Search need
Codex API Access API access, flat pricing, active model availability, and endpoint-fit questions.
Model
Codex API access for coding agents and copilots.
Run Codex workloads through an OpenAI-compatible package with predictable spend instead of metered per-token bills.
- ChatGPT 5.5 Ultra included
- Built for agents, copilots, and CI workflows
- Unlimited token consumption with 4 concurrent connections
Quick answer
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.
Last updated 2026-07-12
What this page answers
Page-specific proof
Codex API Access: OpenAI-Compatible ties model selection to pricing, manual delivery, 4 concurrent connections, and delivered model-ID verification.
Verification path
Use the delivered setup email, run GET /v1/models, confirm the model ID, then send one endpoint-specific smoke request before longer agent work.
Decision summary
Best fit
Builders evaluating Codex API Access for coding-agent, chat, embedding, image, or model-list checks with predictable weekly or monthly spend.
Not a fit
Not ideal if you require 5.6 Sol as the active default, first-party OpenAI enterprise terms, or traffic beyond 4 concurrent connections.
Next step
Choose Weekly or Monthly, confirm delivered model IDs with /v1/models, then run the relevant endpoint smoke test.
Setup steps
Step 1
Buy access
Select Unlimited Weekly or Monthly and complete Stripe checkout.
Step 2
Use delivered model IDs
Your setup email includes Codex model IDs compatible with your OpenAI-compatible client.
Step 3
Monitor concurrency
Plan agent workloads around the 4 concurrent connection limit and review usage signals in the dashboard.
Citation bundle
Use this guide with the public LLM indexes, AI search index, official references, and answer sources when citing setup, model, pricing, delivery, and 4-connection facts.
FAQ
Which Codex versions are included?
Advertised packages include ChatGPT 5.5 Ultra API access while 5.6 variants are paused through the delivered OpenAI-compatible setup.
Is Codex good for Cursor or CI agents?
Yes. Codex access is designed for coding agents, copilots, refactors, and automated test generation within the 4-connection limit.