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API Error 529 (overloaded_error)

Anthropic capacity saturation: the model is temporarily overloaded.

254 issues · 27 open · 227 resolved (89%) · first seen Mar 4, 2025

First response · service

What to do now

Most likely: Anthropic capacity is temporarily saturated; this is usually server-side.

  1. Wait briefly and retry with exponential backoff instead of sending parallel retries.
  2. Check the official Claude status page and whether other users filed fresh 529 reports.
  3. Do not rotate API keys or rewrite project configuration for an isolated 529.

These are conservative triage steps, not an official Anthropic fix. Use the issue and workaround evidence below before making a destructive configuration change.

Is this getting better or worse?

This class of problem is holding steady. 74 new reports in the last 90 days vs 88 in the 90 before — -16%. The open backlog peaked at 53 in 2026-07 and sits at 27 today.

0 13 27 40 53 2025-032025-092026-032026-08
2025-03 — First reports2025-07 — Most new reports (52)2026-07 — Peak backlog (53 open)

Derived by counting each matching issue from its creation date until it closed. First-party computation over the anthropics/claude-code tracker — the trend is not published anywhere upstream.

Which builds report this

148 of these reports name the Claude Code build they were running, spanning 61 releases. Heaviest reporters:

Report volume, not a defect count: an issue can mention a build without that build having caused the failure. Versions come from the version string in the bug-report template, matched against real published tags.

Do these get fixed?

Median time to close is 16 days across 227 closures. Of the 227 closures with a recorded reason, 24% were closed as completed and 172 as not-planned or duplicate. The most recent completed fix landed in 2026-08.

Workarounds reported by the community

13 of these issues post a workaround someone says worked. The highest-engagement ones:

Anthropic API Overloaded Error with Repeated 529 Status Codes
try switching to Haiku with as a workaround.
Found in the thread of #3572 · resolved
API Request Failures: Persistent 529 Overloaded Errors
…e error is just on chat sessions with really large context. In the meantime adding relevant context to the .md file and continuing in a new chat should suffice.
Found in the thread of #2919 · resolved
Anthropic API Overloaded Error (529)
…to know if there’s an ETA for resolution or any recommended workaround in the meantime.
Found in the thread of #3555 · resolved
HTTP 529 Overloaded errors occurring frequently on Max plan with Claude Opus 4.6
…y access should buffer against server capacity constraints. Workaround Attempted - Retry on error (transient fix) - Reduce parallel sessions (helps slightly) - is only available in mode, not interactive sessions — a sett…
Found in the description of #39767 · still open
[BUG] API Error: Overloaded no longer automatically retrying
Workaround: I successfully downgraded to 0.2.55 with that and automatic API retries are working again on the newly downgraded session as well.
Found in the thread of #661 · resolved

Excerpts are quoted from the linked issue so you can judge relevance before opening it. Threads that only ask for a workaround, or report that there is none, are excluded. These are community suggestions, not official guidance from Anthropic — read the full thread before applying one.

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