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Unsupported parameter(s): prompt_cache_key - Claude Code

Quick fix

Upgrade cc-switch to the latest version, fixing prompt_cache_key not being stripped automatically when forwarding to the Nvidia API.

Symptom

Section titled “Symptom”
Error output
API Error: 400 Validation: Unsupported parameter(s): prompt_cache_key

Cause

Section titled “Cause”

When cc-switch forwards Claude Code requests to the Nvidia API (models such as glm4.7 and kimi-k2.5), the Nvidia OpenAI-compatible endpoint does not support the prompt_cache_key parameter, producing an HTTP 400. In cc-switch 3.13.0, the rectifier did not filter that parameter automatically.

Fix

Section titled “Fix”

  1. Upgrade cc-switch past 3.13.0. Later versions fixed removing prompt_cache_key automatically when forwarding over the OpenAI protocol.

  2. If you cannot upgrade yet, avoid the cc-switch "open terminal" button. With the local proxy on, launch Claude Code from a system terminal (PowerShell or Cmd) instead.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code
VersionUnknown
PlatformsmacOSWindows

Source Issues

Section titled “Source Issues”

This page is distilled from 3 real issues

FAQ

Section titled “FAQ”
Why do kimi or glm models on the Nvidia API produce this error?
Because the Nvidia API endpoint does not support the prompt_cache_key parameter, and cc-switch 3.13.0 and earlier did not filter it out when forwarding the request.
Is there a workaround before the fixed version ships?
Users report that avoiding the cc-switch "open terminal" button and opening Claude Code through PowerShell or Cmd with the local proxy on works around it.
Section titled “Related problems”
Nvidia check failed: Not found (404)Upgrade cc-switch to v3.16.3+; new version uses lightweight HTTP probing, fixing NVIDIA interface false 404 errors.2 issues mergedBash(...) Waiting... Claude CodeDowngrade Claude Code to v2.1.104 or v2.0.64 (admin required), or switch to a compatible provider such as Alibaba Cloud Bailian.1 issues mergedUpstream HTTP 404 cc-switchUpgrade cc-switch to remove ?beta=true from NVIDIA requests. Kimi does not support Codex's Responses API; use Claude Code or a local adapter.2 issues merged

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