diff --git a/frontend/libs/api-enums/src/lib/common/generation/CommonQuality.ts b/frontend/libs/api-enums/src/lib/common/generation/CommonQuality.ts
new file mode 100644
index 0000000000..5e35935d44
--- /dev/null
+++ b/frontend/libs/api-enums/src/lib/common/generation/CommonQuality.ts
@@ -0,0 +1,9 @@
+
+// NOTE: These are defined in Rust (as the source of truth) and duplicated in the frontend.
+// In the future, we should use code gen (protobufs or similar) to keep the two sides in sync.
+
+export enum CommonQuality {
+  High = "high",
+  Medium = "medium",
+  Low = "low",
+}
diff --git a/frontend/libs/api-enums/src/lib/common/generation/index.ts b/frontend/libs/api-enums/src/lib/common/generation/index.ts
index 4a3922ff64..199355876a 100644
--- a/frontend/libs/api-enums/src/lib/common/generation/index.ts
+++ b/frontend/libs/api-enums/src/lib/common/generation/index.ts
@@ -1,6 +1,7 @@
 export * from "./CommonImageModel.js";
 export * from "./CommonVideoModel.js";
 export * from "./CommonAspectRatio.js";
+export * from "./CommonQuality.js";
 export * from "./CommonVideoResolution.js";
 export * from "./GenerationMode.js";
 export * from "./ImageGenerationMode.js";
diff --git a/frontend/libs/components/pricing-modal/src/lib/convert/imageQualityToCommonQuality.ts b/frontend/libs/components/pricing-modal/src/lib/convert/imageQualityToCommonQuality.ts
new file mode 100644
index 0000000000..5ba9c2304f
--- /dev/null
+++ b/frontend/libs/components/pricing-modal/src/lib/convert/imageQualityToCommonQuality.ts
@@ -0,0 +1,21 @@
+import { CommonQuality } from "@storyteller/api-enums";
+
+/**
+ * Convert a quality value to CommonQuality for the image cost estimate API.
+ *
+ * Accepts a CommonQuality string value from @storyteller/model-list ("high", "medium", "low").
+ */
+export function imageQualityToCommonQuality(
+  quality: string | undefined,
+): CommonQuality | null {
+  switch (quality) {
+    case "high":
+      return CommonQuality.High;
+    case "medium":
+      return CommonQuality.Medium;
+    case "low":
+      return CommonQuality.Low;
+    default:
+      return null;
+  }
+}
diff --git a/frontend/libs/components/pricing-modal/src/lib/convert/index.ts b/frontend/libs/components/pricing-modal/src/lib/convert/index.ts
index ee778ad453..d631aaf06c 100644
--- a/frontend/libs/components/pricing-modal/src/lib/convert/index.ts
+++ b/frontend/libs/components/pricing-modal/src/lib/convert/index.ts
@@ -3,5 +3,6 @@ export * from "./videoAspectRatioToCommonAspectRatio.js";
 export * from "./videoStoreToGenerationMode.js";
 export * from "./imageModelToCommonImageModel.js";
 export * from "./imageAspectRatioToCommonAspectRatio.js";
+export * from "./imageQualityToCommonQuality.js";
 export * from "./imageResolutionToCommonVideoResolution.js";
 export * from "./imageStoreToGenerationMode.js";
diff --git a/frontend/libs/components/pricing-modal/src/lib/useImageCostEstimate.ts b/frontend/libs/components/pricing-modal/src/lib/useImageCostEstimate.ts
index 23f055d412..b8d3cbb477 100644
--- a/frontend/libs/components/pricing-modal/src/lib/useImageCostEstimate.ts
+++ b/frontend/libs/components/pricing-modal/src/lib/useImageCostEstimate.ts
@@ -16,6 +16,7 @@ import { useCostBreakdownModalStore } from "./cost-breakdown-modal-store";
 import {
   imageModelToCommonImageModel,
   imageAspectRatioToCommonAspectRatio,
+  imageQualityToCommonQuality,
   imageResolutionToCommonVideoResolution,
 } from "./convert/index.js";
 
@@ -117,6 +118,7 @@ export function useImageCostEstimate(
     );
     const commonResolution =
       imageResolutionToCommonVideoResolution(resolutionStr);
+    const commonQuality = imageQualityToCommonQuality(qualityStr);
     const generationMode =
       referenceImageCount > 0
         ? { type: "image_edit" as const, count: referenceImageCount }
@@ -134,7 +136,7 @@ export function useImageCostEstimate(
       generation_mode: generationMode,
       aspect_ratio: commonAspectRatio ?? undefined,
       resolution: commonResolution ?? undefined,
-      quality: qualityStr ?? undefined,
+      quality: commonQuality ?? undefined,
     })
       .then((result) => {
         if (isEstimateImageCostSuccess(result)) {
diff --git a/frontend/libs/tauri-api/src/lib/cost_estimate/EstimateImageCost.ts b/frontend/libs/tauri-api/src/lib/cost_estimate/EstimateImageCost.ts
index 2a3468a96a..d3c897694e 100644
--- a/frontend/libs/tauri-api/src/lib/cost_estimate/EstimateImageCost.ts
+++ b/frontend/libs/tauri-api/src/lib/cost_estimate/EstimateImageCost.ts
@@ -3,6 +3,7 @@ import { CommandResult, CommandSuccessStatus } from "../common/CommandStatus";
 import {
   CommonImageModel,
   CommonAspectRatio,
+  CommonQuality,
   CommonVideoResolution,
   ImageGenerationMode,
   GenerationProvider,
@@ -14,7 +15,7 @@ export interface EstimateImageCostRequest {
   generation_mode: ImageGenerationMode;
   aspect_ratio?: CommonAspectRatio;
   resolution?: CommonVideoResolution;
-  quality?: string;
+  quality?: CommonQuality;
   image_batch_count?: number;
 }