diff --git a/docs-site/src/content/docs/reference/adapters.md b/docs-site/src/content/docs/reference/adapters.md
index 8f524e39c1..7acc2dc7f7 100644
--- a/docs-site/src/content/docs/reference/adapters.md
+++ b/docs-site/src/content/docs/reference/adapters.md
@@ -451,6 +451,13 @@ Login opens Auth0 browser sign-in, then exchanges the Firebase ID token via
 - Experimental unofficial bridge; not shown in the dashboard preset by default. See the
   [provider guide](/guides/providers/) for login instructions.
 
+For SWE-2, an explicit reasoning effort overrides an effort suffix in the model
+id. For example, `swe-2-high` with `medium` selects the native `swe-2-medium` UID;
+`xhigh`, `ultra`, and `max` select `swe-2-max`. Values below Medium select Medium
+and do not disable SWE-2 reasoning. Without an explicit effort, a suffixed model
+id is preserved. This applies to both Devin account providers through their
+shared adapter; other model families keep their existing suffix precedence.
+
 ## `devin-cli`
 
 **Targets:** Cognition's `exa.api_server_pb.ApiServerService/GetChatMessage`, the same Connect
diff --git a/src/adapters/devin.ts b/src/adapters/devin.ts
index ab7abfa0a9..1d7a15f8d6 100644
--- a/src/adapters/devin.ts
+++ b/src/adapters/devin.ts
@@ -84,6 +84,39 @@ function hasEffortSuffix(modelId: string): boolean {
   return parts.length > 1 && EFFORT_SUFFIXES.has(parts[parts.length - 1]!);
 }
 
+/**
+ * SWE-2 ships exactly three native lanes. Cognition spells them as the model id,
+ * not as a separate effort field, so an explicit caller effort has to be resolved
+ * to the UID before the suffix shortcut below accepts whatever the picker sent.
+ *
+ * Kept as a named table rather than an inline branch because EFFORT_SUFFIXES does
+ * not carry `ultra`, `off`, or `minimal`, so the two would drift apart silently.
+ * Values below Medium select Medium: SWE-2 has no lane under it, and rounding down
+ * to nothing would quietly disable its reasoning.
+ */
+const SWE2_EFFORT: Record<string, "medium" | "high" | "max"> = {
+  none: "medium",
+  off: "medium",
+  minimal: "medium",
+  low: "medium",
+  medium: "medium",
+  high: "high",
+  xhigh: "max",
+  ultra: "max",
+  max: "max",
+};
+
+/**
+ * Resolve an explicit effort onto a SWE-2 lane, or undefined when this is not a
+ * SWE-2 id or the caller named no usable effort. Undefined leaves every existing
+ * path untouched, which is what keeps other model families on suffix precedence.
+ */
+function resolveSwe2Variant(modelId: string, reasoningEffort?: string): string | undefined {
+  if (!/^swe-2(?:-(?:medium|high|max))?$/.test(modelId)) return undefined;
+  const mapped = reasoningEffort ? SWE2_EFFORT[reasoningEffort.toLowerCase()] : undefined;
+  return mapped ? `swe-2-${mapped}` : undefined;
+}
+
 /**
  * Resolve the wire model UID using the live catalog as the source of truth.
  * Cognition's catalog lists most models with an effort suffix
@@ -103,6 +136,11 @@ async function resolveWireModelUid(
   reasoningEffort?: string,
 ): Promise<string> {
   const modelId = normalizeDevinModelId(rawModelId);
+  // Explicit effort wins over a suffix the picker already baked into the id, so
+  // `swe-2-high` asked for at `medium` becomes `swe-2-medium` instead of ignoring
+  // the caller. Runs before the shortcut below, which would otherwise return early.
+  const swe2 = resolveSwe2Variant(modelId, reasoningEffort);
+  if (swe2) return swe2;
   if (hasEffortSuffix(modelId)) return modelId;
   const catalog = await getCachedCatalog(apiKey, host);
   if (catalog) {
@@ -120,6 +158,13 @@ async function resolveWireModelUid(
   return `${modelId}-${effort}`;
 }
 
