fix(ai): avoid duplicate OpenCode DeepSeek reasoning controls

closes #5818

packages/ai/CHANGELOG.md

@@ -9,6 +9,7 @@
 ### Fixed
 
 - Fixed OpenAI Responses streaming to tolerate null message content from OpenAI-compatible servers before tool calls ([#5819](https://github.com/earendil-works/pi/issues/5819)).
+- Fixed OpenCode DeepSeek V4 thinking requests to avoid sending both `thinking` and `reasoning_effort` ([#5818](https://github.com/earendil-works/pi/issues/5818)).
 - Fixed Z.AI GLM-5.2 thinking requests to send `reasoning_effort` with the provider's `high`/`max` effort mapping ([#5770](https://github.com/earendil-works/pi/issues/5770)).
 - Fixed Google and `google-vertex` Gemini model metadata to map `latest` aliases to the current models, add Gemini 3.5 Flash for Vertex, correct Gemini 2.5 Flash Vertex cache pricing, and remove shut-down Vertex preview models ([#5761](https://github.com/earendil-works/pi/issues/5761)).
 - Fixed Moonshot AI China model metadata to include Kimi K2.7 Code, and omitted unsupported thinking-off payloads for Kimi K2.7 Code models ([#5760](https://github.com/earendil-works/pi/issues/5760)).

packages/ai/scripts/generate-models.ts

@@ -1852,9 +1852,13 @@ async function generateModels() {
 
 	for (const candidate of allModels) {
 		if (candidate.api === "openai-completions" && candidate.id.includes("deepseek-v4")) {
+			const preservesNativeReasoningEffort =
+				candidate.provider === "openrouter" ||
+				candidate.provider === "opencode" ||
+				candidate.provider === "opencode-go";
 			candidate.compat = {
 				...candidate.compat,
-				...(candidate.provider === "openrouter"
+				...(preservesNativeReasoningEffort
 					? {
 							requiresReasoningContentOnAssistantMessages:
 								deepseekCompat.requiresReasoningContentOnAssistantMessages,

packages/ai/src/models.generated.ts

@@ -7938,7 +7938,7 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "opencode",
 			baseUrl: "https://opencode.ai/zen/v1",
-			compat: {"maxTokensField":"max_tokens","supportsLongCacheRetention":false,"requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"maxTokensField":"max_tokens","supportsLongCacheRetention":false,"requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
 			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
 			input: ["text"],
@@ -7957,7 +7957,7 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "opencode",
 			baseUrl: "https://opencode.ai/zen/v1",
-			compat: {"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
 			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
 			input: ["text"],
@@ -7976,7 +7976,7 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "opencode",
 			baseUrl: "https://opencode.ai/zen/v1",
-			compat: {"maxTokensField":"max_tokens","supportsLongCacheRetention":false,"requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"maxTokensField":"max_tokens","supportsLongCacheRetention":false,"requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
 			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
 			input: ["text"],
@@ -8554,7 +8554,7 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "opencode-go",
 			baseUrl: "https://opencode.ai/zen/go/v1",
-			compat: {"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
 			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
 			input: ["text"],
@@ -8573,7 +8573,7 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "opencode-go",
 			baseUrl: "https://opencode.ai/zen/go/v1",
-			compat: {"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"maxTokensField":"max_tokens","requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
 			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
 			input: ["text"],
@@ -16310,6 +16310,23 @@ export const MODELS = {
 			contextWindow: 202800,
 			maxTokens: 64000,
 		} satisfies Model<"anthropic-messages">,
+		"zai/glm-5.2": {
+			id: "zai/glm-5.2",
+			name: "GLM 5.2",
+			api: "anthropic-messages",
+			provider: "vercel-ai-gateway",
+			baseUrl: "https://ai-gateway.vercel.sh",
+			reasoning: true,
+			input: ["text"],
+			cost: {
+				input: 1.4,
+				output: 4.4,
+				cacheRead: 0.26,
+				cacheWrite: 0,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"anthropic-messages">,
 		"zai/glm-5v-turbo": {
 			id: "zai/glm-5v-turbo",
 			name: "GLM 5V Turbo",