Qwen Image 2.1 Pro text-to-image turns a written brief into one to six images on Alibaba's hosted Pro tier of Qwen Image 2.1. Fifteen aspect ratios, 1k to 2K at one flat price per image, no content filter, and prompt expansion off by default so your wording is followed.
Examples use the selected endpoint’s public parameter definitions. Replace the API key and example media, then send the request from your server.
SDKs & integrations
https://api.spicyapi.ai/api/v1/jobs/createTaskKeep the API key in the server environment variable SPICY_API_KEY. Use Bearer authentication and Content-Type: application/json for JSON requests.
Authorization: Bearer $SPICY_API_KEY
# Generate the idempotency key once; reuse it when retrying after a lost response.
export SPICY_IDEMPOTENCY_KEY="${SPICY_IDEMPOTENCY_KEY:-$(uuidgen)}"
curl -X POST https://api.spicyapi.ai/api/v1/jobs/createTask \
-H "Authorization: Bearer $SPICY_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $SPICY_IDEMPOTENCY_KEY" \
-d '{
"model": "alibaba/qwen-image-2.1-pro/text-to-image",
"input": {
"prompt": "A ceramic teapot on a linen cloth, soft window light, muted palette",
"resolution": "2k",
"num_outputs": 1,
"aspect_ratio": "1:1",
"prompt_optimization_mode": "direct"
}
}'
# Copy data.taskId from the response into TASK_ID, then poll the status.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.spicyapi.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
-H "Authorization: Bearer $SPICY_API_KEY"Generated from this model’s input schema — the same one the API validates every request against.
Place these fields inside the request body’s input object. Names and types match the API. Do not assume a default when none is specified.
promptstringRequiredThe whole brief, up to 5,000 characters. Write subject, wardrobe, pose, light and lens in plain sentences. There is no negative prompt, so put anything to leave out in the same text.
seedintegerOptionalSteadies a draw so you can change one thing at a time and compare fairly. It does not guarantee a pixel-identical image. Keep the returned file when you need that exact frame again.
prompt_optimization_modestringOptionalHow expansion rewrites the brief when it is on: direct is a single pass that suits most prompts, agent a multi-step rewrite with finer detail. Ignored while expansion is off. Does not change the price.
"direct""agent"enable_thinkingbooleanOptionalSpends extra reasoning on the rewrite for a better image, at the cost of a longer wait. Only works while prompt expansion is on. Does not change the price.
enable_prompt_expansionbooleanOptionalOff by default, so your wording is drawn as written. On, Alibaba rewrites the prompt into a fuller scene first, which helps short everyday prompts but can tone bolder prompts down. Does not change the price.
num_outputsintegerOptionalAffects priceOne to six images from the same prompt in one request. Each image returned is billed, so six images cost six times one.
resolutionstringOptional1k, 1.5k or 2k. Every tier costs the same per image, so 2k is the default.
"1k""1.5k""2k"aspect_ratiostringOptionalFifteen shapes, from 3:1 and 21:9 strips to 1:3 and 9:21 columns. The frame is composed at that shape, not cropped from a square.
"1:1""16:9""9:16""4:3""3:4""3:2""2:3""21:9""9:21""2:1""1:2""3:1""1:3""5:4""4:5"{
"type": "object",
"required": [
"prompt"
],
"x-pricing": {
"billingMode": "formula",
"variantFields": []
},
"properties": {
"seed": {
"type": "integer",
"x-ui": {
"order": 10,
"widget": "number"
},
"maximum": 2147483647,
"minimum": 0,
"description": "Random seed for controlled comparisons."
},
"prompt": {
"type": "string",
"x-ui": {
"order": 100,
"widget": "textarea"
},
"maxLength": 5000,
"minLength": 1,
"description": "Describe the subject, composition, lighting, and any wording to render. There is no negative prompt: write what to leave out directly in the prompt."
},
"resolution": {
"enum": [
"1k",
"1.5k",
"2k"
],
"type": "string",
"x-ui": {
"order": 70,
"widget": "radio",
"affects_price": false
},
"default": "2k",
"description": "Output resolution tier. Every tier costs the same."
