CATCH #1443
DETECTED SEP 18, 2026 02:31 UTC
THE CATCHscore 5/10
EXHIBIT 1443
Sep 18, 2026 02:31 UTC
github_releases+pages
anthropics/claude-code
Anthropic's claude-code released v2.1.276, fixing a regression where requests failed with a '400 Input tag 'advisor_20260301'' error when using a proxy or gateway.
READY TO POST:
anthropic's claude-code just dropped v2.1.276, fixing a frustrating 400 error when using proxies. good to see them squashing those bugs!
if you've been having issues with claude-code and proxies, the new v2.1.276 release might be your fix. looks like they addressed a regression causing 400 errors.
EVIDENCE — the receipts
[MERGED across 2 sources: github_releases, pages]
shared signal: claude-code
--- github_releases :: anthropics/claude-code ---
anthropics/claude-code release: v2.1.276
name: v2.1.276
published: 2026-09-18T02:12:26Z
url: https://github.com/anthropics/claude-code/releases/tag/v2.1.276
## What's changed
- Fixed every request failing with `400 … Input tag 'advisor_20260301'` when `ANTHROPIC_BASE_URL` points at a proxy or gateway (2.1.275 regression)
--- pages :: https://raw.githubusercontent.com/anthropics/claude-code/main/CHANGELOG.md ---
Claude Code changelog changed: https://raw.githubusercontent.com/anthropics/claude-code/main/CHANGELOG.md
2 added lines
---
+++
@@ -1,2 +1,4 @@
# Changelog
+## 2.1.276
+- Fixed every request failing with `400 … Input tag 'advisor_20260301'` when `ANTHROPIC_BASE_URL` points at a proxy or gateway (2.1.275 regression)
## 2.1.275
caught by the 20-minute sweep ·
the live wire · all receipts