AI Image Generation & Editing
GPT Image (OpenAI) vs Stability AI (Stable Diffusion)
Which is better depends on the job. Here's how they compare on facts and — where we've run them — our standardized tests.
OpenAI's image generation and editing in ChatGPT and via API.
Developer of Stable Diffusion image models and related APIs.
Which should you choose?
NOT YET TESTED We won't name a winner until both tools have completed the same test tasks. Until then, use the verified facts below.
Scores by job
| Job | GPT Image (OpenAI) | Stability AI (Stable Diffusion) |
|---|---|---|
| Photoreal product & lifestyle shots | NOT YET TESTED | NOT YET TESTED |
| Posters, ads & images with correct text | NOT YET TESTED | NOT YET TESTED |
| Consistent character / brand style across images | NOT YET TESTED | NOT YET TESTED |
| AI photo editing (inpaint, remove, extend) | NOT YET TESTED | NOT YET TESTED |
| Vector graphics, icons & logo exploration | NOT YET TESTED | NOT YET TESTED |
Facts side by side
From official pages; "Not yet verified" means we haven't confirmed it yet.
| GPT Image (OpenAI) | Stability AI (Stable Diffusion) | |
|---|---|---|
| Company | OpenAI | Stability AI |
| Starting price | API from $30/1M output tokens | Free plan · paid price not yet verified |
| Free plan | Not yet verified | Yes |
| Free trial | Not yet verified | Not yet verified |
| API | Yes | Yes |
| Commercial use | Allowed on all plans | Restricted |
| Last tested | Never | Never |
| Facts updated | Oct 8, 2026 | Oct 8, 2026 |
GPT Image (OpenAI) vs Stability AI (Stable Diffusion): same prompt, raw outputs
Same input for every tool. We publish the first output (no cherry-picking), with the date, plan and model version used, plus a SHA-256 hash of the file.
When the test round runs, each task appears here as a row with one column per tool.
Head-to-head measurements
Objective metrics recorded by our test harness (same inputs for every tool). Raw outputs are archived as evidence.
Blind quality comparison
Subjective assessment by our evaluators, blind where possible. This is opinion, labelled as such — not a measured fact.
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New results, re-tests and major tool releases are posted on our updates page and in the RSS feed. We don’t collect email addresses.