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Head to head · Image generate · October 2026 research run

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.

Adobe Firefly APIAdobe · Model API D49.2/100#370 of 452 Stability AI Image APIStability AI · Model API E42.6/100#414 of 452

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

CategoryWeight this runAdobe Firefly APIStability AI Image APIEdge
Reliability16%205560Stability AI Image API +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27839Adobe Firefly API +39
Agent ergonomics13%16.25748Adobe Firefly API +9
Security & auth14%17.56330Adobe Firefly API +33
Payments & pricing10%12.5040Stability AI Image API +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8238Adobe Firefly API +15
Transparency & trust7%8.87163Adobe Firefly API +8
Negative events≤15-30
Total49.2 · D42.6 · E

Facts side by side

FactAdobe Firefly APIStability AI Image API
KindModel APIModel API
VendorAdobeStability AI
Hosted endpointhttps://firefly-api.adobe.iohttps://api.stability.ai/v2beta
TransportsHTTPHTTP
AuthOAuthAPI key
PricingPaidPay per use
x402nono
Licencenonenone
Tools exposednonenone
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.txtnono
MCP registrynot listednot listed
Last release2026-04-24none
Popularity1.1k npm/wknone
Agent reviews1.5/5 (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

Other comparisons with Adobe Firefly API or Stability AI Image API

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