diff --git a/packages/ai/src/protocols/open-responses.ts b/packages/ai/src/protocols/open-responses.ts
index 33594399697..80a0299ce35 100644
--- a/packages/ai/src/protocols/open-responses.ts
+++ b/packages/ai/src/protocols/open-responses.ts
@@ -657,14 +657,7 @@ const lowerMessages = Effect.fn("OpenResponses.lowerMessages")(function* (reques
     }
   }
 
-  // With store:false, Responses APIs only accept previous reasoning items when the
-  // complete item has encrypted state. Summary blocks for one item may carry
-  // that state only on the last block, so filter after they have been joined.
-  return store === false
-    ? input.filter(
-        (item) => !("type" in item) || item.type !== "reasoning" || typeof item.encrypted_content === "string",
-      )
-    : input
+  return input
 })
 
 const lowerOptions = (request: LLMRequest) => {
diff --git a/packages/ai/test/provider/openai-responses.test.ts b/packages/ai/test/provider/openai-responses.test.ts
index e3eba0b3e02..f798bd80e2b 100644
--- a/packages/ai/test/provider/openai-responses.test.ts
+++ b/packages/ai/test/provider/openai-responses.test.ts
@@ -3157,7 +3157,7 @@ describe("OpenAI Responses route", () => {
     }),
   )
 
-  it.effect("skips non-persisted reasoning ids without encrypted state", () =>
+  it.effect("replays stateless reasoning without encrypted state", () =>
     Effect.gen(function* () {
       const prepared = yield* compileRequest(
         LLM.request({
@@ -3187,6 +3187,12 @@ describe("OpenAI Responses route", () => {
       expect(prepared.body).toMatchObject({
         input: [
           { role: "user", content: [{ type: "input_text", text: "What changed?" }] },
+          {
+            type: "reasoning",
+            id: "rs_1",
+            summary: [{ type: "summary_text", text: "Checked the previous diff." }],
+            encrypted_content: null,
+          },
           { role: "assistant", content: [{ type: "output_text", text: "The parser changed." }] },
           { role: "user", content: [{ type: "input_text", text: "Summarize it." }] },
         ],