FreeModel exposes an OpenAI-compatible image generations endpoint. Select the exact model page under Image Series for its price and output rules.Live image models include Nano Banana 2.1 (nano-banana-2.1), GPT Image 2 (gpt-image-2) and GPT Image 2.5 Ext (gpt-image-2.5-ext and gpt-image-2.5-ext-sunburst). Confirm availability with GET /v1/models.
If the wait ends before the task finishes, the API returns HTTP 202 with a gateway task object. Send Prefer: respond-async to skip waiting. Then poll GET /v1/tasks/{id} with the same key. Optional Idempotency-Key (1–200 characters) applies to that gateway submission, not to an upstream provider response.See GPT Image 2.5 Ext for sizes, references, and per-image prices.
Ext bills per delivered image: $0.0085 at 1K, $0.014 at 2K, and $0.021 at
4K, for both Flare and Sunburst. This is not token billing. Catalog rates do
not include payment-processor fees or promotions.
gpt-image-2 takes quality (low, medium, or high) and a pixel size
(1024x1024, 1536x1024, or 1024x1536), with n fixed at 1. Like Ext, a
normal request waits for the image and returns data[].url, or HTTP 202
with a gateway task when the wait ends first; send Prefer: respond-async to
skip waiting.
curl https://api.freemodel.app/v1/images/generations \ -H "Authorization: Bearer $FREEMODEL_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "gpt-image-2", "prompt": "A small green ceramic bowl on a white studio background", "quality": "medium", "size": "1024x1024" }'
See GPT Image 2 for prices. gpt-image-2-all is not currently offered.
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