diff --git a/src/app/api/image-generation/route.ts b/src/app/api/image-generation/route.ts
new file mode 100644
index 0000000..822bb3d
--- /dev/null
+++ b/src/app/api/image-generation/route.ts
@@ -0,0 +1,74 @@
+import { type NextRequest, NextResponse } from "next/server";
+import { requireActor, requireAdmin } from "@/lib/server/actor";
+import { configApiFetch } from "@/lib/server/evoscientistConfigClient";
+import { isCrossOrigin } from "@/lib/server/workspace";
+import { NO_STORE, routeErrorResponse } from "@/lib/server/routeErrors";
+import type {
+  ImageGenerationSettings,
+  PutImageGenerationRequest,
+} from "@/lib/imageGeneration";
+
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+
+export async function GET(request: NextRequest) {
+  try {
+    if (isCrossOrigin(request)) {
+      return NextResponse.json(
+        { code: "FORBIDDEN", message: "Cross-origin access is not allowed." },
+        { status: 403, headers: NO_STORE }
+      );
+    }
+    const actor = requireActor(request);
+    requireAdmin(actor);
+    const { body } = await configApiFetch<ImageGenerationSettings>(
+      actor,
+      "/api/image-generation"
+    );
+    return NextResponse.json(body, { headers: NO_STORE });
+  } catch (error) {
+    return routeErrorResponse(error);
+  }
+}
+
+export async function PUT(request: NextRequest) {
+  try {
+    if (isCrossOrigin(request)) {
+      return NextResponse.json(
+        { code: "FORBIDDEN", message: "Cross-origin access is not allowed." },
+        { status: 403, headers: NO_STORE }
+      );
+    }
+    const actor = requireActor(request);
+    requireAdmin(actor);
+    const payload = (await request
+      .json()
+      .catch(() => null)) as PutImageGenerationRequest | null;
+    if (
+      !payload ||
+      typeof payload !== "object" ||
+      !Array.isArray(payload.models)
+    ) {
+      return NextResponse.json(
+        {
+          code: "INVALID_REQUEST",
+          message: "default_model, timeout_seconds and models are required.",
+        },
+        { status: 400, headers: NO_STORE }
+      );
+    }
+    const body: PutImageGenerationRequest = {
+      default_model: payload.default_model,
+      timeout_seconds: payload.timeout_seconds,
+      models: payload.models,
+    };
+    const { body: saved } = await configApiFetch<ImageGenerationSettings>(
+      actor,
+      "/api/image-generation",
+      { method: "PUT", body }
+    );
+    return NextResponse.json(saved, { headers: NO_STORE });
+  } catch (error) {
+    return routeErrorResponse(error);
+  }
+}
diff --git a/src/app/components/ImageModelsDialog.tsx b/src/app/components/ImageModelsDialog.tsx
new file mode 100644
index 0000000..64016a1
--- /dev/null
+++ b/src/app/components/ImageModelsDialog.tsx
@@ -0,0 +1,44 @@
+"use client";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { ImageModelsEditor } from "@/app/components/ImageModelsEditor";
+
+interface ImageModelsDialogProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+}
+
+export function ImageModelsDialog({ open, onOpenChange }: ImageModelsDialogProps) {
+  return (
+    <Dialog
+      open={open}
+      onOpenChange={onOpenChange}
+    >
+      <DialogContent
+        className="sm:max-w-4xl"
+        onPointerDownOutside={(event) => event.preventDefault()}
+        onInteractOutside={(event) => event.preventDefault()}
+        onEscapeKeyDown={(event) => event.preventDefault()}
+      >
+        <DialogHeader>
+          <DialogTitle>Image models</DialogTitle>
+          <DialogDescription>
+            Manage dedicated image-generation models (stored in config.yaml).
+            Admin only.
