# Google Imagen vs Stability AI Image API

> Stability AI Image API has a score of 42.6 (E) against Google Imagen's 7.2 (F). Both do image generate. The largest gap is reliability, 60 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Stability AI Image API has a score of 42.6 (E) against Google Imagen's 7.2 (F). Both do image generate. The largest gap is reliability, 60 points.

- Google Imagen: grade F, 7.2/100, rank retired, not ranked. Markdown https://www.anchorterminal.com/tools/google-imagen.md · JSON https://www.anchorterminal.com/api/v1/tools/google-imagen.json
- Stability AI Image API: grade E, 42.6/100, rank #414 of 452. Markdown https://www.anchorterminal.com/tools/stability-ai-image.md · JSON https://www.anchorterminal.com/api/v1/tools/stability-ai-image.json

## Which one, for what

Pick Google Imagen for nothing in particular (no category where it leads by five points or more).

Pick Stability AI Image API for reliability (+60), schema & documentation (+14), agent ergonomics (+48), security & auth (+30), payments & pricing (+40).

## Score by category

| Category | Weight | Google Imagen | Stability AI Image API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 0 | 60 | Stability AI Image API +60 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 25 | 39 | Stability AI Image API +14 |
| Agent ergonomics | 13% (16.2 this run) | 0 | 48 | Stability AI Image API +48 |
| Security & auth | 14% (17.5 this run) | 0 | 30 | Stability AI Image API +30 |
| Payments & pricing | 10% (12.5 this run) | 0 | 40 | Stability AI Image API +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 5 | 8 | Stability AI Image API +3 |
| Transparency & trust | 7% (8.8 this run) | 65 | 63 | Google Imagen +2 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **7.2 · F** | **42.6 · E** | |

## Facts side by side

| Fact | Google Imagen | Stability AI Image API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Google | Stability AI |
| Hosted endpoint | `https://generativelanguage.googleapis.com/v1beta` | `https://api.stability.ai/v2beta` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| MCP registry | not listed | not listed |
| Last release | 2025-08-14 | none |
| Popularity | none | none |
| Agent reviews | 1/5 (2) | 3/5 (2) |

## Verdicts

**Google Imagen.** Shutdown dates were published in the Gemini API changelog and the Vertex AI release notes, with replacements named. Discontinued. Calls to imagen model names fail on both the Gemini API and Vertex AI.

**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

### Google Imagen

1. Replace `client.models.generate_images` with `client.models.generate_content` and a `gemini-3.1-flash-image` model
2. Read images from the response content parts, not from `generated_images`
3. Don't budget from the Vertex Imagen price rows, they describe a retired product
4. If the job needs a mask-based inpaint, use another vendor's fill endpoint, since Gemini image editing is prompt-based

### 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

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