fix vercel gateway variants (#13541)

Co-authored-by: Benjamin Woodruff <github@benjam.info>"

packages/opencode/src/provider/transform.ts

@@ -171,7 +171,7 @@ export namespace ProviderTransform {
     return msgs
   }
 
-  function applyCaching(msgs: ModelMessage[], providerID: string): ModelMessage[] {
+  function applyCaching(msgs: ModelMessage[], model: Provider.Model): ModelMessage[] {
     const system = msgs.filter((msg) => msg.role === "system").slice(0, 2)
     const final = msgs.filter((msg) => msg.role !== "system").slice(-2)
 
@@ -194,7 +194,7 @@ export namespace ProviderTransform {
     }
 
     for (const msg of unique([...system, ...final])) {
-      const useMessageLevelOptions = providerID === "anthropic" || providerID.includes("bedrock")
+      const useMessageLevelOptions = model.providerID === "anthropic" || model.providerID.includes("bedrock")
       const shouldUseContentOptions = !useMessageLevelOptions && Array.isArray(msg.content) && msg.content.length > 0
 
       if (shouldUseContentOptions) {
@@ -253,14 +253,15 @@ export namespace ProviderTransform {
     msgs = unsupportedParts(msgs, model)
     msgs = normalizeMessages(msgs, model, options)
     if (
-      model.providerID === "anthropic" ||
-      model.api.id.includes("anthropic") ||
-      model.api.id.includes("claude") ||
-      model.id.includes("anthropic") ||
-      model.id.includes("claude") ||
-      model.api.npm === "@ai-sdk/anthropic"
+      (model.providerID === "anthropic" ||
+        model.api.id.includes("anthropic") ||
+        model.api.id.includes("claude") ||
+        model.id.includes("anthropic") ||
+        model.id.includes("claude") ||
+        model.api.npm === "@ai-sdk/anthropic") &&
+      model.api.npm !== "@ai-sdk/gateway"
     ) {
-      msgs = applyCaching(msgs, model.providerID)
+      msgs = applyCaching(msgs, model)
     }
 
     // Remap providerOptions keys from stored providerID to expected SDK key
@@ -363,8 +364,50 @@ export namespace ProviderTransform {
         if (!model.id.includes("gpt") && !model.id.includes("gemini-3")) return {}
         return Object.fromEntries(OPENAI_EFFORTS.map((effort) => [effort, { reasoning: { effort } }]))
 
-      // TODO: YOU CANNOT SET max_tokens if this is set!!!
       case "@ai-sdk/gateway":
+        if (model.id.includes("anthropic")) {
+          return {
+            high: {
+              thinking: {
+                type: "enabled",
+                budgetTokens: 16000,
+              },
+            },
+            max: {
+              thinking: {
+                type: "enabled",
+                budgetTokens: 31999,
+              },
+            },
+          }
+        }
+        if (model.id.includes("google")) {
+          if (id.includes("2.5")) {
+            return {
+              high: {
+                thinkingConfig: {
+                  includeThoughts: true,
+                  thinkingBudget: 16000,
+                },
+              },
+              max: {
+                thinkingConfig: {
+                  includeThoughts: true,
+                  thinkingBudget: 24576,
+                },
+              },
+            }
+          }
+          return Object.fromEntries(
+            ["low", "high"].map((effort) => [
+              effort,
+              {
+                includeThoughts: true,
+                thinkingLevel: effort,
+              },
+            ]),
+          )
+        }
         return Object.fromEntries(OPENAI_EFFORTS.map((effort) => [effort, { reasoningEffort: effort }]))
 
       case "@ai-sdk/github-copilot":
@@ -720,6 +763,12 @@ export namespace ProviderTransform {
       result["promptCacheKey"] = input.sessionID
     }
 
+    if (input.model.api.npm === "@ai-sdk/gateway") {
+      result["gateway"] = {
+        caching: "auto",
+      }
+    }
+
     return result
   }
 
@@ -754,6 +803,34 @@ export namespace ProviderTransform {
   }
 
   export function providerOptions(model: Provider.Model, options: { [x: string]: any }) {
+    if (model.api.npm === "@ai-sdk/gateway") {
+      // Gateway providerOptions are split across two namespaces:
+      // - `gateway`: gateway-native routing/caching controls
+      // - `<upstream slug>`: provider-specific model options (anthropic/openai/...)
+      // We keep `gateway` as-is and route every other top-level option under the
+      // model-derived upstream slug so variants/options can stay flat internally.
+      const i = model.api.id.indexOf("/")
+      const slug = i > 0 ? model.api.id.slice(0, i) : undefined
+      const gateway = options.gateway
+      const rest = Object.fromEntries(Object.entries(options).filter(([k]) => k !== "gateway"))
+      const has = Object.keys(rest).length > 0
+
+      const result: Record<string, any> = {}
+      if (gateway !== undefined) result.gateway = gateway
+
+      if (has) {
+        if (slug) {
+          result[slug] = rest
+        } else if (gateway && typeof gateway === "object" && !Array.isArray(gateway)) {
+          result.gateway = { ...gateway, ...rest }
+        } else {
+          result.gateway = rest
+        }
+      }
+
+      return result
+    }
+
     const key = sdkKey(model.api.npm) ?? model.providerID
     return { [key]: options }
   }