AI Coding Roundup — September 18, 2026: Claude Code Patches a Proxy Regression Hours After 2.1.275's Feature Drop
Two Claude Code releases landed within about 24 hours this week, and GitHub Copilot made a billing safeguard generally available for teams. Here's what actually shipped, straight from the official changelogs — plus what's still quiet at OpenCode and OpenAI's Codex CLI.
Claude Code 2.1.276: A Same-Day Fix for Proxy Users
Anthropic pushed Claude Code 2.1.276 on September 18, hours after 2.1.275 introduced a regression for anyone routing requests through a custom gateway. If your setup points ANTHROPIC_BASE_URL at a proxy or LLM gateway, 2.1.275 broke every request with a 400 error referencing an internal advisor tag. The fix landed in the same-day patch — full details in the official Claude Code changelog.
- What broke: 2.1.275 made every gateway-routed request fail with a 400 error referencing an internal advisor tag.
- What's fixed: 2.1.276 resolves the regression for anyone using ANTHROPIC_BASE_URL with a proxy or gateway.
- Why it matters: teams running self-hosted LLM gateways in front of Claude Code should update immediately to restore service.
Claude Code 2.1.275: Session Sync, a Send-Now Key, and Marketplace-Aware Installs
Before the hotfix, 2.1.275 (released September 17) was one of the meatier releases of the month, bundling several workflow upgrades:
- Gateway sign-in confirmation: when a gateway names the signed-in account, Claude Code now asks you to confirm it before saving the credential, and /status displays it.
- Send-now key: ctrl+enter (or ctrl+x ctrl+s) interrupts the current turn and sends every queued message at once; queued and sent messages show in gray until the model receives them.
- OpenTelemetry startup warning: sessions now surface an immediate warning if a configured otelHeadersHelper fails, instead of silently exporting no telemetry.
- claude.ai skill and plugin sync: skills and plugins enabled on your claude.ai account now sync to terminal sessions signed in with that account (opt out with syncClaudeAiSkills: false or syncClaudeAiPlugins: false).
- Marketplace-aware installs: /plugin install <plugin> --marketplace <source> now offers to add the marketplace automatically if it isn't configured yet.
GitHub Copilot: Budget Increase Requests Reach General Availability
On September 16, GitHub's Copilot budget increase request flow went generally available for Business and Enterprise plans on usage-based billing. Previously, once a member burned through their allotted AI credits, they were simply locked out of Copilot features until an admin manually raised their budget. Now the block itself surfaces a request path: the member asks for more from inside the blocked flow, and an org owner, enterprise owner, or billing manager can approve, adjust, or deny it directly under "Requests from members" — restoring access the moment it's approved.
A Quiet Week for OpenCode and Codex CLI
Not every tool shipped fresh notes this cycle. OpenCode's latest tagged release is still v1.18.31 from September 14 — mostly ACP session-state fixes and a Copilot-model reasoning tweak — and OpenAI's Codex CLI hasn't moved past v0.154.0 from September 10. Nothing new to install from either project yet, which makes this a good window to let the last stable build bed in before the next drop.
What This Means for Developers
The pattern this week is small but telling. Anthropic shipped a same-day hotfix rather than let a gateway regression sit through a weekend, which is worth noting if you manage Claude Code behind a corporate proxy — update to 2.1.276 now, and test gateway configs before rolling future updates out fleet-wide. GitHub, meanwhile, is quietly removing friction from its usage-based billing model: if you're a Copilot admin fielding "I'm blocked" tickets, the new budget-request flow should cut that noise significantly.
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