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Both ANTHROPIC_AUTH_TOKEN and ANTHROPIC_API_KEY set · Claude Code

Quick fix

Switching from DeepSeek or MiMo to Codex writes both authentication variables at once; this issue has no confirmed Codex fix.

Symptom

Section titled “Symptom”
Error output
Both ANTHROPIC_AUTH_TOKEN and ANTHROPIC_API_KEY set · auth may not work as expected

Cause

Section titled “Cause”

In a Windows report on CC Switch 3.16.5, after switching from DeepSeek or MiMo to Codex, both `ANTHROPIC_API_KEY` and `ANTHROPIC_AUTH_TOKEN` appear in `~/.claude/settings.json`. Claude Code therefore shows the dual authentication environment variable warning.

The same report states that after switching back from Codex to DeepSeek or MiMo, only `ANTHROPIC_AUTH_TOKEN` remains in the file, and Claude Code runs normally. The reporter did not configure any extra environment variables; the issue contains no maintainer-confirmed root cause or Codex-specific fix.

Fix

Section titled “Fix”

  1. To temporarily restore a configuration that uses only `ANTHROPIC_AUTH_TOKEN`, switch back from Codex to DeepSeek or MiMo; the report describes Claude Code as running normally in this state.

  2. If you must use Codex, the current issue offers no confirmed workaround; keep your reproduction steps and the authentication fields in `~/.claude/settings.json` for follow-up.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code
Version3.16.5（reported affected）
PlatformsWindows

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”
I ran into this problem too. Is there a temporary workaround?
The thread has no confirmed Codex workaround. The report only states that after switching back to DeepSeek or MiMo, `~/.claude/settings.json` keeps only `ANTHROPIC_AUTH_TOKEN`, and Claude Code runs normally.
Even with this problem, I can still chat in the terminal. It is unclear what impact this has.
The thread records feedback that terminal chat still works, but it only explicitly shows the Claude Code dual authentication variable warning; no further impact is described.
Section titled “Related problems”
Cache hit rate only 40% and extremely slow - Claude CodeDisable the dynamic attribution header in `.claude/settings.json`; if that fails, switch to a model with working caching and monitor the main issue.2 issues mergedProvider 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 mergeddeepseek接入 模型勾选了1m: no 1M context option in Claude Code model pickerUpgrade cc-switch to v3.17.0+, leave the DeepSeek provider's ANTHROPIC_MODEL empty or check 1M there too, fill only Haiku/Sonnet/Opus mappings… (Claude Code)7 issues merged

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