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Configuring claude-sonnet-5 for Claude Code: Verified Setup Boundaries

A copy-paste Claude Code relay configuration cannot be provided from the available source material because it does not specify a relay endpoint, key format, environment-variable names, or Claude Code setting locations. What is verified is that claude-sonnet-5 appears in the relay catalog; validate the actual connection details in the operating panel and Claude Code documentation before using it in a development workflow.

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

The exact Claude Code location for changing a base URL or API key is not documented in the supplied facts. The available data contains model pricing, group multipliers, and model descriptions, but no Claude Code UI path, configuration-file path, command, setting name, or supported environment-variable name.

Do not infer an endpoint or variable name from another client. A relay URL format that works in one tool may not be accepted by Claude Code, and the supplied catalog does not establish an API compatibility mode for this tool. Obtain the endpoint, authentication method, and configuration location from the relevant operating panel and the Claude Code version you are running.

Before placing a key in any local setting, confirm which process will read it and whether project-level configuration overrides user-level configuration. Those behaviors are not described in the provided facts, so they need to be checked in your own installation rather than assumed from this page.

What is the complete Claude Code relay configuration for claude-sonnet-5?

A complete configuration file or environment-variable block is not available from the supplied facts. Publishing one would require inventing fields, file names, endpoint paths, or key names that have not been verified.

The verified model identifier is claude-sonnet-5. Keep that identifier unchanged wherever your confirmed Claude Code integration asks for a model value. Do not substitute a display name, translate it, or assume that a similarly named model resolves to the same catalog entry.

The source describes claude-sonnet-5 as a chat model. It also states that the model has a default and maximum context capacity of 1 million tokens and a maximum output token limit of 128k. Those model characteristics do not tell us which Claude Code settings expose them, whether the relay forwards every option, or which request schema Claude Code uses.

For that reason, a safe setup record should contain only values you can independently verify: the endpoint supplied by the panel, the key issued by the panel, the exact model identifier claude-sonnet-5, and the client-specific configuration syntax confirmed by Claude Code documentation. The relay catalog alone is not enough to fill in the missing syntax.

How do I verify that Claude Code is actually using the relay?

Verification should be based on an observable request result and the relay-side usage record, not only on a saved settings screen. The supplied facts do not document a dedicated health-check endpoint, test command, response header, request ID, or log format for this relay.

After applying the confirmed configuration, send a small non-sensitive coding request from Claude Code and inspect the client output and the operating panel records available to you. Confirm the model identifier shown by the relevant record is claude-sonnet-5 before treating the setup as active. If neither side exposes a model identifier, the available facts do not provide another reliable attribution method.

Do not use response style as proof of routing. A response that appears plausible does not establish which endpoint, group, or model handled the request. Likewise, the supplied source provides no latency, availability, SLA, or rate-limit figures, so those cannot be used as acceptance criteria here. Latency: Not yet measured. Availability: Not yet measured. Rate limit: Not yet measured.

Why does Claude Code show an API error after I add a relay?

The supplied facts do not provide error codes, error-message mappings, or Claude Code-specific troubleshooting steps. An “API error” therefore cannot be assigned to a bad key, malformed base URL, unsupported request format, missing model access, quota state, or rate limit from this information alone.

Start with the values that can be verified without guessing: confirm the configured model string is exactly claude-sonnet-5; confirm the endpoint and key came from the operating panel; and compare the actual Claude Code configuration syntax with documentation for the installed version. Treat each as a separate check rather than changing several values at once.

If the error mentions a rate limit, do not assume a published threshold exists. No rate-limit policy or numeric limit is included in the supplied facts. Capture the complete client error, timestamp, configured model identifier, and any relay-side request record before escalating. Remove secrets and source code from diagnostic material.

A further limitation is compatibility uncertainty. Listing claude-sonnet-5 in the relay catalog establishes that it is offered there, but it does not establish that every Claude Code feature, request option, tool call, streaming behavior, or authentication flow is supported through this relay. Test the specific workflow you depend on.

How do I switch models in Claude Code while keeping the relay configuration?

The catalog lists multiple Anthropic model identifiers, but the supplied facts do not state how Claude Code switches models or whether every listed model is compatible with Claude Code through this relay. Use only the model-selection mechanism documented for your installed client, and keep each identifier exactly as listed when it has been confirmed for your account.

Anthropic entries shown in the supplied catalog include claude-haiku-4-5-20251001, claude-opus-4-5-20251101, claude-opus-4-6, claude-opus-4-7, claude-opus-4-8, claude-opus-5, claude-sonnet-4-5-20250929, claude-sonnet-4-6, claude-sonnet-5, and claude-fable-5. The source also lists group names including Claude-Code-1, Claude-Code-2, Claude-1, AWS-Claude-1, Azure-Claude-1, and Anthropic-Claude-1.

A group name is not a Claude Code configuration instruction. The source gives multipliers and resource descriptions for groups, but it does not explain how a user is assigned to a group, how Claude Code selects one, or whether a group changes model availability. Do not put a group label into a model field unless the panel explicitly instructs you to do so.

For a controlled switch, change one confirmed model value at a time, run the same small verification request, and inspect the resulting usage record. This isolates model-selection issues from endpoint and credential issues. Cross-model behavior, feature parity, and tool compatibility are Not yet measured.

Still stuck? Full documentation and support are at https://api.openlux.ai.

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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.