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ANTHROPIC_DEFAULT_SONNET_MODEL not taking effect: Claude Code

Quick fix

In CC Switch local proxy mode, set the target model in ANTHROPIC_DEFAULT_SONNET_MODEL; the proxy maps this field, not *_MODEL_NAME.

Symptom

Section titled “Symptom”
Error output
"ANTHROPIC_DEFAULT_SONNET_MODEL": "claude-sonnet-4-6"

Cause

Section titled “Cause”

The CC Switch proxy reads `ANTHROPIC_DEFAULT_SONNET_MODEL` and other `*_MODEL` fields for model mapping. It does not read the corresponding `*_MODEL_NAME` fields. The name shown in the interface may be `DeepSeek-V4-Flash`, while the actual request model written to the configuration may still be `claude-sonnet-4-6`, so the proxy forwards the latter. In issue #3565, a user reported accurate mapping after opening the CC Switch terminal; the maintainer later explained that the interface and configuration-writing behavior had changed significantly in v4.0, then closed the issue.

Fix

Section titled “Fix”

  1. Check the `ANTHROPIC_DEFAULT_SONNET_MODEL` value for the corresponding model in `~/.claude/settings.json`; the local proxy maps this field.

  2. Write the target model ID to `ANTHROPIC_DEFAULT_SONNET_MODEL`; do not only change `ANTHROPIC_DEFAULT_SONNET_MODEL_NAME`.

  3. If the problem persists after using CC Switch v4.0, follow the maintainer's suggestion to report it again with the version and reproduction steps.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code
Versioncc-switch 3.15.0（受影响版本；维护者称 v4.0 的界面与配置写入方式已有较大变化）
PlatformsLinux

Source Issues

Section titled “Source Issues”

This page is distilled from 2 real issues

FAQ

Section titled “FAQ”
Why is the model in `ANTHROPIC_DEFAULT_SONNET_MODEL_NAME` a DeepSeek model, while proxy requests still use a Claude model?
The proxy maps using `ANTHROPIC_DEFAULT_SONNET_MODEL` and does not read the `_NAME` field. Check and set the field for the actual request model.
What should I do if the problem persists after upgrading to v4.0?
The maintainer recommends reporting it again with the version and reproduction steps.
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 mergedBoth ANTHROPIC_AUTH_TOKEN and ANTHROPIC_API_KEY setSwitching from DeepSeek or MiMo to Codex writes both authentication variables at once; this issue has no confirmed Codex fix.1 issues mergedCache 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 merged

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