OpenAI quietly lists three undocumented "aurora" alpha models in its API
OpenAI quietly added three undocumented "aurora" alpha model IDs to its developer API — reported Oct 18 after an X post by researcher @scaling01. No pricing, docs, or changelog exists. The name echoes an aurora-alpha model on OpenRouter since February 2026, speculated to link to GPT-5.3-Codex-Spark,
What happened
On October 18, 2026, three new model identifiers — aurora-red-alpha, aurora-green-alpha, and aurora-blue-alpha — appeared in OpenAI's developer API interface, first surfaced by AI researcher @scaling01 on X. OpenAI has not announced them, documented them, published pricing or rate limits, or added a changelog entry. The "aurora" name is not new: an aurora-alpha model appeared on OpenRouter in February 2026 and is speculatively linked to a GPT-5.3-Codex-Spark variant, but OpenAI has confirmed nothing.
Why it matters
Theories that the red/green/blue versions relate to Codex optimizations or faster inference are unverified speculation. Developers should not build production systems around undocumented alpha endpoints with no published pricing or capability notes.
Verified October 17, 2026.
Sources
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