					cost: isKimiK3
+						? { ...KIMI_K3_COST }
+						: {
+								input: m.cost?.input || 0,
+								output: m.cost?.output || 0,
+								cacheRead: m.cost?.cache_read || 0,
+								cacheWrite: m.cost?.cache_write || 0,
+							},
 					contextWindow: m.limit?.context || 4096,
 					maxTokens: m.limit?.output || 4096,
 					compat,
diff --git a/packages/ai/test/anthropic-adaptive-thinking-models.test.ts b/packages/ai/test/anthropic-adaptive-thinking-models.test.ts
index 1b1be72dc..9efa7de35 100644
--- a/packages/ai/test/anthropic-adaptive-thinking-models.test.ts
+++ b/packages/ai/test/anthropic-adaptive-thinking-models.test.ts
@@ -4,6 +4,7 @@ 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",
@@ -40,7 +41,9 @@ describe("Anthropic adaptive thinking model metadata", () => {
 					// Regression for #9323: Fireworks uses catalog effort metadata and
 					// verified fallbacks, not a fixed set of adaptive model names.
 					modelId.startsWith("fireworks/") ||
-					/(opus[-.](4[-.][678]|5)|sonnet[-.]4[-.]6|sonnet[-.]5|fable[-.]5|kimi-coding\/)/.test(modelId),
+					/(opus[-.](4[-.][678]|5)|sonnet[-.]4[-.]6|sonnet[-.]5|haiku[-.]5[-.]5|fable[-.]5|kimi-coding\/)/.test(
+						modelId,
+					),
 			),
 		);
 	});