GPT Image 2.5 vs Seedream 5.0 Pro
A near tie on quality, so price decides. Over 10 posters and 8 product shots, both got every Chinese character right and neither changed a product. Our blind panel slightly preferred GPT Image 2.5 on posters and Seedream 5.0 Pro on product shots with people, but neither margin is beyond what four graders' taste can explain. On Higgsfield, GPT Image 2.5 costs 0.5 credits an image against 1.25. If you pay API list prices instead, Seedream is the cheaper one.
Round 1, head to head
The same 18 briefs for both, one attempt each, run on Higgsfield on 31 Oct 2026. Four graders scored every output without seeing model names; a brief counts as won when the panel's adjusted average is clearly higher. Full results: posters with Chinese text and product photos.
| GPT Image 2.5 | Seedream 5.0 Pro | |
|---|---|---|
| Chinese characters right, 10 posters | 58 / 58 | 58 / 58 |
| Products kept intact, 8 shots | 8 / 8, no changes | 8 / 8, no changes |
| Posters: briefs won with the blind panel (6 of 10 tied) | 3 | 1 |
| Product shots: briefs won with the blind panel (4 of 8 tied) | 1 | 3 |
| BiBi Score, posters with Chinese text | 87 | 77 |
| BiBi Score, product photos | 80 | 72 |
| Higgsfield credits per image (1K) | 0.5 | 1.25 |
Where the panel agreed most
Snack bag held up by a woman in a store: all four graders preferred GPT Image 2.5. Phone held up by a man in a park: three of four preferred Seedream 5.0 Pro.
First look, 29 Oct
Three prompts we ran before round 1. GPT Image 2.5 added text we didn't ask for on two of them. On round 1's 10 posters, which asked for no other text, it added none.
Realistic portrait
Prompt 1 · 4:3Photorealistic portrait of a young woman barista in a sunlit cafe, steam rising from a latte she is holding, shallow depth of field, 35mm film look, natural skin texture, warm morning light
Poster with Chinese headline
Prompt 2 · 3:4Minimalist autumn coffee promotion poster. Large Chinese headline text: 秋日第一杯. Smaller English line below: First Cup of Autumn. A single ceramic cup with a maple leaf, warm orange and cream palette
Product photo, unbranded
Prompt 3 · 1:1Studio product photo of an unbranded amber glass bottle of herbal shampoo on a pale stone pedestal, soft daylight from the left, fresh eucalyptus leaves, clean e-commerce composition
Specs and prices
| GPT Image 2.5 | Seedream 5.0 Pro | |
|---|---|---|
| Maker · released | OpenAI · 8 Sep 2026 | ByteDance · 12 Aug 2026 |
| Max output | up to 3840 × 2160 | 2K native, 4K by upscaling |
| API list price per image | ≈ $0.21 at max quality | from $0.045 |
| Cost on Higgsfield (1K) | 0.5 credits (medium) | 1.25 credits |
| Artificial Analysis, text to image | #1 (Sunburst variant) | not in top 5 |
| Mainland China access | not verified | yes (Jianying) |
| BiBi Score | 87 posters · 80 product photos | 77 posters · 72 product photos |
Sources: OpenAI/APIYI launch notes (Sep 2026), OpenRouter (Seedream 5.0 Pro), Artificial Analysis text to image arena (29 Oct 2026), Higgsfield cost preview (29 Oct 2026).