Model comparison
Claude Sonnet 5 vs GPT-5.6 Terra
List rate, corouter rate, context, and which ID to send for claude-sonnet-5 versus gpt-5.6-terra. A sample of 1 million input tokens plus 200 thousand output tokens is about $0.800 on corouter (input $0.400, output $0.400). A sample of 1 million input tokens plus 200 thousand output tokens is about $0.880 on corouter (input $0.400, output $0.480).
| Claude Sonnet 5 | GPT-5.6 Terra | |
|---|---|---|
| ID | claude-sonnet-5 | gpt-5.6-terra |
| Vendor | Anthropic | OpenAI |
| List input | $2.00 | $2.00 |
| corouter input | $0.400 | $0.400 |
| List output | $10.00 | $12.00 |
| corouter output | $2.00 | $2.40 |
| Cache read | $0.040 | $0.040 |
| Context | 1M | 1.1M |
Price gap
On output, Claude Sonnet 5 is lower: $2.00 on corouter versus $2.40 for GPT-5.6 Terra, about 1.20×. Input is $0.400 versus $0.400.
Window and modalities
GPT-5.6 Terra lists a 1.1M window and Claude Sonnet 5 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 5 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-5
Claude Sonnet 5 lists below Sonnet 4.6 on both input and output and keeps the 1M window plus the Code tag. Send claude-sonnet-5 for that newer Sonnet ID.
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 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.
This ID uses the familiar chat-completions JSON shape. The other side is claude-sonnet-5 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 $0.800 on corouter (input $0.400, output $0.400).
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, Claude Sonnet 5 or GPT-5.6 Terra?
- On output, Claude Sonnet 5 is lower: $2.00 on corouter versus $2.40 for GPT-5.6 Terra, about 1.20×. Input is $0.400 versus $0.400.
- 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.