LiteLLM / LiteLLM

Fix LiteLLM OpenAI Inference Broken in SDK v1.81.1 — Client Closed Error

fix LiteLLM Cannot send a request as the client has been closed RuntimeError OpenAI SDK Includes evidence for LiteLLM troubleshooting demand.

Source-backed Last updated May 15, 2026 1 source Needs local verification

Category: LiteLLM
Error signature: RuntimeError: Cannot send a request, as the client has been closed.
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 15, 2026
Verification status: Source-backed
Evidence: 1 public source URL

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

RuntimeError: Cannot send a request, as the client has been closed. is a LiteLLM failure pattern reported for developers trying to fix litellm cannot send a request as the client has been closed runtimeerror openai sdk. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

22 comments. Traceback shows httpx client closed before request sent. Affects GPT 5.2 via LiteLLM Python SDK. Previous versions work without issues. Confirmed regression in v1.81.1.

Common causes

LiteLLM SDK v1.81.1 breaks OpenAI inference with 'RuntimeError: Cannot send a request, as the client has been closed.' Regression from previous working version. Affects production deployments using LiteLLM as OpenAI proxy.
22 comments. Traceback shows httpx client closed before request sent. Affects GPT 5.2 via LiteLLM Python SDK. Previous versions work without issues. Confirmed regression in v1.81.1.

Quick fixes

Confirm the exact error signature matches RuntimeError: Cannot send a request, as the client has been closed..
Check the LiteLLM account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

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 RuntimeError: Cannot send a request, as the client has been closed. 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 RuntimeError: Cannot send a request, as the client has been closed. mean in LiteLLM?

RuntimeError: Cannot send a request, as the client has been closed. indicates the workflow described by "Fix LiteLLM OpenAI Inference Broken in SDK v1.81.1 — Client Closed Error" failed in a LiteLLM context. Start by confirming the exact signature and the component that emitted it.

What should I check first for RuntimeError: Cannot send a request, as the client has been closed.?

Check whether this cause matches your environment: LiteLLM SDK v1.81.1 breaks OpenAI inference with 'RuntimeError: Cannot send a request, as the client has been closed.' Regression from previous working version. Affects production deployments using LiteLLM as OpenAI proxy.

Is the RuntimeError: Cannot send a request, as the client has been closed. guidance source-backed?

The "Fix LiteLLM OpenAI Inference Broken in SDK v1.81.1 — Client Closed Error" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for RuntimeError: Cannot send a request, as the client has been closed.?

For "Fix LiteLLM OpenAI Inference Broken in SDK v1.81.1 — Client Closed Error", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." 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 RuntimeError: Cannot send a request, as the client has been closed.?

For "Fix LiteLLM OpenAI Inference Broken in SDK v1.81.1 — Client Closed Error", 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.