GPT-5.5 & Codex API Comparison
Compare independent OpenAI-compatible GPT-5.5 and Codex API access at $19/week or $76/month against OpenAI's per-token billing.
TL;DR
OpenAI charges per token — heavy Codex and GPT-5.5 usage gets expensive fast. unlimitedcodex gives you OpenAI-compatible GPT-5.5 and Codex API access with unlimited tokens on a flat subscription.
Verdict
OpenAI wins on official first-party access and enterprise contracts. unlimitedcodex wins on independent OpenAI-compatible GPT-5.5 and Codex access with unlimited tokens at a flat price.
Real cost example
A heavy Codex and GPT-5.5 coding workload where metered alternatives vary by token volume, model mix, platform fees, and current provider pricing.
OpenAI API
Metered by provider pricing; final cost depends on token volume, model mix, and account terms.
Estimated monthly cost at scale
unlimitedcodex
$76/month, $59 first Monthly payment with UNLIMITED59, or $19/week for short sprints
Unlimited GPT-5.5, Codex, and advertised endpoints
Why teams switch
At a glance
| Dimension | OpenAI API | unlimitedcodex |
|---|---|---|
| GPT-5.5 & Codex | First-party, per-token billing | Unlimited tokens included |
| Pricing model | Pure pay-as-you-go per token, request, or modality with batch and priority tiers. | Flat Unlimited Weekly ($19) or Unlimited Monthly ($76) subscriptions with unlimited token consumption and Stripe billing. |
| Starting price | Usage-only per-token pricing with model-specific rates. | Unlimited Weekly: $19/week — advertised endpoints, unlimited tokens |
| Token limits | Per-token metering | Unlimited consumption |
| Best for | Teams committed to OpenAI models and needing latest capabilities | Developers who need unlimited GPT-5.5 and Codex API access at a fixed price |
Feature comparison
OpenAI API
First-party OpenAI API access to GPT-5.5, Codex, and official OpenAI model IDs with per-token billing.
unlimitedcodex
Independent OpenAI-compatible GPT-5.5 and Codex API access with unlimited token consumption on a flat subscription.
Use OpenAI for official first-party access and instant self-serve keys. Use unlimitedcodex for independent OpenAI-compatible access with predictable spend.
OpenAI API
Per-token metering — heavy GPT-5.5 inputs and outputs add up quickly on coding workloads.
unlimitedcodex
Unlimited Weekly $19/week or Unlimited Monthly $76/month — unlimited tokens included.
Choose OpenAI for low-volume or enterprise contracts. Choose unlimitedcodex for unlimited heavy usage.
OpenAI API
50M tokens/month on GPT-5.5 can cost $400–$800+ depending on input/output mix.
unlimitedcodex
$76/month flat regardless of token volume. $19/week for short sprints.
Heavy Codex and GPT-5.5 users save significantly on unlimitedcodex.
Pricing
| Item | OpenAI API | unlimitedcodex |
|---|---|---|
| GPT-5.5 pricing | Per-token metering by usage mix | Unlimited tokens included |
| Codex pricing | Per-token, scales with agent usage | Unlimited tokens included |
| 50M tokens/month | ~$400–$800+/month | $76/month flat |
| Weekly sprint | Varies — often $50–$150+/week | $19/week flat |
Strengths & limitations
Migration
Difficulty: easy. Point base URL to api.openai.com/v1 with an OpenAI key and official model IDs. Reverse migration to unlimitedcodex is equally simple with a base URL swap.
Generate migration codeYes. Unlimited Weekly and Unlimited Monthly packages include GPT-5.5, Codex, embeddings, and image endpoints with unlimited token consumption. Change base URL and API key — keep your existing SDK code.
No. unlimitedcodex is an independent OpenAI-compatible API access service. Choose OpenAI API directly when you need official first-party OpenAI account features, support, or enterprise contracts.
unlimitedcodex is a strong OpenAI API alternative for unlimited GPT-5.5 and Codex API access at $19/week or $76/month. OpenAI charges per token — heavy Codex and GPT-5.5 usage gets expensive fast. unlimitedcodex gives you OpenAI-compatible GPT-5.5 and Codex API access with unlimited tokens on a flat subscription.
OpenAI API uses pure pay-as-you-go per token, request, or modality with batch and priority tiers.. unlimitedcodex offers unlimited tokens on Unlimited Weekly at $19/week and Unlimited Monthly at $76/month ($59 first month with UNLIMITED59).
OpenAI API remains the better fit when teams committed to openai models and needing latest capabilities and production apps with predictable, metered usage budgets.
Migration difficulty is easy. Point base URL to api.openai.com/v1 with an OpenAI key and official model IDs. Reverse migration to unlimitedcodex is equally simple with a base URL swap. After Stripe payment, setup delivery is expected in 10 minutes to 5 hours.
Unlimited GPT-5.5 & Codex
Unlimited Weekly $19/week | Unlimited Monthly $76/month | Monthly first month $59 with UNLIMITED59