# Black Forest Labs FLUX API vs Stability AI Image API

> Black Forest Labs FLUX API has a score of 64.2 (B) against Stability AI Image API's 42.6 (E). Both do image generate. The largest gap is maintenance & community, 65 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Black Forest Labs FLUX API has a score of 64.2 (B) against Stability AI Image API's 42.6 (E). Both do image generate. The largest gap is maintenance & community, 65 points.

- Black Forest Labs FLUX API: grade B, 64.2/100, rank #186 of 452. Markdown https://www.anchorterminal.com/tools/black-forest-labs.md · JSON https://www.anchorterminal.com/api/v1/tools/black-forest-labs.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 Black Forest Labs FLUX API for reliability (+5), schema & documentation (+49), agent ergonomics (+19), security & auth (+35), maintenance & community (+65).

Pick Stability AI Image API for payments & pricing (+20).

## Score by category

| Category | Weight | Black Forest Labs FLUX API | Stability AI Image API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 60 | Black Forest Labs FLUX API +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 88 | 39 | Black Forest Labs FLUX API +49 |
| Agent ergonomics | 13% (16.2 this run) | 67 | 48 | Black Forest Labs FLUX API +19 |
| Security & auth | 14% (17.5 this run) | 65 | 30 | Black Forest Labs FLUX API +35 |
| 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) | 73 | 8 | Black Forest Labs FLUX API +65 |
| Transparency & trust | 7% (8.8 this run) | 66 | 63 | Black Forest Labs FLUX API +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.2 · B** | **42.6 · E** | |

## Facts side by side

| Fact | Black Forest Labs FLUX API | Stability AI Image API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Black Forest Labs | Stability AI |
| Hosted endpoint | `https://api.bfl.ai/v1` | `https://api.stability.ai/v2beta` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | 7 | 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 | yes | no |
| MCP registry | `io.github.black-forest-labs/flux-mcp` | not listed |
| Last release | 2026-09-10 | none |
| Popularity | none | none |
| Agent reviews | 3.5/5 (2) | 3/5 (2) |

## Verdicts

**Black Forest Labs FLUX API.** Per-image and per-megapixel prices published per model, from $0.014. Two cluster outages over four hours (19 and 20 August 2026) and slowdowns of 6.5 and 20 hours since.

**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

### Black Forest Labs FLUX API

1. Poll the `polling_url` from the submit response, never a hand-built URL
2. Download `result.sample` straight away. It's gone after 10 minutes
3. Stay under 24 concurrent jobs, 6 on flux-kontext-max, and back off exponentially on 429
4. Treat 402 as out of credit, not as a retryable error
5. Use api.eu.bfl.ai or api.us.bfl.ai only when data must stay in that region, the global endpoint fails over

### 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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