Fix OpenRouter DeepSeek V4 xhigh reasoning

closes #4801

packages/ai/CHANGELOG.md

@@ -9,6 +9,7 @@
 
 ### Fixed
 
+- Fixed OpenRouter DeepSeek V4 `xhigh` reasoning metadata to preserve OpenRouter's native effort instead of sending DeepSeek's `max` effort ([#4801](https://github.com/earendil-works/pi/issues/4801)).
 - Fixed OpenAI Codex Responses replay after switching from Anthropic extended-thinking sessions by generating unique fallback message item IDs for converted thinking/text blocks ([#5148](https://github.com/earendil-works/pi/issues/5148)).
 - Fixed Anthropic-compatible replay for providers that return empty thinking signatures by adding an opt-in `allowEmptySignature` compatibility flag ([#4464](https://github.com/earendil-works/pi/issues/4464)).
 - Fixed OpenAI and OpenRouter GPT-5.5 Pro thinking level metadata to expose only supported medium, high, and xhigh efforts.

packages/ai/scripts/generate-models.ts

@@ -245,7 +245,12 @@ function applyThinkingLevelMetadata(model: Model<any>): void {
 		mergeAnthropicMessagesCompat(model, { forceAdaptiveThinking: true });
 	}
 	if (model.api === "openai-completions" && model.id.includes("deepseek-v4")) {
-		mergeThinkingLevelMap(model, DEEPSEEK_V4_THINKING_LEVEL_MAP);
+		mergeThinkingLevelMap(
+			model,
+			model.provider === "openrouter"
+				? { ...DEEPSEEK_V4_THINKING_LEVEL_MAP, xhigh: "xhigh" }
+				: DEEPSEEK_V4_THINKING_LEVEL_MAP,
+		);
 	}
 	if (isGoogleThinkingApi(model) && isGemini3ProModel(model.id)) {
 		mergeThinkingLevelMap(model, { off: null, minimal: null, low: "LOW", medium: null, high: "HIGH" });
@@ -1520,11 +1525,9 @@ async function generateModels() {
 					? {
 							requiresReasoningContentOnAssistantMessages:
 								deepseekCompat.requiresReasoningContentOnAssistantMessages,
-							thinkingFormat: deepseekCompat.thinkingFormat,
 						}
 					: deepseekCompat),
 			};
-			mergeThinkingLevelMap(candidate, DEEPSEEK_V4_THINKING_LEVEL_MAP);
 		}
 	}
 

packages/ai/src/models.generated.ts

@@ -8813,9 +8813,9 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "openrouter",
 			baseUrl: "https://openrouter.ai/api/v1",
-			compat: {"requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
-			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"xhigh"},
 			input: ["text"],
 			cost: {
 				input: 0.09999999999999999,
@@ -8832,9 +8832,9 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "openrouter",
 			baseUrl: "https://openrouter.ai/api/v1",
-			compat: {"requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
-			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"xhigh"},
 			input: ["text"],
 			cost: {
 				input: 0,
@@ -8851,9 +8851,9 @@ export const MODELS = {
 			api: "openai-completions",
 			provider: "openrouter",
 			baseUrl: "https://openrouter.ai/api/v1",
-			compat: {"requiresReasoningContentOnAssistantMessages":true,"thinkingFormat":"deepseek"},
+			compat: {"requiresReasoningContentOnAssistantMessages":true},
 			reasoning: true,
-			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"max"},
+			thinkingLevelMap: {"minimal":null,"low":null,"medium":null,"high":"high","xhigh":"xhigh"},
 			input: ["text"],
 			cost: {
 				input: 0.435,