Try Out Kimi K3 in LangSmith LLM Gateway Run agents with Kimi 3 using just your LangSmith API key. LangSmith now provides access to open models out-of-the-box, powered by @FireworksAI_HQ. Get started today → https://docs.langchain.com/langsmith/llm-gateway-credits…

Gateway Credits - Docs by LangChain

Source: https://docs.langchain.com/langsmith/llm-gateway-credits Gateway Creditslet you call LangChain-hosted models through the standard LLM Gateway API without setting up a provider account or key. Authenticate with only yourLangSmith API key. Noprovider secretis required.The gateway routes each request based on its model ID. A hosted model slug such asmoonshotai/kimi\-k3uses Gateway Credits. A model ID that starts with a configured bring-your-own-key provider, such asanthropic/claude\-opus\-5, uses that provider’s secret instead.

Available models

Select a hosted model by ID in the request body. Model IDs are case-insensitive.

List every model available to your workspace, including configured bring-your-own-key providers and hosted models, with the standard model-list endpoint:

Use a returned model ID exactly as shown in themodelfield of a prompt request.

Prerequisites

Before using Gateway Credits:

• Your organization is on a paid plan (Developer, Plus, Startup, or Premier).
• You have a workspace-scopedLangSmith API keyattached to a role withgateway:invokeandworkspaces:readpermissions. SeeAdmin setupif you are unsure.

Make a call

Point an OpenAI-compatible client athttps://gateway\.smith\.langchain\.com/v1, authenticate with your LangSmith API key, and setmodelto a hosted model ID.

Supported endpoints

Hosted models use the same standard API formats as bring-your-own-key models:

For request examples and translation behavior, seeAPI formats.

Pricing

Gateway Credits are available on all paid plans besides Enterprise. Seethe pricing pagefor plan details and current rates. Gateway Credits are denominated inLangChain Credit Units (LCUs)at$1.50 per LCU; each call consumes LCUs based on token usage.Standard gatewayspend policiesapply to hosted-model traffic, so any organization, workspace, API key, or user cap you have configured also governs Gateway Credit usage. You can control Gateway Credit consumption with the same tools you use for bring-your-own-key providers. For example, cap a specific API key at $200/month across every provider, or set a workspace-wide daily limit that includes hosted-model calls.

Tracing

Like all gateway traffic, hosted-model calls are traced to LangSmith. For where traces land and how to control access to them, seeTraces, Engine, and access control.

Next steps

• Quickstart: make your first gateway-proxied call.
• API formats: call models through Chat Completions, Messages, or Responses.
• Spend policies: add cost limits to Gateway Credit usage.
• Direct model access: use provider-native APIs and model IDs.