},
"num_outputs": {
"type": "integer",
"x-ui": {
"order": 60,
"widget": "number",
"affects_price": true
},
"default": 1,
"maximum": 6,
"minimum": 1,
"description": "How many images to generate in one request (1 to 6). Billed per image returned."
},
"aspect_ratio": {
"enum": [
"1:1",
"16:9",
"9:16",
"4:3",
"3:4",
"3:2",
"2:3",
"21:9",
"9:21",
"2:1",
"1:2",
"3:1",
"1:3",
"5:4",
"4:5"
],
"type": "string",
"x-ui": {
"order": 80,
"widget": "select"
},
"default": "1:1",
"description": "Output aspect ratio."
},
"enable_thinking": {
"type": "boolean",
"x-ui": {
"order": 30,
"widget": "switch"
},
"default": true,
"description": "Spend extra reasoning on the rewrite for better images, at the cost of a longer wait. Only works while prompt expansion is on."
},
"enable_prompt_expansion": {
"type": "boolean",
"x-ui": {
"order": 31,
"widget": "switch"
},
"default": false,
"description": "Let the service rewrite and expand the prompt before generating. Off by default so the prompt is followed word for word; the rewrite tends to tone explicit requests down."
},
"prompt_optimization_mode": {
"enum": [
"direct",
"agent"
],
"type": "string",
"x-ui": {
"order": 29,
"widget": "radio",
"advanced": true,
"affects_price": false
},
"default": "direct",
"description": "How prompt expansion rewrites the brief: direct is a single pass that suits most prompts; agent is a multi-step rewrite with finer detail."
}
},
"additionalProperties": false
}HTTP 202 means the task was accepted, not completed. Save the returned taskId and query that task. Do not create another task while waiting for its result.
HTTP/1.1 202 Accepted
Location: /api/v1/jobs/recordInfo?taskId=job_01k3m8x9q2z4v7n5p6r8s0t1w3
{
"code": 200,
"msg": "success",
"request_id": "req_example_create",
"data": {
"taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
"state": "queued",
"estimatedCost": "0.750000"
}
}The accepted response includes the estimate so your app can show the same amount in task history and billing.
curl --get "https://api.spicyapi.ai/api/v1/jobs/recordInfo" \
--data-urlencode "taskId=$TASK_ID" \
-H "Authorization: Bearer $SPICY_API_KEY"Start polling at about 2 seconds and gradually increase the interval. Stop at a terminal state. After a connection failure, query the original taskId. Retry creation only with the original idempotency key and body.
import { verifyWebhook } from "@spicyapi/sdk";
// express.raw keeps the bytes we signed; express.json never matches.
app.post("/hooks/spicy", express.raw({ type: "application/json" }), (req, res) => {
const { payload } = verifyWebhook({
rawBody: req.body,
timestamp: req.header("X-Webhook-Timestamp"),
signature: req.header("X-Webhook-Signature"),
payloadVersion: Number(req.header("X-Webhook-Payload-Version")),
secret: process.env.SPICY_WEBHOOK_SECRET,
});
res.status(200).end();
void handleFinishedTask(payload);
});Pass callBackUrl when you create the task and the finished record is POSTed to you — no polling loop at all. Every delivery carries X-Webhook-Timestamp, X-Webhook-Signature and X-Webhook-Payload-Version. The signature is a base64 HMAC-SHA256 over taskId.timestamp.sha256(body), so it must be checked against the raw bytes: parsing the JSON and re-serialising it changes them and the check will fail. Failed deliveries are retried, so the same taskId can arrive twice — make the handler idempotent. Answer 2xx first and do the work afterwards; a slow handler is treated as a failed delivery.
Consume output only when state is succeeded. On failure, use errorCode, errorMessage and request_id to investigate. Example costs and states do not represent an actual bill.
