diff --git a/studio/backend/core/data_recipe/oxc-validator/validate.mjs b/studio/backend/core/data_recipe/oxc-validator/validate.mjs
index 28f9f242e3..a3ec29bf3c 100644
--- a/studio/backend/core/data_recipe/oxc-validator/validate.mjs
+++ b/studio/backend/core/data_recipe/oxc-validator/validate.mjs
@@ -100,36 +100,37 @@ function normalizeLintDiagnostic(diagnostic) {
   if (!diagnostic || typeof diagnostic !== "object") {
     return null;
   }
+
+  const readString = (value) =>
+    typeof value === "string" ? value : null;
+  const readInt = (value) =>
+    Number.isInteger(value) ? value : null;
+  const asObject = (value) =>
+    value && typeof value === "object" ? value : null;
+
   const message = String(diagnostic.message || "").trim();
   if (!message) {
     return null;
   }
+
   const severityRaw = String(diagnostic.severity || "").trim().toLowerCase();
   const severity = severityRaw === "error" ? "error" : "warning";
-  const labels = Array.isArray(diagnostic.labels)
-    ? diagnostic.labels.map((label) => {
-        const span = label && typeof label === "object" ? label.span : null;
-        const start =
-          span && typeof span === "object" && Number.isInteger(span.offset)
-            ? span.offset
-            : null;
-        const length =
-          span && typeof span === "object" && Number.isInteger(span.length)
-            ? span.length
-            : null;
-        return {
-          message:
-            label && typeof label === "object" && typeof label.label === "string"
-              ? label.label
-              : null,
-          start,
-          end:
-            start !== null && length !== null
-              ? start + length
-              : null,
-        };
-      })
-    : [];
+
+  const labels = [];
+  if (Array.isArray(diagnostic.labels)) {
+    for (const label of diagnostic.labels) {
+      const labelObj = asObject(label);
+      const span = asObject(labelObj?.span);
+      const start = readInt(span?.offset);
+      const length = readInt(span?.length);
+      labels.push({
+        message: readString(labelObj?.label),
+        start,
+        end: start !== null && length !== null ? start + length : null,
+      });
+    }
+  }
+
   const code = typeof diagnostic.code === "string" ? diagnostic.code : null;
   return {
     message: code ? `${code}: ${message}` : message,
diff --git a/studio/frontend/src/features/recipe-studio/dialogs/models/model-config-dialog.tsx b/studio/frontend/src/features/recipe-studio/dialogs/models/model-config-dialog.tsx
index 0d2b01fd30..28251bd6f2 100644
--- a/studio/frontend/src/features/recipe-studio/dialogs/models/model-config-dialog.tsx
+++ b/studio/frontend/src/features/recipe-studio/dialogs/models/model-config-dialog.tsx
@@ -1,3 +1,8 @@
+import {
+  Collapsible,
+  CollapsibleContent,
+  CollapsibleTrigger,
+} from "@/components/ui/collapsible";
 import { Checkbox } from "@/components/ui/checkbox";
 import {
   Combobox,
@@ -8,7 +13,8 @@ import {
   ComboboxList,
 } from "@/components/ui/combobox";
 import { Input } from "@/components/ui/input";
-import { type ReactElement, useRef } from "react";
+import { Textarea } from "@/components/ui/textarea";
+import { type ReactElement, useRef, useState } from "react";
 import type { ModelConfig } from "../../types";
 import { FieldLabel } from "../shared/field-label";
 import { NameField } from "../shared/name-field";
@@ -24,11 +30,13 @@ export function ModelConfigDialog({
   providerOptions,
   onUpdate,
 }: ModelConfigDialogProps): ReactElement {
+  const [optionalOpen, setOptionalOpen] = useState(false);
   const modelId = `${config.id}-model`;
   const providerId = `${config.id}-provider`;
   const tempId = `${config.id}-temperature`;
   const topPId = `${config.id}-top-p`;
   const maxTokensId = `${config.id}-max-tokens`;
+  const extraBodyId = `${config.id}-inference-extra-body`;
   const providerAnchorRef = useRef<HTMLDivElement>(null);
   const providerInputRef = useRef(config.provider);
   const lastProviderRef = useRef(config.provider);
@@ -145,15 +153,44 @@ export function ModelConfigDialog({
           />
         </div>
       </div>
-      <label className="flex items-center gap-2 text-xs font-semibold uppercase text-muted-foreground">
-        <Checkbox
-          checked={config.skip_health_check ?? false}
-          onCheckedChange={(value) =>
-            updateField("skip_health_check", Boolean(value))
-          }
-        />
-        Skip health check
-      </label>
+      <Collapsible open={optionalOpen} onOpenChange={setOptionalOpen}>
+        <CollapsibleTrigger asChild={true}>
+          <button
+            type="button"
+            className="flex w-full items-center justify-between text-left text-xs text-muted-foreground"
+          >
+            <span className="font-semibold uppercase">Optional</span>
+            <span>{optionalOpen ? "Hide" : "Show"}</span>
+          </button>
+        </CollapsibleTrigger>
+        <CollapsibleContent className="mt-3 space-y-4">
+          <div className="grid gap-2">
+            <FieldLabel
+              label="Inference extra body (JSON)"
+              htmlFor={extraBodyId}
+              hint="Optional request fields merged into inference parameters."
+            />
+            <Textarea
+              id={extraBodyId}
+              className="corner-squircle nodrag"
+              placeholder='{"top_k": 20, "min_p": 0.0}'
+              value={config.inference_extra_body ?? ""}
+              onChange={(event) =>
+                updateField("inference_extra_body", event.target.value)
+              }
+            />
+          </div>
+          <label className="flex items-center gap-2 text-xs font-semibold uppercase text-muted-foreground">
+            <Checkbox
+              checked={config.skip_health_check ?? false}
+              onCheckedChange={(value) =>
+                updateField("skip_health_check", Boolean(value))
+              }
+            />
+            Skip health check
+          </label>
+        </CollapsibleContent>
+      </Collapsible>
     </div>
   );
 }
diff --git a/studio/frontend/src/features/recipe-studio/types/index.ts b/studio/frontend/src/features/recipe-studio/types/index.ts
index 2ff95b7333..56c1475ee6 100644
--- a/studio/frontend/src/features/recipe-studio/types/index.ts
+++ b/studio/frontend/src/features/recipe-studio/types/index.ts
@@ -244,6 +244,8 @@ export type ModelConfig = {
   // biome-ignore lint/style/useNamingConvention: api schema
   inference_max_tokens?: string;
   // biome-ignore lint/style/useNamingConvention: api schema
+  inference_extra_body?: string;
+  // biome-ignore lint/style/useNamingConvention: api schema
   skip_health_check?: boolean;
 };
 
