Claude Code / AI Coding Tools
Claude Code v2.1.142 massively degraded tokens per context and inference performance
Fix Claude Code version 2.1.142 performance regression where token throughput and inference speed are significantly degraded Includes evidence for Claude Code troubleshooting demand.
- Category
- AI Coding Tools
- Error signature
Claude Code v2.1.142 performance degradation — tokens per context, memory recovery, inference all degraded- Quick fix
- Compare the failing environment with a known working setup, then change one configuration value at a time.
- Updated
What this error means
Claude Code v2.1.142 performance degradation — tokens per context, memory recovery, inference all degraded is a Claude Code failure pattern reported for developers trying to fix claude code version 2.1.142 performance regression where token throughput and inference speed are significantly degraded. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.
Why this happens
GitHub issue #59574 filed 2026-05-16, labeled bug+platform:windows+area:model. Users report major performance degradation after upgrading to v2.1.142. Category mapped to AI Coding Tools per Claude Code -> AI Coding Tools rule.
Common causes
- GitHub issue #59574 filed 2026-05-16, labeled bug+platform:windows+area:model. Users report major performance degradation after upgrading to v2.1.142. Category mapped to AI Coding Tools per Claude Code -> AI Coding Tools rule.
Quick fixes
- Confirm the exact error signature matches
Claude Code v2.1.142 performance degradation — tokens per context, memory recovery, inference all degraded. - Check the Claude Code 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.
Sources checked
Evidence note: GitHub issue #59574 filed 2026-05-16, labeled bug+platform:windows+area:model. Users report major performance degradation after upgrading to v2.1.142. Category mapped to AI Coding Tools per Claude Code -> AI Coding Tools rule.
Related errors
- AI Coding Tools
FAQ
What should I check first?
Start with the exact Claude Code v2.1.142 performance degradation — tokens per context, memory recovery, inference all degraded text and the smallest action that reproduces it.
Can I ignore this error?
No. Treat it as a failed Claude Code workflow until the root cause is understood.
Is this guaranteed to have one fix?
No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.
How do I know the fix worked?
Rerun the same command, editor action, or request. The fix is working when that action completes without Claude Code v2.1.142 performance degradation — tokens per context, memory recovery, inference all degraded.