Model comparison
GPT-5.3 Codex vs GPT-5.4
List rate, corouter rate, context, and which ID to send for gpt-5.3-codex versus gpt-5.4. 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 $1.10 on corouter (input $0.500, output $0.600).
| GPT-5.3 Codex | GPT-5.4 | |
|---|---|---|
| ID | gpt-5.3-codex | gpt-5.4 |
| Vendor | OpenAI | OpenAI |
| List input | $1.75 | $2.50 |
| corouter input | $0.350 | $0.500 |
| List output | $14.00 | $15.00 |
| corouter output | $2.80 | $3.00 |
| Cache read | $0.035 | $0.050 |
| Context | 272K | 1.1M |
Price gap
On output, GPT-5.3 Codex is lower: $2.80 on corouter versus $3.00 for GPT-5.4, about 1.07×. Input is $0.350 versus $0.500.
Window and modalities
GPT-5.4 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 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.
When to send gpt-5.4
GPT-5.4 is the general 1.05M GPT row beneath the Pro rate and above Mini. Send gpt-5.4 for chat, reasoning, and vision without the Pro multiplier.
Both are OpenAI IDs. The field you change is model: gpt-5.4 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 $1.10 on corouter (input $0.500, output $0.600).
Questions
- Which output rate is lower, GPT-5.3 Codex or GPT-5.4?
- On output, GPT-5.3 Codex is lower: $2.80 on corouter versus $3.00 for GPT-5.4, about 1.07×. Input is $0.350 versus $0.500.
- 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.