gemini-3.1-flash-lite-image vs wan2.7-image-pro
Which one, when — curated verdict, not a benchmark table
These two bill in different units — gemini-3.1-flash-lite-image charges per token ($0.25 per million in, $30 per million out) while wan2.7-image-pro charges $0.075 per call — so no single conversion is honest and you should compare on your own average request shape. Pick gemini-3.1-flash-lite-image when you want text back alongside images from text or image input, with a 4096-token output ceiling and a 2025-01 knowledge cutoff. Pick wan2.7-image-pro for pure image-out generation where flat per-call pricing makes costs predictable regardless of prompt length.
Pricing
| gemini-3.1-flash-lite-image | wan2.7-image-pro | Δ | |
|---|---|---|---|
| Per generated image | — | $0.075 | — |
| Input / 1M tokens | $0.25 | — | — |
| Output / 1M tokens | $30 | — | — |
These two models bill in different units, so no Δ is shown — converting between them would require an assumption we have not measured. Each card is listed in its own unit above.
Specs
| gemini-3.1-flash-lite-image | wan2.7-image-pro | |
|---|---|---|
| Input modalities | text image | text image |
| Output modalities | text image | image |
| Released | 2026-06-30 | 2026-04-01 |
| Knowledge cutoff | 2025-01 | — |
| Output sizes | 1K only (1:1 = 1024x1024) |
|
| Input modes | text-to-image, interleaved generation + editing, up to 14 reference images | text-to-image, image editing (incl. bounding-box interactive edit), 0–9 reference images, text/image-to-image-set |
| Images per request | — | 12 |
| Formats | — | png |
| Notes | 1K (1024px) output only 10 aspect ratios (1:1, 3:2, 2:3, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9) and up to 14 reference images interleaved generation and editing with fast multi-turn local edits sub-2s end-to-end latency SynthID + C2PA watermarking always on | 4K text-to-image (max 4096x4096; editing max 2K), aspect ratios 1:8-8:1 instruction + click-to-edit editing character-consistent sets up to 12 images print-quality text rendering incl. formulas/tables |
Specs are transcribed from each vendor’s documentation; a row a vendor does not publish is left out rather than inferred. Full sources: gemini-3.1-flash-lite-image · wan2.7-image-pro
One prompt, both models — measured through the gateway
One prompt, one request per model, no retries and no cherry-picking — the first result each model returned. Neither size nor duration was pinned: each model used its own default, because a request shaped to fit all of them would flatter none. Files here are re-encoded for the web, so judge composition and prompt adherence, not compression.
Switch between them with one line
Both ids are in every tab below — the highlighted pair of lines is the only edit. Same endpoint, same key, same request shape.
from openai import OpenAI
client = OpenAI(
base_url="https://synthorai.io/v1",
api_key="sk-syn-...",
)
resp = client.images.generate(
model="gemini-3.1-flash-lite-image",
# model="wan2.7-image-pro", # uncomment this line, comment the one above
prompt="a watercolor lighthouse at dawn",
size="1024x1024",
)
print(resp.data[0].b64_json[:80])import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://synthorai.io/v1",
apiKey: "sk-syn-...",
});
const resp = await client.images.generate({
model: "gemini-3.1-flash-lite-image",
// model: "wan2.7-image-pro", // uncomment this line, comment the one above
prompt: "a watercolor lighthouse at dawn",
size: "1024x1024",
});
console.log(resp.data?.[0]?.b64_json?.slice(0, 80));curl https://synthorai.io/v1/images/generations \
-H "Authorization: Bearer sk-syn-..." \
-H "Content-Type: application/json" \
-d '{
"model": "gemini-3.1-flash-lite-image",
# "model": "wan2.7-image-pro", # uncomment this line, comment the one above
"prompt": "a watercolor lighthouse at dawn",
"size": "1024x1024"
}'package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/option"
)
func main() {
client := openai.NewClient(
option.WithBaseURL("https://synthorai.io/v1"),
option.WithAPIKey("sk-syn-..."),
)
resp, _ := client.Images.Generate(context.TODO(), openai.ImageGenerateParams{
Model: "gemini-3.1-flash-lite-image",
// Model: "wan2.7-image-pro", // uncomment this line, comment the one above
Prompt: "a watercolor lighthouse at dawn",
Size: "1024x1024",
})
fmt.Println(resp.Data[0].B64JSON[:80])
}import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.images.*;
OpenAIClient client = OpenAIOkHttpClient.builder()
.baseUrl("https://synthorai.io/v1")
.apiKey("sk-syn-...")
.build();
ImagesResponse resp = client.images().generate(
ImageGenerateParams.builder()
.model("gemini-3.1-flash-lite-image")
// .model("wan2.7-image-pro") // uncomment this line, comment the one above
.prompt("a watercolor lighthouse at dawn")
.size("1024x1024")
.build());
System.out.println(resp.data().orElseThrow().get(0).b64Json().orElseThrow().substring(0, 80));FAQ
Which is cheaper, gemini-3.1-flash-lite-image or wan2.7-image-pro?
They bill in different units, so there is no single honest number: gemini-3.1-flash-lite-image and wan2.7-image-pro each appear in their own unit in the table above. Compare them on your own workload — the practical trade-off is described in the verdict at the top of this page.
Can I A/B test gemini-3.1-flash-lite-image against wan2.7-image-pro without two integrations?
Yes. Both are served through the same OpenAI-compatible endpoint with one API key — switching is a one-line model-string change, so you can route a fraction of traffic to each and compare bills directly.
Does the price change with image size?
It depends on how the model bills. Per-image models charge the same regardless of prompt or output size; token-billed models scale with the resolution you render, so a 4K image costs a multiple of a small one. The table above shows which applies to each.