Choose an image-editing API by edit fidelity, not generation quality alone. Test whether it changes only the requested region, preserves identity and composition, handles text, and supports your required input/output formats. Include rejected edits in the cost calculation.
A practical evaluation method
- Build a fixed set of local edits, background changes, text edits, and multi-reference tasks.
- Blind-score preservation and requested-change accuracy separately.
- Record image limits, masks, aspect ratios, latency, and accepted-edit cost.
Editing Is a Different Skill Than Generation
Plenty of models generate a pretty image; far fewer let you change one thing in it without wrecking the rest. Instruction-based editing — "swap the label, keep everything else" — plus layer separation and reliable text edits are what separate a real editing API from a generator. Here are the best in 2026, all on LinkModel under one key.
The Top Editing Models
Seedream 5.0 Pro — deepest editing toolkit
ByteDance's Seedream 5.0 Pro is purpose-built for editing: point/box/lasso region selection, color and material replacement, sketch completion, separable layers, and up to 10 reference images for multi-image fusion — all while keeping lighting, texture, and composition intact. Cheapest of the three (~$0.0675–0.135/image) and strong on 14-language text. Best for iterative commercial design where you tweak, not regenerate. See the API guide.
GPT Image 2 — best for text-in-image edits
GPT Image 2 does high-fidelity, instruction-based editing with near-strong text rendering for many prompts — ideal for fixing or changing copy inside an image. Caveat: reference/edit inputs bill at a fixed high rate you can't disable, so batch related edits. Prompting guide.
Nano Banana Pro — best for localized + grounded edits
Nano Banana Pro offers localized edits, lighting/focus adjustments, and camera transforms, plus Search grounding for factual changes — fast (2–12s), with a mandatory SynthID watermark. Its cheaper sibling Nano Banana 2 handles high-volume interactive editing.
Quick Picks
| Need | Best |
|---|---|
| Layer separation / compositing | Seedream 5.0 Pro |
| Change/fix text inside an image | GPT Image 2 |
| Localized, grounded, fast edits | Nano Banana Pro |
| High-volume interactive editing | Nano Banana 2 |
| Lowest cost per edit | Seedream 5.0 Pro |
The Edit-Cost Trap
Editing bills differently than generation. GPT Image 2 charges reference inputs at high fidelity; Nano Banana watermarks every output; Seedream charges per extra reference image (~$0.0045). For iterative work, model 2–3x the naive per-image cost and batch related edits. Cost tactics in how to reduce AI API costs.
One Request Shape for All
curl -X POST https://api.linkmodel.ai/api/v1/image-generation \
-H "Authorization: Bearer $LINKMODEL_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "seedream-5.0-pro", "prompt": "Replace the background with a white studio, keep the product and its label unchanged", "image_url": "https://your-cdn.com/product.jpg" }'Swap the model string to A/B editors on the same source image. Full generation field in best AI image generation APIs; the premium head-to-head in Seedream vs Nano Banana Pro.
Bottom Line
For a full editing toolkit at the lowest cost, Seedream 5.0 Pro; for text-in-image fixes, GPT Image 2; for fast, grounded, localized edits, Nano Banana Pro.
Start free with a $1 credit and edit your own image through one API.
