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400 model provider error Claude Code plugin

Quick fix

Add the environment variables required by the current provider to VS Code’s claudeCode.environmentVariables setting so the plugin can read them.

Symptom

Section titled “Symptom”
Error output
Error: 400 模型提供方错误。
English translation

Error: 400 model provider error.

Cause

Section titled “Cause”

The issue report says that after the Claude Code VS Code plugin was upgraded to 2.1.156, the terminal CLI could still read the environment variables in ~/.claude/settings.json, but the VS Code plugin launched from the Dock returned 400. The reporter suspected that the newer plugin’s bundled Anthropic SDK reads ANTHROPIC_BASE_URL directly from process.env, while VS Code launched as a GUI has no such variables. Therefore, updating only ~/.claude/settings.json was insufficient. The maintainer said the issue was on the client or provider side and CC Switch could not fix it at the root cause.

Fix

Section titled “Fix”

  1. Manually add the environment variables used by the current provider to claudeCode.environmentVariables in VS Code. The issue gives the VS Code user settings file path as ~/Library/Application Support/Code/User/settings.json; the reporter said the plugin worked again after adding them.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code VS Code 插件
Version2.1.156（报告出现问题的插件版本）
PlatformsmacOS

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”
Why does the VS Code plugin return 400 when claude works in the terminal?
The issue report says the terminal CLI could read ~/.claude/settings.json, while the VS Code plugin launched from the Dock lacked the required environment variables. The reporter said the plugin worked again after adding those variables to claudeCode.environmentVariables.
Can CC Switch fix this issue at the root cause?
The maintainer said the issue was on the client or provider side and CC Switch could not fix it at the root cause.
Section titled “Related problems”
Provider API Key Overwritten: After Codex Restart or SwitchUpgrade to cc-switch v4.0.0 or later to prevent provider keys from overwriting each other and restore the official login state.6 issues mergedClaude Code no longer hot-reloads settings.json after switching providersRestart Claude Code after switching so it reads settings.json again; clash-for-ai can avoid this limitation.1 issues mergedsettings.json overwritten by cc-switchWrite non-env custom settings to “General Configuration” and select “Write General Configuration”; field-level merging is not planned.4 issues merged

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