Choosing this model
Selection advice by Y-API. The checks below are suggested evaluations, not published test results.
Where to start
Use it for workflows that span many steps rather than a single prompt: a repository-wide change, a migration plan that has to stay consistent, or an agent that has to hold context across a long session.
What to watch for
Anthropic publishes no open weights for this model, so there is no model card to cite and no way to inspect the checkpoint behind the API. The catalog price matches newer Opus entries, which makes the older version hard to justify on cost alone.
Model specifications
These are OpenRouter model-level specifications, not a Y-API compatibility test. A particular route may accept fewer input formats, parameters or tokens. Verify the features you need with a small request; a successful text response does not validate vision or tool calling.
- Context window
- 1,000,000 tokens
- Input
- Text · Image · File
- Output
- Text
- Listed on OpenRouter
- Parameters listed by OpenRouter
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatstopstructured_outputstemperaturetool_choicetoolstop_ktop_pverbosity
API pricing & cost estimate
- Estimated credit consumed
- $17.50
- Estimated cash equivalent
- $1.75
Illustrative token budget, not measured usage or a quote. Includes input and output; excludes separate media charges, cache discounts and retries. Include billed reasoning tokens in your output budget where applicable. Actual billing follows usage returned by the service.
$1 paid adds $10 of credit. Cash equivalent = credit consumed ÷ 10; this is not the model publisher’s list price.
| Model | Estimated credit consumed | Estimated cash equivalent |
|---|---|---|
| Claude Opus 4.6 | $17.50 | $1.75 |
| Claude Opus 4.7 | $17.50 | $1.75 |
| Claude Opus 5 | $17.50 | $1.75 |
API integration examples
These minimal, text-only requests use the exact Y-API model ID. They do not demonstrate image, audio, video, file or tool support. The output limit also needs room for reasoning; an empty answer with finish_reason=length can mean the budget was exhausted.
A task to try
Here is a failing integration test and the module it exercises. Identify the root cause before proposing a fix, and say what evidence would confirm your diagnosis.
Set the TOKEN environment variable to a key from your console. Run this on your server or locally; never expose a key in browser code or a public repository.
curl --fail-with-body --silent --show-error --max-time 120 \
'https://api.y-api.bestvirtualgoods.com/v1/chat/completions' \
-H "Authorization: Bearer ${TOKEN:?Set TOKEN first}" \
-H 'Content-Type: application/json' \
--data-binary @- <<'JSON'
{
"model": "anthropic/claude-opus-4.6",
"messages": [
{
"role": "user",
"content": "Here is a failing integration test and the module it exercises. Identify the root cause before proposing a fix, and say what evidence would confirm your diagnosis."
}
],
"max_tokens": 4096
}
JSONHow to evaluate the result
The diagnosis should point at a specific line and predict an observable consequence. A fix that makes the test pass without explaining the cause is not a pass.
Before you choose
Is there a model card for this Opus version?
No. Anthropic distributes Claude under closed weights, so the catalog records no publisher card rather than linking an unrelated repository. The OpenRouter model page is the specification source cited here.
Sources & scope
Technical facts come from the cited model page and, where available, its linked publisher card. A card describes that checkpoint; it is not proof of the weights a gateway serves. Prices come only from the Y-API catalog. We do not claim measured latency, uptime or benchmark scores for this endpoint.