diff --git a/bin/icon.ts b/bin/icon.ts
index 1fa8cda..0bed686 100755
--- a/bin/icon.ts
+++ b/bin/icon.ts
@@ -47,7 +47,7 @@ const USAGE = `Usage:
   icon style   <${Object.keys(STYLES).join('|')}|agentic|all> [DRAW OPTIONS]
 
   DRAW OPTIONS: [--out DIR] [--only mail,…] [--no-draw] [--draw-only] [--force]
-                [--concurrency N] [--quality low|medium|high]
+                [--concurrency N] [--quality low|medium|high] [--model M]
                 [--style-dir DIR] [--dry-run]
 
 A colour style draws every UI icon with an image model (needs OPENAI_API_KEY),
@@ -133,7 +133,7 @@ if (isMain(import.meta.url)) {
   try {
     const { flags, values, positional } = parseArgs(process.argv.slice(2), {
       boolean: ['--json', '--help', '--no-draw', '--draw-only', '--force', '--dry-run'],
-      string: ['-o', '--out', '--sizes', '--color', '--only', '--category', '--mode', '--concurrency', '--quality', '--style-dir'],
+      string: ['-o', '--out', '--sizes', '--color', '--only', '--category', '--mode', '--concurrency', '--quality', '--style-dir', '--model'],
     });
     const [verb, ...rest] = positional;
     if (flags.has('--help') || !verb) {
@@ -275,6 +275,7 @@ if (isMain(import.meta.url)) {
               styleDir: values.get('--style-dir') ?? join(process.env['HOME'] ?? '', 'brand-assets', 'openemoji', 'master'),
               concurrency: Number(values.get('--concurrency') ?? HQ_CONCURRENCY),
               quality,
+              ...(values.get('--model') ? { model: values.get('--model')! } : {}),
               force: flags.has('--force'),
               log: (line) => process.stderr.write(`${line}\n`),
               render: (svg, size) => Buffer.from(new Resvg(svg, { fitTo: { mode: 'width', value: size } }).render().asPng()),
diff --git a/src/icon-hq.ts b/src/icon-hq.ts
index 8cc808e..e4e0e21 100644
--- a/src/icon-hq.ts
+++ b/src/icon-hq.ts
@@ -118,6 +118,12 @@ export interface HqDrawOptions {
   styleDir: string;
   concurrency: number;
   quality: string;
+  /**
+   * The image model; HQ_MODEL when absent. gpt-image-2 now answers
+   * "Transparent background is not supported for this model", so a top-up
+   * drawing (a new icon after the set shipped) needs one that still does.
+   */
+  model?: string;
   force: boolean;
   log: (line: string) => void;
   render: (svg: string, size: number) => Promise<Buffer> | Buffer;
@@ -202,7 +208,7 @@ export async function drawHq(options: HqDrawOptions): Promise<HqDrawReport> {
       try {
         report.calls += 1;
         const result = await options.caller({
-          model: HQ_MODEL,
+          model: options.model ?? HQ_MODEL,
           // A brand takes no style reference: the mark is the only thing the
           // model should be looking at, and an emoji master beside it is an
           // invitation to redraw.
@@ -213,7 +219,7 @@ export async function drawHq(options: HqDrawOptions): Promise<HqDrawReport> {
         await writeFile(join(master, `${key}.png`), result.png);
         await writeFile(
           join(options.out, style.dir, 'prompts.jsonl'),
-          `${JSON.stringify({ key, style: style.id, prompt, brand: Boolean(brand), references: brand ? ['mark'] : ['line', ...style.emojiRefs] })}\n`,
+          `${JSON.stringify({ key, style: style.id, model: options.model ?? HQ_MODEL, prompt, brand: Boolean(brand), references: brand ? ['mark'] : ['line', ...style.emojiRefs] })}\n`,
           { flag: 'a' },
         );
         report.drawn.push(key);