fix(codex): request reasoning summaries (#4359)

Adds reasoning.summary=auto + reasoning.encrypted_content include for Codex. Thanks @xz-dev.

open-sse/executors/codex.ts

@@ -618,6 +618,9 @@ function clampEffort(model: string, requested: string): string {
   return requested;
 }
 
+const CODEX_REASONING_ENCRYPTED_CONTENT_INCLUDE = "reasoning.encrypted_content";
+const CODEX_DEFAULT_REASONING_SUMMARY = "auto";
+
 function normalizeEffortValue(value: unknown): string | undefined {
   if (typeof value !== "string") return undefined;
   const normalized = value.trim().toLowerCase();
@@ -625,6 +628,27 @@ function normalizeEffortValue(value: unknown): string | undefined {
   return normalized || undefined;
 }
 
+function ensureCodexReasoningSummary(body: Record<string, unknown>): void {
+  const reasoning =
+    body.reasoning && typeof body.reasoning === "object" && !Array.isArray(body.reasoning)
+      ? (body.reasoning as Record<string, unknown>)
+      : null;
+  if (!reasoning || normalizeEffortValue(reasoning.effort) === "none") return;
+
+  if (!("summary" in reasoning)) {
+    reasoning.summary = CODEX_DEFAULT_REASONING_SUMMARY;
+  }
+
+  if (!Array.isArray(body.include)) {
+    body.include = [CODEX_REASONING_ENCRYPTED_CONTENT_INCLUDE];
+    return;
+  }
+
+  if (!body.include.includes(CODEX_REASONING_ENCRYPTED_CONTENT_INCLUDE)) {
+    body.include = [...body.include, CODEX_REASONING_ENCRYPTED_CONTENT_INCLUDE];
+  }
+}
+
 function consumeResponsesStoreMarker(body: Record<string, unknown>): unknown {
   const marker = body._omnirouteResponsesStore;
   delete body._omnirouteResponsesStore;
@@ -1321,6 +1345,7 @@ export class CodexExecutor extends BaseExecutor {
         effort: clampEffort(cleanModel, rawEffort),
       };
     }
+    ensureCodexReasoningSummary(body);
     delete body.reasoning_effort;
 
     // Remove unsupported token limit parameters BEFORE the passthrough return.

tests/unit/executor-codex.test.ts

@@ -242,10 +242,10 @@ test("CodexExecutor.transformRequest injects default instructions, clamps reason
     requestEndpointPath: "/responses",
   });
 
-  assert.equal(result.stream, true);
-  assert.equal(result.store, false);
+  assert.deepEqual([result.stream, result.store], [true, false]);
   assert.equal(result.instructions.length > 0, true);
-  assert.equal(result.reasoning.effort, "high");
+  assert.deepEqual(result.reasoning, { effort: "high", summary: "auto" });
+  assert.deepEqual(result.include, ["reasoning.encrypted_content"]);
   assert.equal(result.service_tier, "priority");
   assert.equal(result.messages, undefined);
   assert.equal(result.prompt, undefined);
@@ -736,7 +736,7 @@ test("CodexExecutor.transformRequest keeps explicit request values ahead of conn
     }
   );
 
-  assert.equal(result.reasoning.effort, "none");
+  assert.deepEqual([result.reasoning, result.include], [{ effort: "none" }, undefined]);
   assert.equal(result.service_tier, "standard");
 });
 
@@ -806,7 +806,8 @@ test("CodexExecutor.transformRequest passes GPT 5.4 Mini xhigh reasoning through
     {
       model: "gpt-5.4-mini",
       input: [],
-      reasoning: { effort: "xhigh", summary: "auto" },
+      reasoning: { effort: "xhigh", summary: "detailed" },
+      include: ["code_interpreter_call.outputs"],
     },
     true,
     {
@@ -822,11 +823,8 @@ test("CodexExecutor.transformRequest passes GPT 5.4 Mini xhigh reasoning through
   const reasoning = getRecord(sanitized.reasoning);
 
   assert.equal(sanitized.model, "gpt-5.4-mini");
-  // #3756: xhigh now passes through by default. gpt-5.4-mini has no
-  // supportsXHighEffort:false flag (and ships a gpt-5.4-mini-xhigh catalog
-  // variant), so the effort is preserved instead of downgraded to "high".
-  assert.equal(reasoning.effort, "xhigh");
-  assert.equal(reasoning.summary, "auto");
+  assert.deepEqual(reasoning, { effort: "xhigh", summary: "detailed" });
+  assert.deepEqual(sanitized.include, ["code_interpreter_call.outputs", "reasoning.encrypted_content"]);
   assert.equal(sanitized.reasoning_effort, undefined);
 });