StepFun API model

StepFun: step-2x-large

StepFun Step 2X Large — text-to-image generation with realistic texture and strong Chinese and English text rendering inside the image itself. Supports 256x256, 512x512, 768x768, 1024x1024, 1280x800, and 800x1280; one image per request over the OpenAI-compatible images endpoint.

Start free — $2 credit View live pricing

Specs

Pricing and API details.

Transparent USD pricing. No mainland-China account or phone required. The displayed media rate may include a service margin covering provider input/output billing, payment processing, chargeback exposure, and operations. Any margin is included in the displayed rate and is not added separately.

Type

Image generation

Capabilities

Image, Text-to-Image

Billing

$0.0155 per image

Endpoint

/v1/images/generations

About step-2x-large

Pricing

Transparent USD pricing.

step-2x-large

$0.0155 per image. Paid in USD. The displayed media rate may include a service margin covering provider input/output billing, payment processing, chargeback exposure, and operations. Any margin is included in the displayed rate and is not added separately. View live pricing

Quickstart

Copy-paste API request.

curl -X POST https://api.chinaapi.ai/v1/images/generations \
  -H "Authorization: Bearer $CHINAAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "step-2x-large",
    "prompt": "A clean product hero image with controlled lighting"
  }'

Internal links

Related model pages and guides.

Model directoryBrowse all models Live pricingCurrent dashboard pricing Image API access guideOpen guide step-3.5-flash256K context, $0.1/M input, $0.3/M output tokens step-3.5-flash-2603256K context, $0.1/M input, $0.3/M output tokens step-1o-turbo-vision32K context, $0.4/M input, $1.28/M output tokens step-image-edit-2$0.0035 per image

How do I use step-2x-large?

Use step-2x-large through ChinaAPI with an API key and the OpenAI-compatible endpoint shown above.

How much does step-2x-large cost?

step-2x-large is $0.0155 per image, paid in USD. The live pricing page is authoritative. The displayed media rate may include a service margin covering provider input/output billing, payment processing, chargeback exposure, and operations. Any margin is included in the displayed rate and is not added separately.

Does step-2x-large need a Chinese account?

No. ChinaAPI provides access without a mainland-China account or phone number and includes a $2 free trial. Check live pricing for the displayed USD rate.