diff --git a/packages/opencode/src/session/llm/ai-sdk.ts b/packages/opencode/src/session/llm/ai-sdk.ts
index 8db8985d7b0..13d427aab62 100644
--- a/packages/opencode/src/session/llm/ai-sdk.ts
+++ b/packages/opencode/src/session/llm/ai-sdk.ts
@@ -2,6 +2,7 @@ import { FinishReason, LLMEvent, ProviderMetadata, ToolResultValue } from "@open
 import { Effect, Schema } from "effect"
 import { type streamText } from "ai"
 import { errorMessage } from "@/util/error"
+import { ProviderError } from "@/provider/error"
 
 type Result = Awaited<ReturnType<typeof streamText>>
 type AISDKEvent = Result["fullStream"] extends AsyncIterable<infer T> ? T : never
@@ -85,6 +86,8 @@ export function toLLMEvents(
       return Effect.succeed([LLMEvent.stepStart({ index: state.step })])
 
     case "finish-step":
+      if (event.rawFinishReason === "network_error")
+        return Effect.fail(new ProviderError.ResponseStreamError("Provider finish_reason: network_error"))
       return Effect.sync(() => {
         const original = providerMetadata(event.providerMetadata)
         const metadata =
diff --git a/packages/opencode/test/session/llm.test.ts b/packages/opencode/test/session/llm.test.ts
index 3bfc722e2be..635e697517c 100644
--- a/packages/opencode/test/session/llm.test.ts
+++ b/packages/opencode/test/session/llm.test.ts
@@ -27,6 +27,7 @@ import { ModelV2 } from "@opencode-ai/core/model"
 import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { LayerNode } from "@opencode-ai/core/effect/layer-node"
 import { LayerNodePlatform } from "@opencode-ai/core/effect/app-node-platform"
+import { ProviderError } from "@/provider/error"
 
 type ConfigModel = NonNullable<NonNullable<ConfigV1.Info["provider"]>[string]["models"]>[string]
 
@@ -832,6 +833,70 @@ describe("session.llm.stream", () => {
     },
   )
 
+  it.instance(
+    "surfaces network_error finish reasons as retryable stream failures",
+    () =>
+      Effect.gen(function* () {
+        const fixture = loadFixture(vivgridFixture.providerID, vivgridFixture.modelID)
+        const request = waitRequest(
+          "/chat/completions",
+          createEventResponse(
+            [
+              {
+                id: "chatcmpl-network-error",
+                object: "chat.completion.chunk",
+                choices: [{ index: 0, delta: { role: "assistant", content: "" }, finish_reason: "network_error" }],
+              },
+            ],
+            true,
+          ),
+        )
+        const resolved = yield* Provider.use.getModel(
+          ProviderV2.ID.make(vivgridFixture.providerID),
+          ModelV2.ID.make(fixture.model.id),
+        )
+        const sessionID = SessionID.make("session-test-network-error")
+        const agent = {
+          name: "test",
+          mode: "primary",
+          options: {},
+          permission: [{ permission: "*", pattern: "*", action: "allow" }],
+        } satisfies Agent.Info
+        const user = {
+          id: MessageID.make("msg_user-network-error"),
+          sessionID,
+          role: "user",
+          time: { created: Date.now() },
+          agent: agent.name,
+          model: { providerID: ProviderV2.ID.make(vivgridFixture.providerID), modelID: resolved.id },
+        } satisfies SessionV1.User
+
+        const error = yield* drain({
+          user,
+          sessionID,
+          model: resolved,
+          agent,
+          system: ["You are a helpful assistant."],
+          messages: [{ role: "user", content: "Hello" }],
+          tools: {},
+        }).pipe(Effect.flip)
+        yield* Effect.promise(() => request)
+
+        if (!(error instanceof ProviderError.ResponseStreamError)) throw error
+        expect(error.message).toBe("Provider finish_reason: network_error")
+      }),
+    {
+      config: () => ({
+        enabled_providers: [vivgridFixture.providerID],
+        provider: {
+          [vivgridFixture.providerID]: {
+            options: { apiKey: "test-key", baseURL: `${state.server!.url.origin}/v1` },
+          },
+        },
+      }),
+    },
+  )
+
   const cerebrasFixture = { providerID: "cerebras", modelID: "gpt-oss-120b" }
   it.instance(
     "replays Cerebras assistant reasoning using the provider-supported field",
diff --git a/packages/opencode/test/session/processor-effect.test.ts b/packages/opencode/test/session/processor-effect.test.ts
index 052477d0a2e..c67f82d9c71 100644
--- a/packages/opencode/test/session/processor-effect.test.ts
+++ b/packages/opencode/test/session/processor-effect.test.ts
@@ -651,6 +651,63 @@ it.live("session.processor effect tests retry OpenAI-compatible midstream server
   ),
 )
 
+it.live("session.processor effect tests retry network_error finish reasons", () =>
+  provideTmpdirServer(
+    ({ dir, llm }) =>
+      Effect.gen(function* () {
+        const { processors, session, provider } = yield* boot()
+
+        yield* llm.push(
+          raw({
+            chunks: [
+              {
+                id: "chatcmpl-network-error",
+                object: "chat.completion.chunk",
+                choices: [{ index: 0, delta: { role: "assistant", content: "" }, finish_reason: "network_error" }],
+              },
+            ],
+          }),
+        )
+        yield* llm.text("after retry")
+
+        const chat = yield* session.create({})
+        const parent = yield* user(chat.id, "retry network error")
+        const msg = yield* assistant(chat.id, parent.id, path.resolve(dir))
+        const mdl = yield* provider.getModel(ref.providerID, ref.modelID)
+        const handle = yield* processors.create({
+          assistantMessage: msg,
+          sessionID: chat.id,
+          model: mdl,
+        })
+
+        const value = yield* handle.process({
+          user: {
+            id: parent.id,
+            sessionID: chat.id,
+            role: "user",
+            time: parent.time,
+            agent: parent.agent,
+            model: { providerID: ref.providerID, modelID: ref.modelID },
+          } satisfies SessionV1.User,
+          sessionID: chat.id,
+          model: mdl,
+          agent: agent(),
+          system: [],
+          messages: [{ role: "user", content: "retry network error" }],
+          tools: {},
+        })
+
+        const parts = yield* MessageV2.parts(msg.id)
+
+        expect(value).toBe("continue")
+        expect(yield* llm.calls).toBe(2)
+        expect(parts.some((part) => part.type === "text" && part.text === "after retry")).toBe(true)
+        expect(handle.message.error).toBeUndefined()
+      }),
+    { config: (url) => providerCfg(url) },
+  ),
+)
+
 it.live("session.processor effect tests publish retry status updates", () =>
   provideTmpdirServer(
     ({ dir, llm }) =>