fix: max tokens when using models like opus with providers other than anthropic (#4307)

packages/opencode/src/provider/transform.ts

@@ -176,7 +176,7 @@ export namespace ProviderTransform {
   }
 
   export function maxOutputTokens(
-    providerID: string,
+    npm: string,
     options: Record<string, any>,
     modelLimit: number,
     globalLimit: number,
@@ -184,7 +184,7 @@ export namespace ProviderTransform {
     const modelCap = modelLimit || globalLimit
     const standardLimit = Math.min(modelCap, globalLimit)
 
-    if (providerID === "anthropic") {
+    if (npm === "@ai-sdk/anthropic") {
       const thinking = options?.["thinking"]
       const budgetTokens = typeof thinking?.["budgetTokens"] === "number" ? thinking["budgetTokens"] : 0
       const enabled = thinking?.["type"] === "enabled"

packages/opencode/src/session/prompt.ts

@@ -345,7 +345,7 @@ export namespace SessionPrompt {
           maxRetries: 0,
           activeTools: Object.keys(tools).filter((x) => x !== "invalid"),
           maxOutputTokens: ProviderTransform.maxOutputTokens(
-            model.providerID,
+            model.npm ?? "",
             params.options,
             model.info.limit.output,
             OUTPUT_TOKEN_MAX,