LiteLLM / LiteLLM

LiteLLM Proxy Authentication Error — Virtual Key Expired or Budget Exhausted

Fix LiteLLM proxy 401 authentication error when virtual API key expires or budget is exhausted Includes evidence for LiteLLM troubleshooting demand.

Source-backed Last updated May 13, 2026 3 sources Needs local verification

Category: LiteLLM
Error signature: litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted
Quick fix: Verify the account session, API key, provider settings, and environment where the failing tool is running.
Updated: May 13, 2026
Verification status: Source-backed
Evidence: 3 public source URLs

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for LiteLLM, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted is a LiteLLM failure pattern reported for developers trying to fix litellm proxy 401 authentication error when virtual api key expires or budget is exhausted. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Recent LiteLLM PR (May 2026) fixed three proxy auth error status code mappings: budget exhaustion→429, model allowlist denial→403, expired virtual keys→401. OpenHands SDK also added typed exception mapping for 401/403.

Common causes

LiteLLM proxy is widely used as an LLM routing layer. When virtual keys expire or team budgets are depleted, developers get confusing 401/403/429 errors. The proxy maps different conditions to different status codes, making debugging non-obvious.
Recent LiteLLM PR (May 2026) fixed three proxy auth error status code mappings: budget exhaustion→429, model allowlist denial→403, expired virtual keys→401. OpenHands SDK also added typed exception mapping for 401/403.

Quick fixes

Confirm the exact error signature matches litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted.
Check the LiteLLM account, local tool state, and provider configuration involved in the failing workflow.
Verify the account session, API key, provider settings, and environment where the failing tool is running.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted exactly before applying the quick fix.
Compare the failing environment with LiteLLM versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted mean in LiteLLM?

litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted indicates the workflow described by "LiteLLM Proxy Authentication Error — Virtual Key Expired or Budget Exhausted" failed in a LiteLLM context. Start by confirming the exact signature and the component that emitted it.

What should I check first for litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted?

Check whether this cause matches your environment: LiteLLM proxy is widely used as an LLM routing layer. When virtual keys expire or team budgets are depleted, developers get confusing 401/403/429 errors. The proxy maps different conditions to different status codes, making debugging non-obvious.

Is the litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted guidance source-backed?

The "LiteLLM Proxy Authentication Error — Virtual Key Expired or Budget Exhausted" page is labeled source-backed. It has 3 public source URLs from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted?

For "LiteLLM Proxy Authentication Error — Virtual Key Expired or Budget Exhausted", avoid applying "Verify the account session, API key, provider settings, and environment where the failing tool is running." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging litellm.AuthenticationError: 401 — Proxy virtual key expired or budget exhausted?

For "LiteLLM Proxy Authentication Error — Virtual Key Expired or Budget Exhausted", collect the failing LiteLLM command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.