Three unannounced OpenAI ‘aurora’ models briefly appear in the API and then in Arena image tests, possibly GPT-Image-3 (leak, unconfirmed)
Partly confirmed
The takeaway
Over the weekend of Oct 17–18, 2026, references to three models, aurora-red-alpha, aurora-green-alpha and aurora-blue-alpha, briefly appeared in OpenAI’s API and were removed; within hours they showed up in blind image-generation battles on Arena.
Status
- Claim
Partly confirmed
- Our reporting
- Medium confidence
- Importance
- 2 of 5
- Last verified
- 18 October 2026
Your AI and this story
- GPT-6 Astra170 days after its cutoff
- Claude Opus 5.5109 days after its cutoff
- Gemini 4 Argon200 days after its cutoff
- Grok 4.7139 days after its cutoff
None of these four assistants can know about it. The closest, Claude Opus 5.5, stops 109 days before it.
Key facts
- Names: aurora-red-alpha, aurora-green-alpha, aurora-blue-alpha; first spotted via an alert on the Dev Mode Discord server, then removed from the API (TestingCatalog suggests an accidental rollout)
- Arena: Lumina Bench (@LuminaBench) reported all three as image models in blind tests; red was faster but lower quality, green slower and better; blue untested at the time
- Attribution to GPT-Image-3 is a guess by TestingCatalog and Lumina Bench, not confirmed by OpenAI
- Separate, unlinked: three new Design Arena entries named Aspen, Cypress and Maple were reported by @kdnbmb about an hour later
- Previous OpenAI image release in the dataset period: ChatGPT Images 2.5 (API: GPT-Image-2.5 Flare for speed, Sunburst for precision), per TestingCatalog’s background
What happened
Model identifiers for three “aurora” variants were visible in OpenAI’s API for a short time and then removed. Hours later the same names appeared on Arena (arena.ai), where testers compare image models blind. Early samples (cat portraits) were judged clean and detailed but not striking. Nothing ties the names to a product yet.
Why it matters
Arena appearances have preceded most recent OpenAI image releases, so this is a likely early sign of a new image model. It is a leak: treat the GPT-Image-3 label as speculation until OpenAI announces something. Exact date of the API sighting (Oct 17 or 18) is not given in the article; the entry uses Oct 17.
Sources
1 source from 1 site. Numbers match the chips in the text.
1 source: 1 press
Press
- TestingCatalog: OpenAI possibly testing GPT-Image-3 (‘Aurora’ models on Arena), Oct 18testingcatalog.com, press
Changes
- Filed (evening)