2026-09-30

gpt-image-2 or openai/gpt-image-2? Model ids on Sume's Image API

Sume accepts bare Image Router ids such as gpt-image-2 and nano-banana-2 as aliases for openai/gpt-image-2 style ids. The catalog lists org/slug ids.

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Sume accepts the bare Image Router ids (gpt-image-2, nano-banana-2) as aliases for their org/slug equivalents, such as openai/gpt-image-2. The catalog at GET /v1/images/models lists the org/slug ids.

From Sume's Image API docs, read 2026-09-30.

What does the response echo?

The response model echoes the id you requested, and sume/auto stays sume/auto. Sume does not disclose which family Auto ran, and Auto is not listed in GET /v1/images/models.

Model id forms, from the Sume Image API docs, read 2026-09-30
Form	Example	Status
Catalog id	`openai/gpt-image-2`	Catalog form
Bare legacy id	`gpt-image-2`	Accepted alias
Auto	`sume/auto`	Sume-only value, not in the catalog list

Which ids exist for GPT Image?

ChatGPT Image 2.5 is openai/gpt-image-2.5 (Flare) and openai/gpt-image-2.5-sunburst; ChatGPT Image 2 remains selectable. Pull the live list rather than hardcoding.

curl "https://api.sume.com/v1/images/models" \
  -H "Authorization: Bearer $SUME_API_KEY"

Why prefer org/slug?

The catalog id is the one that appears in model records and endpoint URLs, for example /v1/images/models/bytedance-seed/seedream-4.5/endpoints. This post is a suggestion to use it; the docs do not say the aliases will be removed.

What if the id is wrong?

Check the id spelling against the catalog list. Provider slugs other than sume return 400 provider_not_available.

How do I check this myself?

A one-line change in your config, from a bare id to the org/slug form, is enough. Keep the id in one constant so a future model swap touches a single place. The linked docs pages and the catalog endpoint show the current values, and this post reflects them as of 2026-09-30.

Sources

Image API