Model comparison
GPT-6 Astra vs GPT-5.3 Codex
List rate, corouter rate, context, and which ID to send for gpt-6-astra versus gpt-5.3-codex. A sample of 1 million input tokens plus 200 thousand output tokens is about $4.00 on corouter (input $2.00, output $2.00). A sample of 1 million input tokens plus 200 thousand output tokens is about $0.910 on corouter (input $0.350, output $0.560).
| GPT-6 Astra | GPT-5.3 Codex | |
|---|---|---|
| ID | gpt-6-astra | gpt-5.3-codex |
| Vendor | OpenAI | OpenAI |
| List input | $10.00 | $1.75 |
| corouter input | $2.00 | $0.350 |
| List output | $50.00 | $14.00 |
| corouter output | $10.00 | $2.80 |
| Cache read | $0.200 | $0.035 |
| Context | 1.1M | 272K |
Price gap
On output, GPT-5.3 Codex is lower: $2.80 on corouter versus $10.00 for GPT-6 Astra, about 3.57×. Input is $0.350 versus $2.00.
Window and modalities
GPT-6 Astra 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-6 Astra is listed with these modalities: Chat, Reasoning, Code, Vision. GPT-5.3 Codex is listed with these modalities: Chat, Reasoning, Code, Vision.
When to send gpt-6-astra
GPT-6 Astra is the highest standard list rate in the GPT rows here. Send gpt-6-astra when the task is worth that output rate and you want the 1.05M window with image input.
Both are OpenAI IDs. The field you change is model: gpt-6-astra or gpt-5.3-codex.
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-6-astra.
The same volume, two bills
A sample of 1 million input tokens plus 200 thousand output tokens is about $4.00 on corouter (input $2.00, output $2.00).
A sample of 1 million input tokens plus 200 thousand output tokens is about $0.910 on corouter (input $0.350, output $0.560).
Questions
- Which output rate is lower, GPT-6 Astra or GPT-5.3 Codex?
- On output, GPT-5.3 Codex is lower: $2.80 on corouter versus $10.00 for GPT-6 Astra, about 3.57×. Input is $0.350 versus $2.00.
- 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.