Model comparison
Claude Opus 4.8 vs Claude Sonnet 5
List rate, corouter rate, context, and which ID to send for claude-opus-4-8 versus claude-sonnet-5. A sample of 1 million input tokens plus 200 thousand output tokens is about $2.00 on corouter (input $1.00, output $1.00). A sample of 1 million input tokens plus 200 thousand output tokens is about $0.800 on corouter (input $0.400, output $0.400).
| Claude Opus 4.8 | Claude Sonnet 5 | |
|---|---|---|
| ID | claude-opus-4-8 | claude-sonnet-5 |
| Vendor | Anthropic | Anthropic |
| List input | $5.00 | $2.00 |
| corouter input | $1.00 | $0.400 |
| List output | $25.00 | $10.00 |
| corouter output | $5.00 | $2.00 |
| Cache read | $0.100 | $0.040 |
| Context | 1M | 1M |
Price gap
On output, Claude Sonnet 5 is lower: $2.00 on corouter versus $5.00 for Claude Opus 4.8, about 2.50×. Input is $0.400 versus $1.00.
Window and modalities
Both windows are 1M. Claude Opus 4.8 is listed with these modalities: Chat, Vision, Reasoning. Claude Sonnet 5 is listed with these modalities: Chat, Vision, Code.
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.
Both are Anthropic IDs. The field you change is model: claude-opus-4-8 or claude-sonnet-5.
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.
Both are Anthropic IDs. The field you change is model: claude-sonnet-5 or claude-opus-4-8.
The same volume, two bills
A sample of 1 million input tokens plus 200 thousand output tokens is about $2.00 on corouter (input $1.00, output $1.00).
A sample of 1 million input tokens plus 200 thousand output tokens is about $0.800 on corouter (input $0.400, output $0.400).
Questions
- Which output rate is lower, Claude Opus 4.8 or Claude Sonnet 5?
- On output, Claude Sonnet 5 is lower: $2.00 on corouter versus $5.00 for Claude Opus 4.8, 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.