Model comparison
GPT-5.5 vs GPT-5.6 Terra
List rate, corouter rate, context, and which ID to send for gpt-5.5 versus gpt-5.6-terra. A sample of 1 million input tokens plus 200 thousand output tokens is about $2.20 on corouter (input $1.00, output $1.20). A sample of 1 million input tokens plus 200 thousand output tokens is about $0.880 on corouter (input $0.400, output $0.480).
| GPT-5.5 | GPT-5.6 Terra | |
|---|---|---|
| ID | gpt-5.5 | gpt-5.6-terra |
| Vendor | OpenAI | OpenAI |
| List input | $5.00 | $2.00 |
| corouter input | $1.00 | $0.400 |
| List output | $30.00 | $12.00 |
| corouter output | $6.00 | $2.40 |
| Cache read | $0.100 | $0.040 |
| Context | 1.1M | 1.1M |
Price gap
On output, GPT-5.6 Terra is lower: $2.40 on corouter versus $6.00 for GPT-5.5, about 2.50×. Input is $0.400 versus $1.00.
Window and modalities
Both windows are 1.1M. GPT-5.5 is listed with these modalities: Chat, Reasoning, Code, Vision. GPT-5.6 Terra is listed with these modalities: Chat, Reasoning, Vision.
When to send gpt-5.5
GPT-5.5 keeps the high GPT-5.6 Sol list rate and the Code tag. Send gpt-5.5 when a workload was already qualified on that exact ID.
Both are OpenAI IDs. The field you change is model: gpt-5.5 or gpt-5.6-terra.
When to send gpt-5.6-terra
GPT-5.6 Terra sits between Sol and Luna on the GPT-5.6 rate card and does not carry the Code modality tag. Send gpt-5.6-terra for long-context chat and vision at the mid rate.
Both are OpenAI IDs. The field you change is model: gpt-5.6-terra or gpt-5.5.
The same volume, two bills
A sample of 1 million input tokens plus 200 thousand output tokens is about $2.20 on corouter (input $1.00, output $1.20).
A sample of 1 million input tokens plus 200 thousand output tokens is about $0.880 on corouter (input $0.400, output $0.480).
Questions
- Which output rate is lower, GPT-5.5 or GPT-5.6 Terra?
- On output, GPT-5.6 Terra is lower: $2.40 on corouter versus $6.00 for GPT-5.5, about 2.50×. Input is $0.400 versus $1.00.
- 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.