+          </DialogDescription>
+        </DialogHeader>
+        {open && <ImageModelsEditor />}
+        <DialogFooter>
+          <Button onClick={() => onOpenChange(false)}>Close</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
diff --git a/src/app/components/ImageModelsEditor.tsx b/src/app/components/ImageModelsEditor.tsx
new file mode 100644
index 0000000..2f59090
--- /dev/null
+++ b/src/app/components/ImageModelsEditor.tsx
@@ -0,0 +1,493 @@
+"use client";
+
+import { useCallback, useEffect, useMemo, useState } from "react";
+import { Eye, EyeOff } from "lucide-react";
+import { toast } from "sonner";
+import { Button } from "@/components/ui/button";
+import {
+  getImageGeneration,
+  newImageModelDraft,
+  putImageGeneration,
+  type ImageGenerationSettings,
+  type ImageModel,
+  type ImageModelStatus,
+  type PutImageGenerationRequest,
+} from "@/lib/imageGeneration";
+
+const inputClass =
+  "w-full rounded-md border border-border bg-background px-2 py-1 text-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring disabled:opacity-60";
+
+const SIZE_OPTIONS = ["1024x1024", "1536x1024", "1024x1536"];
+
+function Field({
+  label,
+  hint,
+  children,
+}: {
+  label: string;
+  hint?: string;
+  children: React.ReactNode;
+}) {
+  return (
+    <label className="block space-y-0.5">
+      <span className="text-xs font-medium text-muted-foreground">{label}</span>
+      {children}
+      {hint && (
+        <span className="block text-[11px] text-muted-foreground">{hint}</span>
+      )}
+    </label>
+  );
+}
+
+/** Editable model state: the masked GET shape plus the raw params JSON text. */
+type ModelDraft = ImageModelStatus & { paramsText: string };
+
+interface DraftState {
+  default_model: string;
+  timeout_seconds: number;
+  models: ModelDraft[];
+}
+
+function toModelDraft(model: ImageModelStatus): ModelDraft {
+  return {
+    ...model,
+    paramsText:
+      model.params && Object.keys(model.params).length > 0
+        ? JSON.stringify(model.params, null, 2)
+        : "",
+  };
+}
+
+function toDraftState(settings: ImageGenerationSettings): DraftState {
+  return {
+    default_model: settings.default_model,
+    timeout_seconds: settings.timeout_seconds,
+    models: settings.models.map(toModelDraft),
+  };
+}
+
+type ParsedParams =
+  | { ok: true; value: Record<string, unknown> }
+  | { ok: false; message: string };
+
+function parseParams(text: string): ParsedParams {
+  const trimmed = text.trim();
+  if (!trimmed) return { ok: true, value: {} };
+  try {
+    const parsed: unknown = JSON.parse(trimmed);
+    if (parsed === null || typeof parsed !== "object" || Array.isArray(parsed)) {
+      return { ok: false, message: "params must be a JSON object" };
+    }
+    return { ok: true, value: parsed as Record<string, unknown> };
+  } catch {
+    return { ok: false, message: "invalid JSON" };
+  }
+}
+
+/** Build the PUT payload; returns null when any params text is invalid. */
+function buildPayload(draft: DraftState): PutImageGenerationRequest | null {
+  const models: ImageModel[] = [];
+  for (const model of draft.models) {
+    const params = parseParams(model.paramsText);
+    if (!params.ok) return null;
+    models.push({
+      id: model.id,
+      name: model.name,
+      provider: model.provider,
+      api_key: model.api_key,
+      base_url: model.base_url,
+      supports_generation: model.supports_generation,
+      supports_edit: model.supports_edit,
+      default_size: model.default_size,
+      default_quality: model.default_quality,
+      params: params.value,
+    });
+  }
+  return {
+    default_model: draft.default_model,
+    timeout_seconds: draft.timeout_seconds,
+    models,
+  };
+}
+
+function ImageModelCard({
+  model,
+  onChange,
+  onRemove,
+}: {
+  model: ModelDraft;
+  onChange: (next: ModelDraft) => void;
