Model comparison
GPT-6 Astra vs Claude Opus 5.5
List rate, corouter rate, context, and which ID to send for gpt-6-astra versus claude-opus-5-5. 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 $1.60 on corouter (input $0.800, output $0.800).
| GPT-6 Astra | Claude Opus 5.5 | |
|---|---|---|
| ID | gpt-6-astra | claude-opus-5-5 |
| Vendor | OpenAI | Anthropic |
| List input | $10.00 | $4.00 |
| corouter input | $2.00 | $0.800 |
| List output | $50.00 | $20.00 |
| corouter output | $10.00 | $4.00 |
| Cache read | $0.200 | $0.040 |
| Context | 1.1M | 1M |
Price gap
On output, Claude Opus 5.5 is lower: $4.00 on corouter versus $10.00 for GPT-6 Astra, about 2.50×. Input is $0.800 versus $2.00.
Window and modalities
GPT-6 Astra lists a 1.1M window and Claude Opus 5.5 lists 1M. 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. Claude Opus 5.5 is listed with these modalities: Chat, Vision, Reasoning, Code.
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.
This ID uses the familiar chat-completions JSON shape. The other side is claude-opus-5-5 from Anthropic. corouter is not affiliated with OpenAI or Anthropic.
When to send claude-opus-5-5
Claude Opus 5.5 is the lower Opus list rate in this catalog, with a cheaper cache read than Opus 5 and a Code tag. Send claude-opus-5-5 when you want that ID specifically.
This ID uses the familiar messages JSON shape. The other side is gpt-6-astra from OpenAI. 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 $4.00 on corouter (input $2.00, output $2.00).
A sample of 1 million input tokens plus 200 thousand output tokens is about $1.60 on corouter (input $0.800, output $0.800).
Questions
- Which output rate is lower, GPT-6 Astra or Claude Opus 5.5?
- On output, Claude Opus 5.5 is lower: $4.00 on corouter versus $10.00 for GPT-6 Astra, about 2.50×. Input is $0.800 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.