> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# New FAQ: output format and background compatibility for GPT Image 2.6 official relay

> New GPT Image 2.6 official-relay FAQ for gpt-image-2.6-sunburst / gpt-image-2.6-flare: transparent + jpeg is the only hard 400, gif supports 1-bit transparency, and svg needs opaque for a background.

**2026/11/12 13:45 (UTC+8)** · Docs Update · OpenAI

📖 **New FAQ: GPT Image 2.6 official relay — output format and background compatibility**

For `gpt-image-2.6-sunburst` / `gpt-image-2.6-flare`: `background: "transparent"` with `output_format: "jpeg"` is the only combination that returns 400. `png` / `webp` give full alpha, `gif` on 2.6 gives 1-bit transparency, and `svg` only writes a full-canvas white background with `opaque`. The page includes the measured 5 × 3 matrix.

Another easy mistake is `auto`: it is not fixed to `opaque` and follows the prompt; pass `transparent` or `opaque` explicitly for deterministic output.

📖 [Read the output format and background FAQ](https://docs.apiyi.com/en/faq/gpt-image-output-format-background.md)

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