+  onRemove: () => void;
+}) {
+  const [showKey, setShowKey] = useState(false);
+  const paramsResult = parseParams(model.paramsText);
+  const paramsError = paramsResult.ok ? null : paramsResult.message;
+
+  return (
+    <div className="space-y-2 rounded-md border border-border p-3">
+      <div className="flex flex-wrap items-center gap-2">
+        <span className="font-mono text-sm font-medium">
+          {model.id || "(new model)"}
+        </span>
+        <span className="rounded bg-accent px-1.5 py-0.5 text-[11px] text-muted-foreground">
+          {model.provider}
+        </span>
+        <span className="flex-1" />
+        <label className="flex items-center gap-1 text-xs">
+          <input
+            type="checkbox"
+            checked={model.supports_generation}
+            onChange={(event) =>
+              onChange({ ...model, supports_generation: event.target.checked })
+            }
+          />
+          generation
+        </label>
+        <label className="flex items-center gap-1 text-xs">
+          <input
+            type="checkbox"
+            checked={model.supports_edit}
+            onChange={(event) =>
+              onChange({ ...model, supports_edit: event.target.checked })
+            }
+          />
+          edit
+        </label>
+        <Button type="button" variant="outline" size="sm" onClick={onRemove}>
+          Remove
+        </Button>
+      </div>
+      <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
+        <Field label="Model id">
+          <input
+            type="text"
+            className={inputClass}
+            value={model.id}
+            onChange={(event) => onChange({ ...model, id: event.target.value })}
+          />
+        </Field>
+        <Field label="Display name">
+          <input
+            type="text"
+            className={inputClass}
+            value={model.name}
+            onChange={(event) =>
+              onChange({ ...model, name: event.target.value })
+            }
+          />
+        </Field>
+        <Field label="Provider">
+          <select
+            className={inputClass}
+            value={model.provider}
+            onChange={(event) =>
+              onChange({
+                ...model,
+                provider: event.target.value === "gemini" ? "gemini" : "openai",
+              })
+            }
+          >
+            <option value="openai">openai</option>
+            <option value="gemini">gemini</option>
+          </select>
+        </Field>
+      </div>
+      <Field label="Base URL">
+        <input
+          type="text"
+          className={inputClass}
+          value={model.base_url}
+          placeholder="https://api.example.com/v1"
+          onChange={(event) =>
+            onChange({ ...model, base_url: event.target.value })
+          }
+        />
+      </Field>
+      <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
+        <Field label="Default size">
+          <select
+            className={inputClass}
+            value={model.default_size}
+            onChange={(event) =>
+              onChange({ ...model, default_size: event.target.value })
+            }
+          >
+            {SIZE_OPTIONS.map((size) => (
+              <option key={size} value={size}>
+                {size}
+              </option>
+            ))}
+            {!SIZE_OPTIONS.includes(model.default_size) && (
+              <option value={model.default_size}>{model.default_size}</option>
+            )}
+          </select>
+        </Field>
+        <Field label="Default quality">
+          <input
+            type="text"
+            className={inputClass}
+            value={model.default_quality}
+            placeholder="auto"
+            onChange={(event) =>
