OpenAI

Invoke supports OpenAI’s image generation models — the GPT Image family and DALL·E 3 — through the OpenAI API.

DALL·E 2 removed

DALL·E 2 was deprecated by OpenAI and is scheduled for shutdown on 2026-05-12. It is no longer offered as a starter model in Invoke.

Getting an API Key

1. Open the OpenAI API Platform and sign in.
2. Create a new secret API key.
3. Make sure your account has billing set up — image endpoints are paid per request.

Configuration

Add your key to api_keys.yaml in your Invoke root directory:

external_openai_api_key: "sk-..."

# Optional — use this to point at a compatible proxy or Azure OpenAI deployment
external_openai_base_url: "https://api.openai.com"

Restart Invoke for the change to take effect.

Available Models

Model	Modes	Aspect Ratios	Batch	Notes
GPT Image 1.5	txt2img, img2img	1:1, 3:2, 2:3	up to 10	Fastest and cheapest GPT Image model.
GPT Image 1	txt2img, img2img	1:1, 3:2, 2:3	up to 10	Highest quality of the GPT Image family.
GPT Image 1 Mini	txt2img, img2img	1:1, 3:2, 2:3	up to 10	~80% cheaper than GPT Image 1.
DALL·E 3	txt2img only	1:1, 7:4, 4:7	1	No reference-image / edit support.

Inpainting (mask-based editing) is not currently supported for any OpenAI model in Invoke. img2img on the GPT Image family routes through the /v1/images/edits endpoint without a mask.

Provider-Specific Options

For GPT Image models, Invoke surfaces two provider-specific options in the parameters panel:

• Quality — low, medium, high, or auto. Higher quality costs more and takes longer.
• Background — auto, transparent, or opaque. Use transparent for PNG output with an alpha channel.

DALL·E 2 and DALL·E 3 do not expose these options.

How Requests Are Routed

• Pure text-to-image requests hit /v1/images/generations.
• Any request with an init image or reference images is sent to /v1/images/edits instead. This is done transparently — you don’t need to pick an endpoint.

Tips

1. Batching on GPT Image tops out at 10 per request. Larger batches are split into multiple API calls.
2. Costs can climb quickly with high-quality GPT Image generations. Start with GPT Image 1 Mini when iterating on prompts.
3. Rate limits from OpenAI surface as failed invocations — retry after a short wait.