fix(copilot): ensure available variants sync from api (#24734)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

packages/opencode/src/plugin/github-copilot/models.ts

@@ -58,7 +58,7 @@ function build(key: string, remote: Item, url: string, prev?: Model): Model {
 
   const isMsgApi = remote.supported_endpoints?.includes("/v1/messages")
 
-  return {
+  const model: Model = {
     id: key,
     providerID: "github-copilot",
     api: {
@@ -107,8 +107,50 @@ function build(key: string, remote: Item, url: string, prev?: Model): Model {
     release_date:
       prev?.release_date ??
       (remote.version.startsWith(`${remote.id}-`) ? remote.version.slice(remote.id.length + 1) : remote.version),
-    variants: prev?.variants ?? {},
   }
+
+  const efforts = remote.capabilities.supports.reasoning_effort
+  const variants: NonNullable<Model["variants"]> = {}
+  if (!isMsgApi && efforts?.length) {
+    efforts.forEach((effort) => {
+      variants[effort] = {
+        reasoningEffort: effort,
+        reasoningSummary: "auto",
+        include: ["reasoning.encrypted_content"],
+      }
+    })
+  } else {
+    if (efforts?.length && remote.capabilities.supports.adaptive_thinking) {
+      efforts.forEach((effort) => {
+        variants[effort] = {
+          thinking: {
+            type: "adaptive",
+            ...(model.api.id.includes("opus-4.7") ? { display: "summarized" } : {}),
+          },
+          effort,
+        }
+      })
+    } else if (remote.capabilities.supports.max_thinking_budget) {
+      const max = remote.capabilities.supports.max_thinking_budget
+      variants["max"] = {
+        thinking: {
+          type: "enabled",
+          budgetTokens: max - 1,
+        },
+      }
+      variants["high"] = {
+        thinking: {
+          type: "enabled",
+          budgetTokens: Math.floor(max / 2),
+        },
+      }
+    }
+  }
+  if (Object.keys(variants).length > 0) {
+    model.variants = variants
+  }
+
+  return model
 }
 
 export async function get(