Model comparison
Claude Opus 4.8 vs GPT-5.4
List rate, corouter rate, context, and which ID to send for claude-opus-4-8 versus gpt-5.4. 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 $1.10 on corouter (input $0.500, output $0.600).
| Claude Opus 4.8 | GPT-5.4 | |
|---|---|---|
| ID | claude-opus-4-8 | gpt-5.4 |
| Vendor | Anthropic | OpenAI |
| List input | $5.00 | $2.50 |
| corouter input | $1.00 | $0.500 |
| List output | $25.00 | $15.00 |
| corouter output | $5.00 | $3.00 |
| Cache read | $0.100 | $0.050 |
| Context | 1M | 1.1M |
Price gap
On output, GPT-5.4 is lower: $3.00 on corouter versus $5.00 for Claude Opus 4.8, about 1.67×. Input is $0.500 versus $1.00.
Window and modalities
GPT-5.4 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. Claude Opus 4.8 is listed with these modalities: Chat, Vision, Reasoning. GPT-5.4 is listed with these modalities: Chat, Reasoning, Vision.
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-5.4 from OpenAI. corouter is not affiliated with OpenAI or Anthropic.
When to send gpt-5.4
GPT-5.4 is the general 1.05M GPT row beneath the Pro rate and above Mini. Send gpt-5.4 for chat, reasoning, and vision without the Pro multiplier.
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.
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 $1.10 on corouter (input $0.500, output $0.600).
Questions
- Which output rate is lower, Claude Opus 4.8 or GPT-5.4?
- On output, GPT-5.4 is lower: $3.00 on corouter versus $5.00 for Claude Opus 4.8, about 1.67×. Input is $0.500 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.