{
"code": 200,
"msg": "success",
"request_id": "req_example_record",
"data": {
"taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
"model": "alibaba/qwen-image-2.1-pro/text-to-image",
"state": "succeeded",
"output": {
"assets": [
{
"key": "tasks/2026/08/28/job_01k3m8x9q2z4v7n5p6r8s0t1w3/3f7a1c9e5b2d48f0a6c1e3d5b7f9a1c3.png",
"mime": "image/png",
"url": "https://example.r2.cloudflarestorage.com/results/job_01k3m8x9q2z4v7n5p6r8s0t1w3/result.png?X-Amz-Signature=SIGNATURE_FROM_RESPONSE",
"expiresAt": "2026-08-28T12:20:08.000Z"
}
]
},
"cost": "0.750000",
"settled": true,
"createdAt": "2026-08-28T12:00:00Z",
"completedAt": "2026-08-28T12:00:30Z"
}
}For each available asset, open or download assets[].url directly without an API Authorization header. The signed URL expires at expiresAt; poll the task again to refresh it while the asset remains within its retention period. A pending or unavailable asset has no URL. Treat signed URLs as private.
Use SpicyAPI in your app, terminal, AI assistant or visual workflow. Choose a setup guide below.
You do not have to write any of the code above. Connect the MCP server once and any agent that speaks MCP — Claude Code, Codex, Cursor, Windsurf, VS Code, Gemini CLI, Cline, LibreChat — can run this model by name, or run it from your shell with a single command.
Use alibaba/qwen-image-2.1-pro/text-to-image to generate a portrait of a dancer under neon light, and save it to ./out/.
The agent looks the model up in the live catalogue, uploads the local file for you, then shows the exact quote and its maximum charge and waits for your confirmation. Nothing is billed until you say yes.
claude mcp add spicyapi -e SPICY_API_KEY=$SPICY_API_KEY \
-- npx --yes --package=@spicyapi/mcp spicyapi-mcp
npx skills add spicyapi-ai/spicy-skillThe first line gives the agent the tools; the second gives it the Skill — the operating rules for them, so it quotes before it bills, uploads local files instead of pasting bytes, and reads the finished asset URL rather than guessing. Every other client takes the same server through its own config file: see the developer hub.
npx @spicyapi/cli tasks create --model alibaba/qwen-image-2.1-pro/text-to-image \
--input-json '{"prompt":"A ceramic teapot on a linen cloth, soft window light, muted palette","resolution":"2k","num_outputs":1,"aspect_ratio":"1:1","prompt_optimization_mode":"direct"}' \
--waitThe input is this endpoint’s own schema, same as the examples above. --wait polls until the task is finished and prints it; add --yes to skip the confirmation prompt in CI. Set SPICY_API_KEY first — one key works for the API, the CLI and the MCP server.
npx @spicyapi/cli tasks create --model alibaba/qwen-image-2.1-pro/text-to-image \
--input-json '{…}' --retention 1h --wait
npx @spicyapi/cli tasks get $TASK_ID # read back the retention that applied--retention only ever shortens the window — 30m, 1h, 7d, or 0 to delete as soon as the task reaches a terminal state. The value that actually applies is the shortest of your request, your account settings and the platform maximum, so read it back from the task record rather than assuming the number you asked for took effect. Passing a longer window than your account allows does nothing.
Install the SpicyAPI nodes from ComfyUI Manager or with the command below, then search for Qwen Image 2.1 Pro · Text to Image on the canvas. The node has the same options as this page and shows its price before it runs.
cd ComfyUI/custom_nodes
git clone https://github.com/spicyapi-ai/comfyui-spicyapiThe embedded panel reads the same schema as this page, so it cannot drift from the API. If your docs need the content to be searchable, read the JSON under /api/embed/models/ and render it yourself.
<iframe src="https://spicyapi.ai/embed/en/models/qwen-image-2-1-pro/api?model=alibaba%2Fqwen-image-2.1-pro%2Ftext-to-image" width="100%" height="560" loading="lazy" title="Request example" style="border:1px solid rgba(0,0,0,.12)"></iframe>