diff --git a/studio/frontend/src/features/recipe-studio/utils/config-factories.ts b/studio/frontend/src/features/recipe-studio/utils/config-factories.ts
index 941cbdd327..39ef028c5b 100644
--- a/studio/frontend/src/features/recipe-studio/utils/config-factories.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/config-factories.ts
@@ -260,6 +260,8 @@ export function makeModelConfig(
     // biome-ignore lint/style/useNamingConvention: api schema
     inference_top_p: "",
     // biome-ignore lint/style/useNamingConvention: api schema
+    inference_extra_body: "",
+    // biome-ignore lint/style/useNamingConvention: api schema
     skip_health_check: false,
   };
 }
diff --git a/studio/frontend/src/features/recipe-studio/utils/import/parsers/model-parser.ts b/studio/frontend/src/features/recipe-studio/utils/import/parsers/model-parser.ts
index 18632d5c03..8602da9747 100644
--- a/studio/frontend/src/features/recipe-studio/utils/import/parsers/model-parser.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/import/parsers/model-parser.ts
@@ -56,6 +56,10 @@ export function parseModelConfig(
     // biome-ignore lint/style/useNamingConvention: api schema
     inference_max_tokens: readNumberString(inference.max_tokens),
     // biome-ignore lint/style/useNamingConvention: api schema
+    inference_extra_body: isRecord(inference.extra_body)
+      ? JSON.stringify(inference.extra_body, null, 2)
+      : "",
+    // biome-ignore lint/style/useNamingConvention: api schema
     skip_health_check:
       typeof model.skip_health_check === "boolean"
         ? model.skip_health_check
diff --git a/studio/frontend/src/features/recipe-studio/utils/payload/build-payload.ts b/studio/frontend/src/features/recipe-studio/utils/payload/build-payload.ts
index 64aaac4015..f037586af7 100644
--- a/studio/frontend/src/features/recipe-studio/utils/payload/build-payload.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/payload/build-payload.ts
@@ -230,7 +230,7 @@ export function buildRecipePayload(
       modelProviderConfigs.push(config);
       continue;
     }
-    modelConfigs.push(buildModelConfig(config));
+    modelConfigs.push(buildModelConfig(config, errors));
     modelConfigConfigs.push(config);
   }
 
diff --git a/studio/frontend/src/features/recipe-studio/utils/payload/builders-model.ts b/studio/frontend/src/features/recipe-studio/utils/payload/builders-model.ts
index b3d361bb75..3a96b2c8d0 100644
--- a/studio/frontend/src/features/recipe-studio/utils/payload/builders-model.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/payload/builders-model.ts
@@ -31,11 +31,19 @@ export function buildModelProvider(
   };
 }
 
-export function buildModelConfig(config: ModelConfig): Record<string, unknown> {
+export function buildModelConfig(
+  config: ModelConfig,
+  errors: string[],
+): Record<string, unknown> {
   const inference: Record<string, unknown> = {};
   const temp = config.inference_temperature?.trim();
   const topP = config.inference_top_p?.trim();
   const maxTokens = config.inference_max_tokens?.trim();
+  const extraBody = parseJsonObject(
+    config.inference_extra_body,
+    `Model ${config.name} inference extra_body`,
+    errors,
+  );
 
   if (temp) {
     const parsed = Number(temp);
@@ -57,6 +65,10 @@ export function buildModelConfig(config: ModelConfig): Record<string, unknown> {
       inference.max_tokens = parsed;
     }
   }
+  if (extraBody) {
+    // biome-ignore lint/style/useNamingConvention: api schema
+    inference.extra_body = extraBody;
+  }
 
   return {
     alias: config.name,