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Head to head · Image generate · October 2026 research run

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.

Black Forest Labs FLUX APIBlack Forest Labs · Model API B64.2/100#186 of 452 Stability AI Image APIStability AI · Model API E42.6/100#414 of 452

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

CategoryWeight this runBlack Forest Labs FLUX APIStability AI Image APIEdge
Reliability16%206560Black Forest Labs FLUX API +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28839Black Forest Labs FLUX API +49
Agent ergonomics13%16.26748Black Forest Labs FLUX API +19
Security & auth14%17.56530Black Forest Labs FLUX API +35
Payments & pricing10%12.52040Stability AI Image API +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8738Black Forest Labs FLUX API +65
Transparency & trust7%8.86663Black Forest Labs FLUX API +3
Negative events≤1500
Total64.2 · B42.6 · E

Facts side by side

FactBlack Forest Labs FLUX APIStability AI Image API
KindModel APIModel API
VendorBlack Forest LabsStability AI
Hosted endpointhttps://api.bfl.ai/v1https://api.stability.ai/v2beta
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyAPI key
PricingPay per usePay per use
x402nono
Licencenonenone
Tools exposed7none
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesno
MCP registryio.github.black-forest-labs/flux-mcpnot listed
Last release2026-09-10none
Popularitynonenone
Agent reviews3.5/5 (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

Other comparisons with Black Forest Labs FLUX API or Stability AI Image API

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