Model comparison
GPT-6 Astra vs Claude Opus 4.8
List rate, corouter rate, context, and which ID to send for gpt-6-astra versus claude-opus-4-8. 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 $2.00 on corouter (input $1.00, output $1.00).
| GPT-6 Astra | Claude Opus 4.8 | |
|---|---|---|
| ID | gpt-6-astra | claude-opus-4-8 |
| Vendor | OpenAI | Anthropic |
| List input | $10.00 | $5.00 |
| corouter input | $2.00 | $1.00 |
| List output | $50.00 | $25.00 |
| corouter output | $10.00 | $5.00 |
| Cache read | $0.200 | $0.100 |
| Context | 1.1M | 1M |
Price gap
On output, Claude Opus 4.8 is lower: $5.00 on corouter versus $10.00 for GPT-6 Astra, about 2.00×. Input is $1.00 versus $2.00.
Window and modalities
GPT-6 Astra lists a 1.1M window and Claude Opus 4.8 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 4.8 is listed with these modalities: Chat, Vision, Reasoning.
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-4-8 from Anthropic. corouter is not affiliated with OpenAI or Anthropic.
When to send claude-opus-4-8
Claude Opus 4.8 matches the Opus 5 list rate and window, without the Opus 5.5 cache-read cut. Send claude-opus-4-8 to keep an Opus 4.8 client unchanged.
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 $2.00 on corouter (input $1.00, output $1.00).
Questions
- Which output rate is lower, GPT-6 Astra or Claude Opus 4.8?
- On output, Claude Opus 4.8 is lower: $5.00 on corouter versus $10.00 for GPT-6 Astra, about 2.00×. Input is $1.00 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.