+              onChange({ ...model, default_quality: event.target.value })
+            }
+          />
+        </Field>
+        <Field
+          label="API Key"
+          hint={
+            model.api_key_configured
+              ? `configured${model.api_key_hint ? ` (${model.api_key_hint})` : ""} — leave blank to keep`
+              : "paste your API key"
+          }
+        >
+          <div className="relative">
+            <input
+              type={showKey ? "text" : "password"}
+              className={`${inputClass} pr-8`}
+              value={model.api_key}
+              autoComplete="new-password"
+              placeholder={model.api_key_hint ?? "sk-..."}
+              onChange={(event) =>
+                onChange({ ...model, api_key: event.target.value })
+              }
+            />
+            <button
+              type="button"
+              aria-label={showKey ? "Hide API key" : "Show API key"}
+              className="absolute right-2 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
+              onClick={() => setShowKey((current) => !current)}
+            >
+              {showKey ? <EyeOff size={16} /> : <Eye size={16} />}
+            </button>
+          </div>
+        </Field>
+      </div>
+      <Field label="Params (JSON object, optional)">
+        <textarea
+          className={`${inputClass} font-mono text-xs`}
+          rows={2}
+          value={model.paramsText}
+          placeholder='{"quality": "high"}'
+          spellCheck={false}
+          onChange={(event) =>
+            onChange({ ...model, paramsText: event.target.value })
+          }
+        />
+      </Field>
+      {paramsError && (
+        <p role="alert" className="text-[11px] text-destructive">
+          Params: {paramsError}
+        </p>
+      )}
+    </div>
+  );
+}
+
+export function ImageModelsEditor() {
+  const [data, setData] = useState<ImageGenerationSettings | null>(null);
+  const [draft, setDraft] = useState<DraftState | null>(null);
+  const [loadError, setLoadError] = useState<string | null>(null);
+  const [forbidden, setForbidden] = useState(false);
+  const [saving, setSaving] = useState(false);
+
+  const load = useCallback(async () => {
+    setLoadError(null);
+    try {
+      const settings = await getImageGeneration();
+      setForbidden(false);
+      setData(settings);
+      setDraft(toDraftState(settings));
+    } catch (reason) {
+      const message =
+        reason instanceof Error
+          ? reason.message
+          : "Failed to load image models.";
+      if (message.includes("(403)")) {
+        setForbidden(true);
+      } else {
+        setLoadError(message);
+      }
+    }
+  }, []);
+
+  useEffect(() => {
+    void load();
+  }, [load]);
+
+  const dirty = useMemo(() => {
+    if (!data || !draft) return false;
+    const draftPayload = buildPayload(draft);
+    const savedPayload = buildPayload(toDraftState(data));
+    return JSON.stringify(draftPayload) !== JSON.stringify(savedPayload);
+  }, [data, draft]);
+
+  const save = useCallback(async () => {
+    if (!draft) return;
+    const payload = buildPayload(draft);
+    if (!payload) {
+      toast.error("Fix the invalid params JSON before saving.");
+      return;
+    }
+    setSaving(true);
+    try {
+      const saved = await putImageGeneration(payload);
+      setData(saved);
+      setDraft(toDraftState(saved));
+      toast.success("Image models saved.");
+    } catch (reason) {
+      toast.error(
+        reason instanceof Error ? reason.message : "Failed to save image models."
+      );
+    } finally {
+      setSaving(false);
+    }
+  }, [draft]);
+
+  if (forbidden) {
+    return (
+      <p className="rounded-md border border-border px-4 py-3 text-sm text-muted-foreground">
+        Image model configuration requires an admin account.