+/**
+ * Test seam. The resolver stays module-private because it reaches the catalog;
+ * exporting it under its bare name would make an async network-touching helper
+ * part of the adapter public API. Mirrors sanitizeToolDescriptionForCognitionForTests.
+ */
+export const resolveWireModelUidForTests = resolveWireModelUid;
+
 export class DevinMissingCredentialError extends Error {
   constructor() {
     super("Devin live transport requires a Devin API key. Run ocx login devin to sign in with your Cognition/Devin account.");
diff --git a/structure/adapters/registry.md b/structure/adapters/registry.md
index 2bc849c3cc..d44c3b99ac 100644
--- a/structure/adapters/registry.md
+++ b/structure/adapters/registry.md
@@ -97,3 +97,10 @@ Live sideband admission and its bounded upstream handshake follow the [runtime c
 
 
 Translated Chat request construction uses the [inline-image budget](../transports/streaming-health.md#translated-chat-inline-image-budget); the shared normalizer counts retained bytes even when a wire-specific drop callback keeps the image attached.
+
+## SWE-2 model effort selection
+
+`src/adapters/devin.ts` resolves an explicit SWE-2 reasoning effort to the native
+medium/high/max UID before accepting a suffix already present in the model id.
+Both Devin provider rows share this resolver. Omitted effort preserves an explicit
+variant; unrelated model families retain their existing suffix precedence.
diff --git a/tests/providers/devin-adapter.test.ts b/tests/providers/devin-adapter.test.ts
index aa22e0edce..0054629b9e 100644
--- a/tests/providers/devin-adapter.test.ts
+++ b/tests/providers/devin-adapter.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test";
-import { createDevinAdapter, mapOcxMessagesToDevin, mapOcxToolsToDevin } from "../../src/adapters/devin";
+import { createDevinAdapter, mapOcxMessagesToDevin, mapOcxToolsToDevin, resolveWireModelUidForTests } from "../../src/adapters/devin";
 import { sanitizeToolDescriptionForCognitionForTests } from "../../src/adapters/devin/cloud-direct/chat";
 import { DEVIN_MODEL_CONTEXT_WINDOWS, DEVIN_STATIC_MODELS, collapseDevinModelUid } from "../../src/adapters/devin/live-models";
 import { parseCatalogBuffer } from "../../src/adapters/devin/cloud-direct/catalog";
@@ -201,3 +201,38 @@ describe("devin adapter", () => {
     }
   });
 });
+
+describe("SWE-2 wire effort selection", () => {
+  // Cognition spells SWE-2 effort as the model id, so an explicit effort has to
+  // beat a suffix the picker already chose. Before this, swe-2-high asked for at
+  // medium stayed high and the caller was silently ignored.
+  test.each(["medium", "high", "max"])("an explicit %s effort overrides every SWE-2 variant", async (effort) => {
+    for (const model of ["swe-2", "swe-2-medium", "swe-2-high", "swe-2-max", "swe-2.high"]) {
+      expect(await resolveWireModelUidForTests(model, "unused", "unused", effort)).toBe(`swe-2-${effort}`);
+    }
+  });
+
+  test.each([
+    ["none", "medium"], ["off", "medium"], ["minimal", "medium"],
+    ["low", "medium"], ["xhigh", "max"], ["ultra", "max"],
+  ])("maps %s to the supported SWE-2 %s lane", async (effort, expected) => {
+    expect(await resolveWireModelUidForTests("swe-2-high", "unused", "unused", effort)).toBe(`swe-2-${expected}`);
+  });
+
+  // Case is normalised, which the source contribution did not do: a caller that
+  // sends HIGH means the same lane as high.
+  test("effort matching is case-insensitive", async () => {
+    expect(await resolveWireModelUidForTests("swe-2-medium", "unused", "unused", "HIGH")).toBe("swe-2-high");
+  });
+
+  test("omitted or unknown effort preserves an explicit variant", async () => {
+    expect(await resolveWireModelUidForTests("swe-2-high", "unused", "unused")).toBe("swe-2-high");
+    expect(await resolveWireModelUidForTests("swe-2-max", "unused", "unused", "future-effort")).toBe("swe-2-max");
+  });
+
+  test("other model families keep their existing suffix precedence", async () => {
+    for (const model of ["claude-opus-5-medium", "gpt-5-6-sol-high", "swe-1-7-high", "swe-20-high"]) {
+      expect(await resolveWireModelUidForTests(model, "unused", "unused", "max")).toBe(model);
+    }
+  });
+});