Model comparison
GPT-5.3 Codex vs GPT-5.4 Pro
List rate, corouter rate, context, and which ID to send for gpt-5.3-codex versus gpt-5.4-pro. A sample of 1 million input tokens plus 200 thousand output tokens is about $0.910 on corouter (input $0.350, output $0.560). A sample of 1 million input tokens plus 200 thousand output tokens is about $13.20 on corouter (input $6.00, output $7.20).
| GPT-5.3 Codex | GPT-5.4 Pro | |
|---|---|---|
| ID | gpt-5.3-codex | gpt-5.4-pro |
| Vendor | OpenAI | OpenAI |
| List input | $1.75 | $30.00 |
| corouter input | $0.350 | $6.00 |
| List output | $14.00 | $180.00 |
| corouter output | $2.80 | $36.00 |
| Cache read | $0.035 | $0.600 |
| Context | 272K | 1.1M |
Price gap
On output, GPT-5.3 Codex is lower: $2.80 on corouter versus $36.00 for GPT-5.4 Pro, about 12.86×. Input is $0.350 versus $6.00.
Window and modalities
GPT-5.4 Pro lists a 1.1M window and GPT-5.3 Codex lists 272K. A larger window does not change the per-token rate. Prompts past the window need a split or a different ID. GPT-5.3 Codex is listed with these modalities: Chat, Reasoning, Code, Vision. GPT-5.4 Pro is listed with these modalities: Chat, Reasoning, Vision.
When to send gpt-5.3-codex
GPT-5.3 Codex is a coding ID with a 272K window. Its list rate matches GPT-5.2 Codex; the difference you bill is the ID itself, gpt-5.3-codex.
Both are OpenAI IDs. The field you change is model: gpt-5.3-codex or gpt-5.4-pro.
When to send gpt-5.4-pro
GPT-5.4 Pro is the outlier on the rate card: its list output rate is far above GPT-5.4. Send gpt-5.4-pro only when you have already chosen that ID on purpose.
Both are OpenAI IDs. The field you change is model: gpt-5.4-pro or gpt-5.3-codex.
The same volume, two bills
A sample of 1 million input tokens plus 200 thousand output tokens is about $0.910 on corouter (input $0.350, output $0.560).
A sample of 1 million input tokens plus 200 thousand output tokens is about $13.20 on corouter (input $6.00, output $7.20).
Questions
- Which output rate is lower, GPT-5.3 Codex or GPT-5.4 Pro?
- On output, GPT-5.3 Codex is lower: $2.80 on corouter versus $36.00 for GPT-5.4 Pro, about 12.86×. Input is $0.350 versus $6.00.
- Is corouter affiliated with the model vendors?
- No. corouter is not affiliated with OpenAI or Anthropic. Vendor names identify the model and the published list rate.
- How do you start billing?
- Create a console account and spend prepaid credits. The minimum top-up is $5. The API base is https://api.corouter.co. Put the ID you chose in the model field.