+      </p>
+    );
+  }
+  if (loadError) {
+    return (
+      <div className="space-y-2 rounded-md border border-destructive/30 bg-destructive/5 px-4 py-3 text-sm">
+        <p role="alert">{loadError}</p>
+        <Button
+          type="button"
+          variant="outline"
+          size="sm"
+          onClick={() => void load()}
+        >
+          Retry
+        </Button>
+      </div>
+    );
+  }
+  if (!data || !draft) {
+    return <p className="text-sm text-muted-foreground">Loading image models…</p>;
+  }
+
+  const defaultOptions = draft.models.map((model) => model.id);
+
+  return (
+    <div className="space-y-4">
+      <div className="grid grid-cols-1 gap-2 rounded-lg border border-border p-4 sm:grid-cols-2">
+        <Field label="Default model">
+          <select
+            className={inputClass}
+            value={draft.default_model}
+            onChange={(event) =>
+              setDraft({ ...draft, default_model: event.target.value })
+            }
+          >
+            <option value="">— none —</option>
+            {defaultOptions.map((id) => (
+              <option key={id} value={id}>
+                {id}
+              </option>
+            ))}
+            {draft.default_model &&
+              !defaultOptions.includes(draft.default_model) && (
+                <option value={draft.default_model}>
+                  {draft.default_model}
+                </option>
+              )}
+          </select>
+        </Field>
+        <Field label="Timeout (s)">
+          <input
+            type="number"
+            className={inputClass}
+            value={draft.timeout_seconds}
+            min={0}
+            step={1}
+            onChange={(event) => {
+              const parsed = Number(event.target.value);
+              if (Number.isNaN(parsed)) return;
+              setDraft({ ...draft, timeout_seconds: Math.trunc(parsed) });
+            }}
+          />
+        </Field>
+      </div>
+
+      <div className="space-y-2">
+        <div className="flex items-center justify-between">
+          <p className="text-xs font-medium text-muted-foreground">Models</p>
+          <Button
+            type="button"
+            variant="outline"
+            size="sm"
+            onClick={() =>
+              setDraft({
+                ...draft,
+                models: [
+                  ...draft.models,
+                  {
+                    ...newImageModelDraft(draft.models),
+                    api_key_configured: false,
+                    api_key_hint: null,
+                    paramsText: "",
+                  },
+                ],
+              })
+            }
+          >
+            Add model
+          </Button>
+        </div>
+        {draft.models.length === 0 && (
+          <p className="text-xs text-muted-foreground">No models yet.</p>
+        )}
+        {draft.models.map((model, index) => (
+          <ImageModelCard
+            key={`${index}-${model.id}`}
+            model={model}
+            onChange={(next) =>
+              setDraft({
+                ...draft,
+                models: draft.models.map((current, i) =>
+                  i === index ? next : current
+                ),
+              })
+            }
+            onRemove={() =>
+              setDraft({
+                ...draft,
+                models: draft.models.filter((_, i) => i !== index),
+              })
+            }
+          />
+        ))}
+      </div>
+
+      <div className="flex items-center gap-2 border-t border-border pt-3">
+        <Button
+          type="button"
+          onClick={() => void save()}
+          disabled={saving || !dirty}
+        >
+          {saving ? "Saving…" : "Save"}
+        </Button>
+        <Button
+          type="button"
+          variant="outline"
+          disabled={saving || !dirty}
+          onClick={() => setDraft(toDraftState(data))}
+        >
+          Discard changes
+        </Button>
+        {dirty && (
+          <span className="rounded bg-[var(--color-warning)]/10 px-1.5 py-0.5 text-xs text-[var(--color-warning)]">
+            unsaved changes
+          </span>
+        )}
+      </div>
+      <p className="text-[11px] text-muted-foreground">
+        API keys are write-only: leave the field blank to keep the stored key.
+      </p>
+    </div>
+  );
+}
diff --git a/src/app/page.tsx b/src/app/page.tsx
index fd8c2e2..7e6e9bf 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -6,6 +6,7 @@ import { useQueryState } from "nuqs";
 import { AccountDialog } from "@/app/components/AccountDialog";
 import { ChangePasswordDialog } from "@/app/components/ChangePasswordDialog";
 import { ConfigDialog } from "@/app/components/ConfigDialog";
+import { ImageModelsDialog } from "@/app/components/ImageModelsDialog";
 import { Button } from "@/components/ui/button";
 import {
   DropdownMenu,
@@ -20,6 +21,7 @@ import type { Assistant } from "@langchain/langgraph-sdk";
 import {
   KeyRound,
   Settings,
+  Image as ImageIcon,
   SquarePen,
   PanelLeft,
   PanelLeftClose,
@@ -71,6 +73,7 @@ function HomePageInner({ authEnabled }: HomePageInnerProps) {
   const [accountDialogOpen, setAccountDialogOpen] = useState(false);
   const [changePasswordOpen, setChangePasswordOpen] = useState(false);
   const [modelConfigOpen, setModelConfigOpen] = useState(false);
+  const [imageModelsOpen, setImageModelsOpen] = useState(false);
   // "Submit a message on the main thread" — registered by ChatInterface (only
   // while it's mounted, i.e. on the chat view), used by the Agents board to loop
   // an async result back to the main agent. Null when not on the chat view.
