Model comparison
Claude Sonnet 4.6 vs GPT-5.6 Terra
List rate, corouter rate, context, and which ID to send for claude-sonnet-4-6 versus gpt-5.6-terra. A sample of 1 million input tokens plus 200 thousand output tokens is about $4.80 on corouter (input $2.40, output $2.40). A sample of 1 million input tokens plus 200 thousand output tokens is about $0.440 on corouter (input $0.200, output $0.240).
| Claude Sonnet 4.6 | GPT-5.6 Terra | |
|---|---|---|
| ID | claude-sonnet-4-6 | gpt-5.6-terra |
| Vendor | Anthropic | OpenAI |
| List input | $3.00 | $2.00 |
| corouter input | $2.40 | $0.200 |
| List output | $15.00 | $12.00 |
| corouter output | $12.00 | $1.20 |
| Cache read | $0.240 | $0.020 |
| Context | 1M | 1.1M |
Price gap
On output, GPT-5.6 Terra is lower: $1.20 on corouter versus $12.00 for Claude Sonnet 4.6, about 10.00×. Input is $0.200 versus $2.40.
Window and modalities
GPT-5.6 Terra lists a 1.1M window and Claude Sonnet 4.6 lists 1M. A larger window does not change the per-token rate. Prompts past the window need a split or a different ID. Claude Sonnet 4.6 is listed with these modalities: Chat, Vision, Code. GPT-5.6 Terra is listed with these modalities: Chat, Reasoning, Vision.
When to send claude-sonnet-4-6
Claude Sonnet 4.6 keeps the previous Sonnet list rate, above Sonnet 5, with a 1M window and the Code tag. Send claude-sonnet-4-6 when a runbook still names it.
This ID uses the familiar messages JSON shape. The other side is gpt-5.6-terra from OpenAI. corouter is not affiliated with OpenAI or Anthropic.
When to send gpt-5.6-terra
GPT-5.6 Terra is the lower GPT-5.6 list rate and does not carry the Code tag. Send gpt-5.6-terra for long-context chat and vision at that rate.
This ID uses the familiar chat-completions JSON shape. The other side is claude-sonnet-4-6 from Anthropic. corouter is not affiliated with OpenAI or Anthropic.
The same volume, two bills
A sample of 1 million input tokens plus 200 thousand output tokens is about $4.80 on corouter (input $2.40, output $2.40).
A sample of 1 million input tokens plus 200 thousand output tokens is about $0.440 on corouter (input $0.200, output $0.240).
Questions
- Which output rate is lower, Claude Sonnet 4.6 or GPT-5.6 Terra?
- On output, GPT-5.6 Terra is lower: $1.20 on corouter versus $12.00 for Claude Sonnet 4.6, about 10.00×. Input is $0.200 versus $2.40.
- 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.