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How to verify a Claude Code relay setup for claude-opus-5

A copy-paste Claude Code relay configuration cannot be published responsibly from the available evidence. The supplied source confirms that claude-opus-5 is listed by the relay panel, but it does not document Claude Code settings, accepted environment variables, endpoint paths, or authentication behavior. Treat the steps below as a verification checklist rather than a ready-to-run setup guide.

Where do I change the base URL and API key in Claude Code?

The exact Claude Code location for a relay base URL and API key is Not yet measured. The available material contains relay-panel pricing data and model listings, but it does not include Claude Code documentation, a settings-screen capture, a configuration-file path, or a supported environment-variable reference.

Do not infer a setting name from another SDK, editor extension, or OpenAI-compatible client. Claude Code may use its own configuration precedence, credential storage, and endpoint expectations. Before changing anything, check the Claude Code version in use and its official local help or documentation, then identify the setting that explicitly controls the Anthropic endpoint and the setting that supplies the credential.

For a team-managed installation, also determine whether project-level settings, shell environment variables, user-level configuration, or an existing credential helper takes precedence. A valid key placed in the wrong layer can leave Claude Code calling its prior endpoint, which can look like a relay failure even when the relay itself was never contacted.

What is the complete Claude Code relay configuration?

A complete Claude Code configuration file or environment-variable example is Not yet measured. Publishing field names, file locations, command syntax, or a sample endpoint without a documented source would risk giving developers a configuration that does not apply to their Claude Code release.

The values that can be confirmed from the supplied relay data are limited: the listed model identifier is claude-opus-5, and the panel includes groups named Claude-Code-1 and Claude-Code-2. That does not establish that either group is selected automatically by Claude Code, that either one accepts a particular endpoint format, or that Claude Code supports relay routing through them.

When the relay operator provides the supported setup material, record the configuration exactly as supplied: the full base URL including any required version segment, the credential field or variable name, the model selector, and any headers required by the relay. Keep the key outside source control. If the tool supports a local config file, restrict its file permissions and use a separate key for development rather than reusing a shared production credential.

How do I verify that Claude Code is actually using claude-opus-5?

Verification should rely on an observable request and the relay’s own request or usage record; the exact verification workflow is Not yet measured. A successful Claude Code response alone is insufficient proof, because cached credentials or a higher-priority configuration layer may send the request somewhere other than the intended relay.

Start with a small, non-sensitive prompt in a disposable workspace after recording the active Claude Code version, the selected model string, and the time of the request. Then inspect the relay account’s available activity, usage, or request information for a matching event. Confirm that the model shown for that event is claude-opus-5, rather than assuming an alias resolved to it.

If the relay exposes no request-level visibility, ask its operator what evidence can confirm endpoint routing and model resolution. Do not claim latency, availability, rate-limit behavior, or successful tool-call support until those items are observed in the same configuration. All such operational results are Not yet measured from the provided information.

Why does Claude Code fail after I point it at a relay?

The likely cause cannot be diagnosed from the available source because no Claude Code error output, endpoint specification, or compatibility statement is provided. The first practical distinction is whether the failure occurs before a request leaves Claude Code, at authentication, during model selection, or after the relay receives the request.

Capture the exact error text, the command or action that triggered it, the active model identifier, and the sanitized endpoint host. Remove API keys, authorization headers, repository content, and personal data before sharing logs. This evidence lets the relay operator determine whether the issue is an invalid credential, an unsupported request shape, an unavailable model route, or a client-side configuration conflict.

A common troubleshooting mistake is changing the key, endpoint, model name, and client version at once. Change one variable at a time and rerun the same minimal request. If claude-opus-5 fails, do not substitute an unverified model merely to make the error disappear; first establish whether Claude Code accepts the relay’s API format and whether the relay recognizes the requested model identifier.

How do I switch models in Claude Code when using a relay?

The relay panel lists multiple Claude-family model identifiers, including claude-opus-5, claude-opus-4-8, claude-opus-4-7, claude-opus-4-6, claude-opus-4-5-20251101, claude-sonnet-5, claude-sonnet-4-6, claude-sonnet-4-5-20250929, claude-haiku-4-5-20251001, and claude-fable-5. Whether Claude Code can select each of these identifiers through this relay is Not yet measured.

Use the exact model identifier shown by the relay rather than shortening, translating, or guessing an alias. The available data calls claude-opus-5 a chat model, while several listed Claude entries are labeled as conversation models. Those labels are panel metadata; they do not prove that every listed model has identical Claude Code feature support, request parameters, or tool behavior.

For reliable switching, keep one known-good relay configuration fixed and modify only the model selector through the mechanism officially supported by the installed Claude Code version. Verify every switch with a separate observable request record. If a model is present in the panel but cannot be selected by Claude Code, report it as a compatibility gap rather than treating the listing alone as a guarantee of client support.

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Last updated 2026-08-05　|　Written and maintained by OpenLux.
Latency and pricing figures come from our own measurements. Where they differ from the vendor's site, the vendor's live page wins.