@@ -285,6 +288,10 @@ function HomePageInner({ authEnabled }: HomePageInnerProps) {
         open={modelConfigOpen}
         onOpenChange={setModelConfigOpen}
       />
+      <ImageModelsDialog
+        open={imageModelsOpen}
+        onOpenChange={setImageModelsOpen}
+      />
       <div className="flex h-screen flex-col">
         <header className="flex h-14 items-center justify-between gap-2 border-b border-border px-2.5 sm:px-4">
           <div className="flex min-w-0 items-center gap-2 sm:gap-3">
@@ -385,6 +392,19 @@ function HomePageInner({ authEnabled }: HomePageInnerProps) {
                 />
               )}
             </Button>
+            <Button
+              variant="ghost"
+              size="icon"
+              onClick={() => setImageModelsOpen(true)}
+              aria-label="Image models"
+              title="Image models"
+              className="size-8"
+            >
+              <ImageIcon
+                className="size-5"
+                aria-hidden="true"
+              />
+            </Button>
             <DropdownMenu modal={false}>
               <DropdownMenuTrigger asChild>
                 <Button
diff --git a/src/lib/imageGeneration.ts b/src/lib/imageGeneration.ts
new file mode 100644
index 0000000..8e26455
--- /dev/null
+++ b/src/lib/imageGeneration.ts
@@ -0,0 +1,73 @@
+export interface ImageModel {
+  id: string;
+  name: string;
+  provider: "openai" | "gemini";
+  api_key: string;
+  base_url: string;
+  supports_generation: boolean;
+  supports_edit: boolean;
+  default_size: string;
+  default_quality: string;
+  params: Record<string, unknown>;
+}
+
+export interface ImageModelStatus extends Omit<ImageModel, "api_key"> {
+  api_key: string; // always "" from GET
+  api_key_configured: boolean;
+  api_key_hint: string | null;
+}
+
+export interface ImageGenerationSettings {
+  default_model: string;
+  timeout_seconds: number;
+  models: ImageModelStatus[];
+}
+
+export interface PutImageGenerationRequest {
+  default_model: string;
+  timeout_seconds: number;
+  models: ImageModel[];
+}
+
+export async function getImageGeneration(): Promise<ImageGenerationSettings> {
+  const response = await fetch("/api/image-generation", { cache: "no-store" });
+  if (!response.ok) throw new Error(`Failed to load image models (${response.status})`);
+  return response.json();
+}
+
+export async function putImageGeneration(
+  payload: PutImageGenerationRequest
+): Promise<ImageGenerationSettings> {
+  const response = await fetch("/api/image-generation", {
+    method: "PUT",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(payload),
+  });
+  if (!response.ok) {
+    const body = await response.json().catch(() => null);
+    throw new Error(body?.message ?? `Save failed (${response.status})`);
+  }
+  return response.json();
+}
+
+export function newImageModelDraft(existing: ImageModel[]): ImageModel {
+  let index = existing.length + 1;
+  let id = `image-model-${index}`;
+  const ids = new Set(existing.map((model) => model.id));
+  while (ids.has(id)) {
+    index += 1;
+    id = `image-model-${index}`;
+  }
+  return {
+    id,
+    name: "",
+    provider: "openai",
+    api_key: "",
+    base_url: "",
+    supports_generation: true,
+    supports_edit: true,
+    default_size: "1024x1024",
+    default_quality: "auto",
+    params: {},
+  };
+}