Model
ChatGPT 5.5 Ultra API Access: OpenAI-Compatible
Buy ChatGPT 5.5 Ultra API access through unlimitedcodex with unlimited token consumption, 4 concurrent connections, and flat $19/week or $76/month pricing.
Open modelModel access
ChatGPT 5.5 Ultra and Codex API access pages.
Review model-specific pages for ChatGPT 5.5 Ultra and Codex API workflows, including pricing, delivery, endpoint fit, and the 4 concurrent connections boundary.
Last updated 2026-07-12
Model
Codex API Access: OpenAI-Compatible
Buy ChatGPT 5.5 Ultra API access while 5.6 variants are paused with unlimited token consumption, 4 concurrent connections, and flat weekly or monthly pricing.
Open modelFAQ
Which model is the active public recommendation?
ChatGPT 5.5 Ultra is the active recommended public model while 5.6 Sol and related variants are temporarily restricted for stability.
Where do exact model IDs come from?
Exact model IDs come from the delivered setup email and should be verified with GET /v1/models against the delivered base URL before long runs.