feat: add missing Vertex AI models and us-south1 region

- Added gpt-oss-120b-maas model
- Added gpt-oss-20b-maas model
- Added deepseek-r1-0528-maas model
- Added deepseek-v3.1-maas model
- Added qwen3-coder-480b-a35b-instruct-maas model
- Added qwen3-235b-a22b-instruct-2507-maas model
- Added us-south1 to VERTEX_REGIONS for qwen models support

Fixes #7725

Author: roomote

packages/types/src/providers/vertex.ts

@@ -294,6 +294,60 @@ export const vertexModels = {
 		outputPrice: 1.15,
 		description: "Meta Llama 4 Maverick 17B Instruct model, 128K context.",
 	},
+	"gpt-oss-120b-maas": {
+		maxTokens: 8192,
+		contextWindow: 128_000,
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 2.0,
+		outputPrice: 8.0,
+		description: "GPT OSS 120B model via Model-as-a-Service.",
+	},
+	"gpt-oss-20b-maas": {
+		maxTokens: 8192,
+		contextWindow: 128_000,
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 0.5,
+		outputPrice: 2.0,
+		description: "GPT OSS 20B model via Model-as-a-Service.",
+	},
+	"deepseek-r1-0528-maas": {
+		maxTokens: 8192,
+		contextWindow: 128_000,
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 1.0,
+		outputPrice: 4.0,
+		description: "DeepSeek R1 0528 model via Model-as-a-Service.",
+	},
+	"deepseek-v3.1-maas": {
+		maxTokens: 8192,
+		contextWindow: 128_000,
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 0.8,
+		outputPrice: 3.2,
+		description: "DeepSeek V3.1 model via Model-as-a-Service.",
+	},
+	"qwen3-coder-480b-a35b-instruct-maas": {
+		maxTokens: 8192,
+		contextWindow: 128_000,
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 3.0,
+		outputPrice: 12.0,
+		description: "Qwen3 Coder 480B Instruct model via Model-as-a-Service.",
+	},
+	"qwen3-235b-a22b-instruct-2507-maas": {
+		maxTokens: 8192,
+		contextWindow: 128_000,
+		supportsImages: false,
+		supportsPromptCache: false,
+		inputPrice: 2.5,
+		outputPrice: 10.0,
+		description: "Qwen3 235B Instruct model via Model-as-a-Service.",
+	},
 } as const satisfies Record<string, ModelInfo>
 
 export const VERTEX_REGIONS = [
@@ -306,6 +360,7 @@ export const VERTEX_REGIONS = [
 	{ value: "us-west2", label: "us-west2" },
 	{ value: "us-west3", label: "us-west3" },
 	{ value: "us-west4", label: "us-west4" },
+	{ value: "us-south1", label: "us-south1" },
 	{ value: "northamerica-northeast1", label: "northamerica-northeast1" },
 	{ value: "northamerica-northeast2", label: "northamerica-northeast2" },
 	{ value: "southamerica-east1", label: "southamerica-east1" },