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Unsupported content type: redacted_thinking - Claude Code

Quick fix

Run a local proxy such as openrouter-proxy to filter out redacted_thinking blocks, and point the Claude Code config at that proxy.

Symptom

Section titled “Symptom”
Error output
Unsupported content type: redacted_thinking

Cause

Section titled “Cause”

When cc-switch or OpenRouter routes Claude Code requests to a non-native-Anthropic model (OpenAI GPT, Codex), the streaming response from upstream contains redacted_thinking content blocks.

The Claude Code client — the VS Code extension especially — cannot recognise that non-standard internal reasoning block, so it throws an unsupported type error and the output stops. The cc-switch mainline does not yet include logic to filter that field.

Fix

Section titled “Fix”

  1. Download and run a third-party proxy tool such as openrouter-proxy, which intercepts and filters out the incompatible redacted_thinking blocks automatically.

  2. Edit the Claude Code config file and change the API request address from the original one to the local proxy address.

    // C:\Users\<your_username>\.claude\settings.json
     https://openrouter.ai
     http://127.0.0.1:8899

Affected Versions

Section titled “Affected Versions”
ToolClaude Code
Version2.1.209 - 2.1.218
PlatformsWindowsmacOS

Source Issues

Section titled “Source Issues”

This page is distilled from 4 real issues

FAQ

Section titled “FAQ”
The Claude Code extension cannot reach the target after installing and running openrouter-proxy. What now?
Check you changed the URL in C:\Users\<your_username>\.claude\settings.json correctly — it has to go from https://openrouter.ai to the local proxy address http://127.0.0.1:8899.
Will cc-switch integrate this fix as an optional switch?
The community has submitted a pull request to integrate the filtering into cc-switch, but until it is merged officially and released, a third-party proxy tool is still needed.
Section titled “Related problems”
settings.json overwritten by proxy takeover causing plugin config loss - Claude CodePlace custom fields such as hooks and statusLine into the "General Configuration" panel, or upgrade to v3.12.2+ to fix the legacy backup restore logic.15 issues mergedunexpected status 404 Not FoundUpgrade cc-switch to v3.16.4+ and set the upstream format explicitly to Chat Completions on the Codex provider form.4 issues mergedChatGPT will not authenticate even with the global proxy on - cc-switchUpgrade cc-switch to v3.16.4+ and set the proxy address under Settings > Routing > Global outbound proxy, fixing OAuth not going through the proxy.5 issues merged

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