feat: add GLM-4.6 model support to Z.AI provider

- Add glm-4.6 model to both international and mainland Z.AI configurations
- Update model to GLM-4.6 as default for both regions
- Configure 200K context window (upgraded from 131K in GLM-4.5)
- Add tiered pricing for mainland China (32K, 128K, 200K+ contexts)
- Support 355B-parameter MoE architecture with improved capabilities
- Enable prompt caching support for cost optimization

GLM-4.6 represents Zhipu's latest SOTA model with significant
improvements in coding, reasoning, search, writing, and agent
applications across 8 authoritative benchmarks.

Author: ooyama777

packages/types/src/providers/zai.ts

@@ -2,12 +2,24 @@ import type { ModelInfo } from "../model.js"
 import { ZaiApiLine } from "../provider-settings.js"
 
 // Z AI
-// https://docs.z.ai/guides/llm/glm-4.5
+// https://docs.z.ai/guides/llm/glm-4.6
 // https://docs.z.ai/guides/overview/pricing
 
 export type InternationalZAiModelId = keyof typeof internationalZAiModels
-export const internationalZAiDefaultModelId: InternationalZAiModelId = "glm-4.5"
+export const internationalZAiDefaultModelId: InternationalZAiModelId = "glm-4.6"
 export const internationalZAiModels = {
+	"glm-4.6": {
+		maxTokens: 98_304,
+		contextWindow: 200_000,
+		supportsImages: false,
+		supportsPromptCache: true,
+		inputPrice: 0.6,
+		outputPrice: 2.2,
+		cacheWritesPrice: 0,
+		cacheReadsPrice: 0.11,
+		description:
+			"GLM-4.6 is Zhipu's latest SOTA models for reasoning, code, and agentsUpgraded across 8 authoritative benchmarks. With a 355B-parameter MoE architecture and 200K context, it surpasses GLM-4.5 in coding, reasoning, search, writing, and agent applications.",
+	},
 	"glm-4.5": {
 		maxTokens: 98_304,
 		contextWindow: 131_072,
@@ -18,7 +30,7 @@ export const internationalZAiModels = {
 		cacheWritesPrice: 0,
 		cacheReadsPrice: 0.11,
 		description:
-			"GLM-4.5 is Zhipu's latest featured model. Its comprehensive capabilities in reasoning, coding, and agent reach the state-of-the-art (SOTA) level among open-source models, with a context length of up to 128k.",
+			"GLM-4.5 is Zhipu's previous flagship model. Its comprehensive capabilities in reasoning, coding, and agent are excellent among open-source models, with a context length of up to 128k.",
 	},
 	"glm-4.5-air": {
 		maxTokens: 98_304,
@@ -35,8 +47,40 @@ export const internationalZAiModels = {
 } as const satisfies Record<string, ModelInfo>
 
 export type MainlandZAiModelId = keyof typeof mainlandZAiModels
-export const mainlandZAiDefaultModelId: MainlandZAiModelId = "glm-4.5"
+export const mainlandZAiDefaultModelId: MainlandZAiModelId = "glm-4.6"
 export const mainlandZAiModels = {
+	"glm-4.6": {
+		maxTokens: 98_304,
+		contextWindow: 200_000,
+		supportsImages: false,
+		supportsPromptCache: true,
+		inputPrice: 0.29,
+		outputPrice: 1.14,
+		cacheWritesPrice: 0,
+		cacheReadsPrice: 0.057,
+		description:
+			"GLM-4.6 is Zhipu's latest SOTA models for reasoning, code, and agentsUpgraded across 8 authoritative benchmarks. With a 355B-parameter MoE architecture and 200K context, it surpasses GLM-4.5 in coding, reasoning, search, writing, and agent applications.",
+		tiers: [
+			{
+				contextWindow: 32_000,
+				inputPrice: 0.21,
+				outputPrice: 1.0,
+				cacheReadsPrice: 0.043,
+			},
+			{
+				contextWindow: 128_000,
+				inputPrice: 0.29,
+				outputPrice: 1.14,
+				cacheReadsPrice: 0.057,
+			},
+			{
+				contextWindow: Infinity,
+				inputPrice: 0.29,
+				outputPrice: 1.14,
+				cacheReadsPrice: 0.057,
+			},
+		],
+	},
 	"glm-4.5": {
 		maxTokens: 98_304,
 		contextWindow: 131_072,
@@ -47,7 +91,7 @@ export const mainlandZAiModels = {
 		cacheWritesPrice: 0,
 		cacheReadsPrice: 0.057,
 		description:
-			"GLM-4.5 is Zhipu's latest featured model. Its comprehensive capabilities in reasoning, coding, and agent reach the state-of-the-art (SOTA) level among open-source models, with a context length of up to 128k.",
+			"GLM-4.5 is Zhipu's previous flagship model. Its comprehensive capabilities in reasoning, coding, and agent are excellent among open-source models, with a context length of up to 128k.",
 		tiers: [
 			{
 				contextWindow: 32_000,