feat(openrouter): add support for reasoning budget in Claude Haiku 4.5

Author: daniel-lxs

packages/types/src/providers/openrouter.ts

@@ -84,6 +84,7 @@ export const OPEN_ROUTER_REASONING_BUDGET_MODELS = new Set([
 	"anthropic/claude-opus-4.1",
 	"anthropic/claude-sonnet-4",
 	"anthropic/claude-sonnet-4.5",
+	"anthropic/claude-haiku-4.5",
 	"google/gemini-2.5-pro-preview",
 	"google/gemini-2.5-pro",
 	"google/gemini-2.5-flash-preview-05-20",

src/api/providers/fetchers/openrouter.ts

@@ -253,6 +253,13 @@ export const parseOpenRouterModel = ({
 		modelInfo.maxTokens = anthropicModels["claude-opus-4-1-20250805"].maxTokens
 	}
 
+	// Ensure correct reasoning handling for Claude Haiku 4.5 on OpenRouter
+	// Use budget control and disable effort-based reasoning fallback
+	if (id === "anthropic/claude-haiku-4.5") {
+		modelInfo.supportsReasoningBudget = true
+		modelInfo.supportsReasoningEffort = false
+	}
+
 	// Set horizon-alpha model to 32k max tokens
 	if (id === "openrouter/horizon-alpha") {
 		modelInfo.maxTokens = 32768