From 561afb401a4df9c8e677011b87e08f65b31cdfc3 Mon Sep 17 00:00:00 2001
From: Steven Ao <stevenao@users.noreply.github.com>
Date: Tue, 11 Aug 2026 14:04:36 -0700
Subject: [PATCH] fix(opencode): detect Copilot PDF input support (#41522)

---
 .../src/plugin/github-copilot/models.ts       |  5 +-
 .../test/plugin/github-copilot-models.test.ts | 68 +++++++++++++++++++
 2 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/packages/opencode/src/plugin/github-copilot/models.ts b/packages/opencode/src/plugin/github-copilot/models.ts
index f3f32a0b0b..870e3f87a0 100644
--- a/packages/opencode/src/plugin/github-copilot/models.ts
+++ b/packages/opencode/src/plugin/github-copilot/models.ts
@@ -88,6 +88,9 @@ function build(key: string, remote: SelectableItem, url: string, prev?: Model):
   const image =
     (remote.capabilities.supports.vision ?? false) ||
     (remote.capabilities.limits.vision?.supported_media_types ?? []).some((item) => item.startsWith("image/"))
+  const pdf =
+    (remote.capabilities.supports.vision ?? false) &&
+    (remote.capabilities.limits.vision?.supported_media_types?.includes("application/pdf") ?? false)
 
   const isMsgApi = remote.supported_endpoints?.includes("/v1/messages")
   const endpoint: CopilotEndpoint | undefined = isMsgApi
@@ -127,7 +130,7 @@ function build(key: string, remote: SelectableItem, url: string, prev?: Model):
         audio: false,
         image,
         video: false,
-        pdf: false,
+        pdf,
       },
       output: {
         text: true,
diff --git a/packages/opencode/test/plugin/github-copilot-models.test.ts b/packages/opencode/test/plugin/github-copilot-models.test.ts
index e6d89fe01c..d968402e3b 100644
--- a/packages/opencode/test/plugin/github-copilot-models.test.ts
+++ b/packages/opencode/test/plugin/github-copilot-models.test.ts
@@ -187,6 +187,74 @@ test("converts Copilot AIC token prices to USD per million tokens", async () =>
   expect(models["ignored-non-chat-record"]).toBeUndefined()
 })
 
+test("detects PDF input support when vision and media type are advertised", async () => {
+  globalThis.fetch = mock(() =>
+    Promise.resolve(
+      new Response(
+        JSON.stringify({
+          data: [
+            {
+              model_picker_enabled: true,
+              id: "pdf-model",
+              name: "PDF Model",
+              version: "pdf-model-2026-06-01",
+              capabilities: {
+                family: "pdf-model",
+                limits: {
+                  max_context_window_tokens: 128000,
+                  max_output_tokens: 16384,
+                  max_prompt_tokens: 128000,
+                  vision: {
+                    max_prompt_image_size: 10000000,
+                    max_prompt_images: 10,
+                    supported_media_types: ["application/pdf"],
+                  },
+                },
+                supports: {
+                  streaming: true,
+                  vision: true,
+                  tool_calls: true,
+                },
+              },
+            },
+            {
+              model_picker_enabled: true,
+              id: "vision-only-model",
+              name: "Vision Only Model",
+              version: "vision-only-model-2026-06-01",
+              capabilities: {
+                family: "vision-only-model",
+                limits: {
+                  max_context_window_tokens: 128000,
+                  max_output_tokens: 16384,
+                  max_prompt_tokens: 128000,
+                  vision: {
+                    max_prompt_image_size: 10000000,
+                    max_prompt_images: 10,
+                    supported_media_types: ["image/png"],
+                  },
+                },
+                supports: {
+                  streaming: true,
+                  vision: true,
+                  tool_calls: true,
+                },
+              },
+            },
+          ],
+        }),
+        { status: 200 },
+      ),
+    ),
+  ) as unknown as typeof fetch
+
+  const models = (await CopilotModels.get("https://api.githubcopilot.com")).models
+  const model = models["pdf-model"]
+
+  expect(model.capabilities.input.pdf).toBe(true)
+  expect(models["vision-only-model"].capabilities.input.pdf).toBe(false)
+})
+
 test("uses zero cost when Copilot reports a zero billing batch size", async () => {
   globalThis.fetch = mock(() =>
     Promise.resolve(