Comparison
GPT Image 2 vs Stable Diffusion 3.5: Which Is Better? (2026)
Stable Diffusion 3.5 is also known as SD 3.5 Large. By Stability AI.
TL;DR Verdict
Stable Diffusion 3.5 is the most customizable option for power users with GPU access, but GPT Image 2 delivers far better out-of-box quality, text rendering, and does not require any hardware investment.
Feature Comparison
| Feature | GPT Image 2 | Stable Diffusion 3.5 |
|---|---|---|
| Text Rendering | Excellent | Limited |
| Max Resolution | 4K | 2K |
| Speed | Fast (4-6s) | Medium |
| Character Consistency | Excellent | Limited |
| Transparent PNG | Yes | No |
| Inpainting | Yes | Yes |
| API Available | Yes | Yes |
Stable Diffusion 3.5 — Strengths & Weaknesses
Strengths
- Fully open weights with permissive licensing for commercial and research use
- Massive ecosystem of fine-tunes, LoRAs, ControlNets, and community tools
- Runs efficiently on consumer GPUs (8GB+ VRAM for SD 3.5 Medium)
- Highly customizable pipeline supports advanced workflows with ComfyUI and A1111
Weaknesses
- Base model quality noticeably below Flux, Midjourney, and GPT Image 2 without fine-tuning
- Text rendering is poor even with the improved MMDiT architecture
- Stability AI's uncertain financial situation raises long-term support concerns
Pricing Comparison
GPT Image 2
Free on our platform (8/day). API pricing expected: $0.02-0.12/image depending on quality and resolution.
Stable Diffusion 3.5
Free (self-hosted); API via Stability AI from $0.03/image
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