GPT-5.3 Codex vs GPT-5.5
openai/gpt-5.3-codex · openai/gpt-5.5
As of November 2, 2026, GPT-5.5 is the cheaper API on UberLLM: $0.1250 per million input tokens and $0.7500 per million output, versus $0.1794 / $1.44 for GPT-5.3 Codex, about 47% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose GPT-5.5 to cut cost; choose GPT-5.3 Codex when its capabilities fit your task better.
GPT-5.3 Codex vs GPT-5.5, side by side
| Spec | GPT-5.3 Codex | GPT-5.5 |
|---|---|---|
| Price · input / 1M | $0.1794 | $0.1250 |
| Price · output / 1M | $1.44 | $0.7500 |
| Context length | 400,000 | 1,000,000 |
| Max output tokens | 128,000 | 128,000 |
| Input modalities | text, image | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 89.8% off | 97.5% off |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 2, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
GPT-5.3 Codex vs GPT-5.5 — FAQ
Is GPT-5.3 Codex or GPT-5.5 cheaper?
GPT-5.5 is cheaper on a blended token mix, by about 47%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between GPT-5.3 Codex and GPT-5.5?
GPT-5.3 Codex: $0.1794 in / $1.44 out per 1M tokens. GPT-5.5: $0.1250 in / $0.7500 out per 1M tokens. That's roughly a 47% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GPT-5.3 Codex and GPT-5.5 with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.