Report Bug / Feature RequestReport Bug / Feature Request
AI Image Editor AI Image Enhancer AI Image Upscaler Background Remover Object Remover Face Swap AI Headshot Generator AI Avatar Generator More →

AI Image - PixArt-Σ

Commercial use OK 583 models No watermark No sign-up needed
Model:
+ GPT-5, Claude, Gemini
Image model Self-hosted OpenRAIL++ 600M
PixArt-Σ — PixArt-Σ - OpenRAIL++. Transformer-based 4K-capable image gen at a fraction of SDXL's compute.
~1000 tokens/per image
0%
Starting generation...

What is PixArt-Σ?

PixArt-Σ - OpenRAIL++. Transformer-based 4K-capable image gen at a fraction of SDXL's compute.

Best for: Ultra-high-resolution generation on modest GPUs.

Why use PixArt-Σ for image generation?

Text-to-image

Type a description, get an image. Style, aspect ratio, and batch count are all controllable from the form above.

Aspect ratios

Square, landscape, portrait, 4:3, 3:4. Pick the ratio in the form so the model frames the shot for that shape.

Batch generate

Pick 1, 2, or 4 in the count field above. For larger fan-outs use /image/generate/ which sends one prompt to multiple models in parallel.

Commercial use OK

No watermark, outputs are yours. Commercial use is in scope across every model on Free.ai.

Sample prompts

Anime girl with cherry-blossom hair standing on a Tokyo rooftop at sunset
Studio Ghibli style village by a river, warm summer afternoon, hand-drawn
Manga panel of a swordsman blocking a strike, dynamic pose, bold ink lines
Cute chibi sticker pack: 6 expressions of a sleepy raccoon barista
Fantasy battle scene, two dragons fighting above clouds, painterly anime style
Slice-of-life cafe interior at golden hour, anime aesthetic, soft bokeh

Pricing

Self-hosted on our GPUs. Generation draws from your daily free pool first; once that runs out, paid token packs start at $1. Roughly ~1000 tokens per image.

Compare to alternatives

Google: Nano Banana 2.1 Premium

Google: Nano Banana 2.1 is an AI model by Google on Free.ai. It supports up to 65,536 tokens of context. Costs approxima...
Seedream 5 Pro Premium

Seedream 5 Pro is a image model by ByteDance, available on Free.ai. Each image costs approximately 75,938 tokens. Compar...
Google: Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) Premium

Google: Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) is an AI model by Google on Free.ai. It supports up to 65,536 t...

Full model reference → · See all image models → · Compare 2 image models side-by-side →

Advanced options
Result
Tokens running low. Get More Tokens
Want better results? Premium models (GPT-5, Claude, Gemini) deliver higher quality. View Plans

❤️ Love Free.ai? Tell your friends!

Sign up to get a referral link and earn 30,000 tokens per friend.

Want more? Sign up free: 30,000 tokens/day
Sign Up Free

Processing your request...

PixArt-Σ - OpenRAIL++. Transformer-based 4K-capable image gen at a fraction of SDXL's compute.

How to Use AI Image - PixArt-Σ

1
Enter your input

Type text, upload a file, or describe what you want. No account needed.

2
Click generate

Our AI processes your request in seconds using the best open-source models.

3
Download & share

Download, copy, or share your result. Free for personal and commercial use.

Use this tool via API

Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.

API Documentation Get API Key 
curl -X POST https://api.free.ai/v1/image/generate/ \
  -H "Authorization: Bearer sk-free-..." \
  -H "Content-Type: application/json" \
  -d '{"prompt": "A sunset over mountains", "model": "sdxl"}'

Related Free AI Tools

AI Image Editor
AI Image Enhancer
AI Image Upscaler
Background Remover
Object Remover
Face Swap
AI Headshot Generator
AI Avatar Generator

AI Image - PixArt-Σ - FAQ

PixArt-Σ - OpenRAIL++. Transformer-based 4K-capable image gen at a fraction of SDXL's compute.

PixArt-Σ works well for Ultra-high-resolution generation on modest GPUs.. Try the sample prompts above to see its strengths.

About 1,000 tokens per image, shown live before you generate. A free Free.ai account includes a 30,000-token daily pool, so most users can try PixArt-Σ without spending anything; beyond it, token top-ups start at $1.

It depends on the prompt. Free.ai lets you compare PixArt-Σ side-by-side with any other model at /image/compare/ - pick a sibling from the alternatives list to see how they differ on the same input.

Yes. Free.ai does not add watermarks and the outputs are yours to use commercially. The underlying model is OpenRAIL++-licensed. See /models/pixart-sigma/ for the full breakdown.

On Free.ai, PixArt-Σ supports 1:1 (square), 16:9 (landscape), 9:16 (portrait), 4:3, and 3:4. Pick the ratio in the form above before generating.

Most images come back in 5-25 seconds depending on the model and current GPU load. The result appears inline; signed-in users can also Add to queue to close the tab and get notified when it lands.

Yes - pick 1, 2, or 4 in the count field. Each image deducts about 1,000 tokens. For larger batches use /image/generate/ which fans out the same prompt across multiple models in parallel.

Free.ai does not train models on your prompts. Self-hosted models stay on our GPUs. Premium models route to the upstream provider for inference. Either way we never resell your data.

Yes. POST to /v1/image/generate/ with model="pixart-sigma" and include your Bearer token. Full reference: /api/.

PixArt-Σ is OpenRAIL++-licensed with 600M parameters - see /models/pixart-sigma/ for the model card and our open-source repos at github.com/freeaigit for ready-to-run scripts.

Free accounts get a 30,000-token daily pool. When that runs out, token top-ups start at $1, pay-as-you-go - no subscription required.

Sign up free: 30,000 tokens/day

Create Free Account

No credit card required

How would you rate this tool?

Love Free.ai? Tell your friends!