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How to Prepare Claude Code for a Claude Fable 5 Relay

A working Claude Code relay configuration cannot be published from the available verified information: the relay endpoint, credential format, and Claude Code-specific setting locations are not provided. The confirmed model identifier is claude-fable-5; use that identifier only after the relay operator supplies a compatible Claude Code setup method.

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

The exact Claude Code location for a relay URL and API key is Not yet measured. The supplied relay data lists models and pricing data, but it does not document a Claude Code settings screen, a configuration-file path, supported environment variables, or a command-line flag for changing an endpoint.

Do not infer the setting from examples written for another coding client. A field named base_url, an environment variable name, and the accepted endpoint path are integration-specific details. Before changing a local configuration, obtain the relay operator’s current Claude Code instructions and verify that they explicitly identify the configuration location, the endpoint value, and the credential format.

For a team-managed setup, record the source of each value separately: the relay endpoint, the API credential, the selected model, and any organization-level policy. That separation makes it easier to review a change later and avoids treating a model name as though it were an endpoint or a credential.

If the operator provides multiple endpoint formats, use the one documented specifically for Claude Code. A URL intended for another API protocol may look plausible in a configuration file while still producing an authentication, route, or request-format error.

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

A verified, copy-paste Claude Code configuration is Not yet measured. The available record confirms claude-fable-5 as a listed Anthropic conversation model, but it does not establish which Claude Code configuration syntax, API compatibility mode, endpoint path, or authentication header the relay accepts.

The part that can be preserved exactly is the model identifier: claude-fable-5. Do not replace it with a display label such as “Claude Fable 5,” and do not assume that an alias will resolve to the same target. Model IDs should be copied exactly from the source that issued the integration instructions.

Treat any configuration template without an operator-supplied endpoint and key format as a planning checklist rather than an executable file. The required values to confirm are: the full relay URL, the API key placement method, the model selection field, whether the client needs a protocol mode, and whether a restart or new shell session is required.

Keep the credential outside source control and avoid pasting it into issue trackers, shell history shared with others, or project configuration that is committed to a repository. This is an operational precaution, not evidence that any particular Claude Code storage mechanism is supported by this relay.

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

Verify the integration with a small, non-sensitive request and with relay-side usage or request evidence if the operator exposes it. A successful response by itself does not prove which endpoint, credential, or model was used, especially when older local settings or inherited environment values may still be present.

Start by confirming the effective configuration after restarting the process that launches Claude Code. Then send a simple prompt that does not contain repository secrets, customer data, or production credentials. Record the time, the configured model value claude-fable-5, and the result returned by the client.

Next, compare that test with the relay operator’s available request history, usage display, or support diagnostics. The available facts do not state whether such observability exists, so its availability is Not yet measured. If there is no visible request record, ask the operator how they recommend confirming endpoint routing without disclosing the key.

Do not use latency, token totals, context behavior, or output style as proof of routing. No Claude Code-specific latency, context, request-limit, or compatibility measurements are provided here. Those values are Not yet measured and should be validated in the deployment where the configuration will run.

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

An API error after a relay change should be treated first as a configuration mismatch, not as proof that claude-fable-5 is unavailable. The supplied data does not define relay endpoint paths, accepted authentication schemes, rate limits, quotas, or Claude Code request compatibility, so a specific root cause cannot be verified from the current record.

Check the configuration in a narrow order: confirm that the intended settings source is loaded, compare the endpoint character-for-character with the operator’s instruction, confirm that the credential is current, and confirm that the model value is exactly claude-fable-5. Restart the process between changes so that a cached setting is not mistaken for a new one.

If the error mentions authentication, preserve the status code and request timestamp but redact the credential before sharing logs. If it mentions an unknown model, provide the exact configured identifier and the endpoint host to the relay operator. If it mentions a limit, retain the full message and timestamp; the actual request limit and limit tiers are Not yet measured in the available facts.

Avoid repeatedly retrying a failing request with the same uncertain configuration. Repeated retries can make incident diagnosis harder and may create additional usage. A minimal reproducible test, redacted error text, client version, effective configuration source, and timestamp give support staff more useful information than a screenshot of a partially edited settings file.

How do I switch between Claude Fable 5 and other models in Claude Code?

Model switching in Claude Code is Not yet measured because the available information does not document Claude Code’s model selector, profile format, or per-project override behavior. The relay record does list other models, including claude-haiku-4-5-20251001, claude-opus-4-8, claude-sonnet-4-6, and claude-sonnet-5, but listing a model does not verify that it is selectable through this specific tool integration.

If the relay operator documents Claude Code model switching, use the exact model IDs from that documentation and keep one change per test. Change the selected model without changing the endpoint or credential at the same time; otherwise, an error cannot be attributed cleanly to model selection versus routing or authentication.

For claude-fable-5, the published base price is $10 per 1 million input tokens, $50 per 1 million output tokens, and $1 per 1 million cached-input tokens. Final pricing depends on the user’s group multiplier, so this page does not calculate a final cost or recommend a model by cost. Pricing and purchase decisions belong to the site’s dedicated pricing and access pages.

Before adopting a model-switching workflow for a repository or team, validate that the selected model remains visible in the effective Claude Code configuration and that the relay accepts the resulting request. Compatibility, switching persistence, rate behavior, and tool-specific feature support are Not yet measured and should not be assumed from the model catalog alone.

Still stuck? Full documentation and support are at OpenLux Claude Fable 5 API relay.

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Query the pricing API and confirm the account group first, then verify the Claude Fable 5 request path

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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.