Fix Claude Code Gateway Routing in T3 Code

To fix Claude Code gateway routing in T3 Code, make sure the provider selected in Claude Code matches the provider and endpoint configured in T3, then check the gateway’s model mapping and authentication. If the request still fails, test the gateway directly and inspect the error to determine whether the problem is routing, credentials, or model compatibility.

How Claude Code and a gateway fit together

Claude Code is a command-line coding tool that sends requests to a model service. A gateway sits between the client and that service: it accepts the request, applies its routing configuration, and forwards it to an upstream provider. “T3 Code” can refer to different T3 products or configurations, so exact screens and setting names may vary; confirm that the T3 service you use actually offers a Claude-compatible API gateway before applying these steps.

The key distinction is that choosing a provider in Claude Code does not automatically configure the gateway. Claude Code must send requests to the gateway’s address, and the gateway must know which upstream provider, credential, and model should handle them. A mismatch at any of those points can look like a general connection failure.

Check the provider settings first

Start by identifying the intended request path. If Claude Code should connect through T3, its configured API endpoint must be the gateway endpoint supplied by T3, not an unrelated default endpoint. The gateway’s provider setting, in turn, must target the upstream service that hosts the requested model.

• Endpoint: Use the exact base URL provided for the T3 gateway. Do not guess paths, append a second API path, or substitute a dashboard URL for an API URL.
• Provider: Select or configure the upstream provider that actually serves the requested model. A gateway’s label for a provider may differ from the name used by Claude Code.
• Credential: Put the gateway credential where Claude Code expects it, and configure the upstream credential in T3 if the gateway requires one. These may be separate tokens.
• Model: Confirm the model identifier is supported by both the gateway route and the upstream account. A familiar display name is not necessarily the API identifier.

Keep credentials private. Avoid pasting tokens into issue reports, screenshots, shell history, or shared configuration files. If a token has been exposed, revoke or rotate it through the service that issued it.

Reconnect Claude Code to the gateway

1. Read T3’s current gateway instructions and copy the documented API base URL and any required model or provider identifier.
2. Open Claude Code’s supported configuration method for your installation. Use its documented environment variables or settings rather than assuming that a setting from another client applies.
3. Set the endpoint to the T3 gateway and provide the gateway token using the documented credential variable or secure configuration mechanism. Do not place a real token in a command you plan to share.
4. Restart the Claude Code process or open a fresh terminal so it reads the updated environment. Existing processes generally do not acquire environment changes made after they started.
5. Send a small, non-sensitive request and verify that it reaches the intended model. If it fails, record the status code and error text with secrets removed.

Some gateways are compatible with Anthropic’s API; others expose a different interface or require a particular client configuration. Do not assume that changing a provider name alone makes an incompatible endpoint work. Follow T3’s instructions for Claude Code specifically, and use only configuration options documented by the gateway and client.

Verify the gateway route

A successful connection to the gateway does not prove that the upstream route is correct. Check T3’s routing or provider settings for the model named in the request. If T3 provides request logs, compare the requested model with the selected route and look for an upstream response or routing decision.

Where the gateway documents a compatible test request, use it to separate client-side configuration from gateway-side routing. A direct test can establish whether the endpoint and credential work, but it does not replace a Claude Code test: the client may send different headers, model names, or request fields.

• If a direct gateway test also fails, focus on the URL, token, gateway availability, and T3 provider setup.
• If the direct test succeeds but Claude Code fails, check the client’s endpoint and environment, the model identifier, and whether the gateway supports the request format Claude Code sends.
• If the gateway accepts the request but the upstream rejects it, check the upstream credential, account access, model availability, and route configuration.

Common errors and what they indicate

Connection or DNS errors usually point to a wrong host, unavailable service, network restriction, or malformed base URL. Copy the endpoint from the service documentation and check for accidental spaces or duplicated path segments.

Unauthorized or forbidden responses usually mean a missing, invalid, expired, or incorrectly scoped credential. Confirm whether Claude Code needs a gateway token while T3 separately needs an upstream provider key. Do not assume one credential serves both roles.

Model not found or route not found often means the requested model identifier does not match a route configured in T3. Check the exact spelling and whether the gateway expects an alias rather than the upstream provider’s public model name.

Bad request or unsupported feature can indicate that the gateway does not support a field or capability used by the client. Check the gateway’s compatibility notes and supported models. Changing unrelated provider settings is unlikely to fix an API-format mismatch.

Requests reach the wrong provider point to a route or default-provider issue. Review T3’s matching rules, model aliases, and fallback behavior. If multiple routes could match, make the intended model mapping explicit where the interface allows it.

Configuration hygiene and safe troubleshooting

Change one setting at a time and retest. This makes it easier to tell whether the fix was the endpoint, model mapping, or credential. Keep a record of non-secret settings that work, but never store API tokens in a public repository or include them in diagnostic output.

When reporting the issue to T3 support, provide the client version if known, the operating system, the non-secret endpoint hostname, the requested model identifier, approximate request time, and redacted error details. Do not include prompts or source code unless needed and safe to share. If the gateway exposes logs, check its documentation for how long logs are retained and what request data they contain.

Frequently Asked Questions

Does Claude Code automatically use the T3 gateway?
No. It must be configured to send requests to the gateway endpoint, and the gateway must have a matching upstream provider route.

Should I use my T3 token or my upstream provider key?
Use the credential specified for each connection. Claude Code may authenticate to T3 with a gateway token while T3 uses a separate provider key upstream. Check T3’s setup instructions.

Why does the gateway work in another client but not Claude Code?
The clients may use different endpoint settings, headers, model identifiers, or request formats. Confirm Claude Code’s supported configuration and the gateway’s compatibility requirements.

Will changing the model name fix routing?
Only if the requested name does not match a route or supported model. Check T3’s configured aliases and exact identifiers before changing it.

Where should I look when a request fails?
Start with Claude Code’s visible error, then check T3’s request or routing logs if available. The point where the failure appears helps distinguish client configuration from upstream rejection.

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