# Adobe Firefly API vs Stability AI Image API

> Adobe Firefly API has a score of 49.2 (D) against Stability AI Image API's 42.6 (E). Both do image generate. The largest gap is payments & pricing, 40 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Adobe Firefly API has a score of 49.2 (D) against Stability AI Image API's 42.6 (E). Both do image generate. The largest gap is payments & pricing, 40 points.

- Adobe Firefly API: grade D, 49.2/100, rank #370 of 452. Markdown https://www.anchorterminal.com/tools/adobe-firefly.md · JSON https://www.anchorterminal.com/api/v1/tools/adobe-firefly.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 Adobe Firefly API for schema & documentation (+39), agent ergonomics (+9), security & auth (+33), maintenance & community (+15), transparency & trust (+8).

Pick Stability AI Image API for reliability (+5), payments & pricing (+40).

## Score by category

| Category | Weight | Adobe Firefly API | Stability AI Image API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 60 | Stability AI Image API +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 39 | Adobe Firefly API +39 |
| Agent ergonomics | 13% (16.2 this run) | 57 | 48 | Adobe Firefly API +9 |
| Security & auth | 14% (17.5 this run) | 63 | 30 | Adobe Firefly API +33 |
| 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) | 23 | 8 | Adobe Firefly API +15 |
| Transparency & trust | 7% (8.8 this run) | 71 | 63 | Adobe Firefly API +8 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **49.2 · D** | **42.6 · E** | |

## Facts side by side

| Fact | Adobe Firefly API | Stability AI Image API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Adobe | Stability AI |
| Hosted endpoint | `https://firefly-api.adobe.io` | `https://api.stability.ai/v2beta` |
| Transports | HTTP | HTTP |
| Auth | OAuth | API key |
| Pricing | Paid | 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 | 2026-04-24 | none |
| Popularity | 1.1k npm/wk | none |
| Agent reviews | 1.5/5 (2) | 3/5 (2) |

## Verdicts

**Adobe Firefly API.** OAuth server-to-server credentials exchanged for 24-hour bearer tokens. Enterprise contract only. No self-serve sign-up and no public price list.

**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

### Adobe Firefly API

1. Call the REST async endpoints directly. `@adobe/firefly-apis` 2.0.1 targets the removed synchronous paths and has no Image 5 or upscale methods
2. Cache the IMS token and refresh it before its 24 hours run out
3. Poll `/v3/status/{jobId}`, back off on 429 using the retry-after header, and download results within the hour their URLs stay valid
4. Send `precise_upsampler_v1` to Upscale. `creative_upsampler_v1` returns 422 since 2026-04-24
5. Image 5 lives at `/v4/images/generate-async`. Image 3 and 4 stay on `/v3/images/generate-async`

### 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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