# Qwen-Image 2.1 (Model Studio) vs Stability AI Image API

> Qwen-Image 2.1 scores 64.7 (B) to Stability AI Image's 42.3 (E) for image generation. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/qwen-image-2-1-vs-stability-ai-image
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-10

Qwen-Image 2.1 (Model Studio) scores 64.7 (B) on agent readiness against Stability AI Image API's 42.3 (E), and leads in 6 of 7 scored categories. Stability AI Image API leads on payments & pricing. Both do image generation.

- Qwen-Image 2.1 (Model Studio): grade B, 64.7/100, rank #347 of 961. Markdown https://www.anchorterminal.com/tools/qwen-image-2-1.md · JSON https://www.anchorterminal.com/api/v1/tools/qwen-image-2-1.json
- Stability AI Image API: grade E, 42.3/100, rank #904 of 961. Markdown https://www.anchorterminal.com/tools/stability-ai-image.md · JSON https://www.anchorterminal.com/api/v1/tools/stability-ai-image.json
- Best image generation for AI agents: https://www.anchorterminal.com/best/image-generation/index.md
- All 78 image comparisons: https://www.anchorterminal.com/compare/image-generation/index.md

## Which one, for what

### Qwen-Image 2.1 (Model Studio) (B)

Good for: Low-cost image generation and multi-reference editing with transparent PNG output, for agents already on Model Studio or using the OpenAI Images protocol.

Ahead on:
- Reliability, 70 against 60
- Schema & documentation, 66 against 39
- Agent ergonomics, 73 against 48
- Security & auth, 75 against 30
- Maintenance & community, 77 against 8
- Transparency & trust, 66 against 59

Watch for: 20 requests a minute in every region

### Stability AI Image API (E)

Good for: Cheap, fixed-price editing operations for agents that need inpaint, outpaint or upscale as separate calls.

Ahead on:
- Payments & pricing, 40 against 20

Watch for: No new image model we could date since SD 3.5 Flash in July 2025


## Score by category

| Category | Weight | Qwen-Image 2.1 (Model Studio) | Stability AI Image API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 60 | Qwen-Image 2.1 (Model Studio) +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 66 | 39 | Qwen-Image 2.1 (Model Studio) +27 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 48 | Qwen-Image 2.1 (Model Studio) +25 |
| Security & auth | 14% (17.5 this run) | 75 | 30 | Qwen-Image 2.1 (Model Studio) +45 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Stability AI Image API +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 77 | 8 | Qwen-Image 2.1 (Model Studio) +69 |
| Transparency & trust | 7% (8.8 this run) | 66 | 59 | Qwen-Image 2.1 (Model Studio) +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.7 · B** | **42.3 · E** | |

## Facts side by side

| Fact | Qwen-Image 2.1 (Model Studio) | Stability AI Image API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Alibaba Cloud | Stability AI |
| Hosted endpoint | `https://dashscope-intl.aliyuncs.com/api/v1` | `https://api.stability.ai/v2beta` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Closed API under Alibaba Cloud's product terms. Qwen-Image-2.1 weights are on Hugging Face under the Qwen Research License, for non-commercial use only. | none |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-02 | none |
| Terms last updated | couldn't be read | 2026-09-30 |
| Privacy policy last updated |  | 2026-09-30 |
| Customer content may train models | couldn't be read | yes, with an opt-out |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | yes |
| Terms or service can change without notice | couldn't be read | yes |
| Arbitration or class-action waiver | couldn't be read | yes |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**Qwen-Image 2.1 (Model Studio).** qwen-image-2.1-pro generates and edits images with up to 10 references and transparent output, at $0.04 an image in Singapore, through an OpenAI-compatible endpoint or DashScope. Model Studio publishes a 99.9 per cent SLA and a no-training statement. The model allows 20 requests a minute, has no OpenAPI file, and its open weights are for non-commercial use only.

**Stability AI Image API.** Fixed price per call for every endpoint, published in credits. No new image model we could date since SD 3.5 Flash in July 2025.

## Before you call either

### Qwen-Image 2.1 (Model Studio)

1. Use the same region for the key, the model and the endpoint. Cross-region calls fail
2. Download each result within 24 hours. The URL expires and the image is purged
3. With the OpenAI SDK, pass `image`, `seed`, `prompt_extend` and `watermark` through `extra_body`, and write size as `1024x1024`, not `1024*1024`
4. Set a client timeout of up to 600 seconds for several outputs, or use the async DashScope call and poll the task id
5. Do not send `prompt_extend_mode: agent` with input images. It returns 400

### Stability AI Image API

1. Send `accept: image/*` to get bytes back, or `application/json` for base64
2. Stay under 150 requests every 10 seconds. A 429 locks you out for 60 seconds
3. Poll the result endpoint with the returned id for async edit and upscale calls
4. Use Stable Image Core or SD 3.5 Flash for drafts, Ultra for finals
5. Send multipart form data, not JSON

## Questions

### Which is better for AI agents, Qwen-Image 2.1 (Model Studio) or Stability AI Image API?

Qwen-Image 2.1 (Model Studio) scores 64.7 (B) on agent readiness against Stability AI Image API's 42.3 (E), and leads in 6 of 7 scored categories. Stability AI Image API leads on payments & pricing.

### Do Qwen-Image 2.1 (Model Studio) and Stability AI Image API need an API key?

Both need an API key.

### Can an agent call Qwen-Image 2.1 (Model Studio) and Stability AI Image API without installing anything?

Yes. Qwen-Image 2.1 (Model Studio) has a hosted endpoint at https://dashscope-intl.aliyuncs.com/api/v1 and Stability AI Image API at https://api.stability.ai/v2beta.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/qwen-image-2-1-vs-stability-ai-image.json, and with the fewest tokens: https://www.anchorterminal.com/compare/qwen-image-2-1-vs-stability-ai-image.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "qwen-image-2-1", "b": "stability-ai-image"}`. From a terminal: `anchor compare qwen-image-2-1 stability-ai-image`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/qwen-image-2-1.json and https://www.anchorterminal.com/api/v1/tools/stability-ai-image.json

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