LiteLLM / LiteLLM

LiteLLM max_parallel_requests Counter Leaks When Claude Code Cancels Streaming Requests

Fix LiteLLM max_parallel_requests counter not decrementing on cancelled streams Includes evidence for LiteLLM troubleshooting demand.

Source-backed Last updated May 14, 2026 1 source Needs local verification

Category: LiteLLM
Error signature: max_parallel_requests Current limit: N, Remaining: 0
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 14, 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

max_parallel_requests Current limit: N, Remaining: 0 is a LiteLLM failure pattern reported for developers trying to fix litellm max_parallel_requests counter not decrementing on cancelled streams. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Detailed root cause analysis in issue. Claude Code sends 2 HTTP POSTs per turn (speculative + confirmation), cancels POST A when POST B starts. CancelledError skips the decrement path. Counter grows by 1 per turn. Workaround provided (try/finally with async_log_failure_event).

Common causes

LiteLLM's parallel request limiter has a counter leak when Claude Code's dual-POST pattern cancels mid-stream. Eventually all requests hit 429 Budget Exceeded. Affects production deployments using Claude Code through LiteLLM proxy.
Detailed root cause analysis in issue. Claude Code sends 2 HTTP POSTs per turn (speculative + confirmation), cancels POST A when POST B starts. CancelledError skips the decrement path. Counter grows by 1 per turn. Workaround provided (try/finally with async_log_failure_event).

Quick fixes

Confirm the exact error signature matches max_parallel_requests Current limit: N, Remaining: 0.
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 max_parallel_requests Current limit: N, Remaining: 0 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 max_parallel_requests Current limit: N, Remaining: 0 mean in LiteLLM?

max_parallel_requests Current limit: N, Remaining: 0 indicates the workflow described by "LiteLLM max_parallel_requests Counter Leaks When Claude Code Cancels Streaming Requests" failed in a LiteLLM context. Start by confirming the exact signature and the component that emitted it.

What should I check first for max_parallel_requests Current limit: N, Remaining: 0?

Check whether this cause matches your environment: LiteLLM's parallel request limiter has a counter leak when Claude Code's dual-POST pattern cancels mid-stream. Eventually all requests hit 429 Budget Exceeded. Affects production deployments using Claude Code through LiteLLM proxy.

Is the max_parallel_requests Current limit: N, Remaining: 0 guidance source-backed?

The "LiteLLM max_parallel_requests Counter Leaks When Claude Code Cancels Streaming Requests" 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 max_parallel_requests Current limit: N, Remaining: 0?

For "LiteLLM max_parallel_requests Counter Leaks When Claude Code Cancels Streaming Requests", 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 max_parallel_requests Current limit: N, Remaining: 0?

For "LiteLLM max_parallel_requests Counter Leaks When Claude Code Cancels Streaming Requests", 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.