What this error means

Anthropic NotFoundError (404) on Batch API - server-side propagation delay is a Anthropic API failure pattern reported for developers trying to fix anthropic batch api returning 404 not found intermittently after successfully creating a batch. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Filed 2026-04-21. Batch created successfully, then retrieve/results returns 404 intermittently. Server-side propagation delay. Affects batch processing pipelines using paid Anthropic API.

Common causes

  • After successfully creating a message batch via the Anthropic API, subsequent calls to batches.retrieve() or batches.results() intermittently return 404. This is a server-side propagation delay issue that causes production batch processing pipelines to fail.
  • Filed 2026-04-21. Batch created successfully, then retrieve/results returns 404 intermittently. Server-side propagation delay. Affects batch processing pipelines using paid Anthropic API.

Quick fixes

  1. Confirm the exact error signature matches Anthropic NotFoundError (404) on Batch API - server-side propagation delay.
  2. Check the Anthropic API account, local tool state, and provider configuration involved in the failing workflow.
  3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

  • Verify the command, editor, extension, or API client that produced the error.
  • Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
  • Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

  1. Capture the exact error message and the command, editor action, or request that triggered it.
  2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
  3. Review the source evidence below and compare it with your environment.
  4. Apply one change at a time and rerun the smallest failing action.
  5. Keep the working fix documented for the team or deployment environment.

How to prevent it

  • Keep provider/tool configuration documented.
  • Record non-secret diagnostics such as tool version, provider name, model name, and command path.
  • Add a lightweight check before CI or production workflows depend on the tool.