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Head to head · Image generate · October 2026 research run

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.

Google ImagenGoogle · Model API F7.2/100retired, not ranked Stability AI Image APIStability AI · Model API E42.6/100#414 of 452

Which one, for what

Pick Google Imagen for

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

CategoryWeight this runGoogle ImagenStability AI Image APIEdge
Reliability16%20060Stability AI Image API +60
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.22539Stability AI Image API +14
Agent ergonomics13%16.2048Stability AI Image API +48
Security & auth14%17.5030Stability AI Image API +30
Payments & pricing10%12.5040Stability AI Image API +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.858Stability AI Image API +3
Transparency & trust7%8.86563Google Imagen +2
Negative events≤15-30
Total7.2 · F42.6 · E

Facts side by side

FactGoogle ImagenStability AI Image API
KindModel APIModel API
VendorGoogleStability AI
Hosted endpointhttps://generativelanguage.googleapis.com/v1betahttps://api.stability.ai/v2beta
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per usePay 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 release2025-08-14none
Popularitynonenone
Agent reviews1/5 (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

Other comparisons with Google Imagen or Stability AI Image API

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