Pinecone 401: API key missing, invalid, or revoked

TL;DR: 401 Unauthenticated means the key is missing or invalid. Check the env var is set, the value is current, and the key was not revoked in the console. Print its presence (never its value). Check the console's key list.

The error

401 Unauthenticated: Your API key is missing or invalid.

The fix

1. Is PINECONE_API_KEY set in this process? Print its presence (never its value). Empty env is the most common cause in CI and containers.
2. Is the value current? If the key was rotated in the console, every deployment still holding the old value 401s at once.
3. Was it revoked? Check the console's key list. Revoked keys fail closed with no grace period.
4. Are you sending it at all? Direct REST calls need the Api-Key header; SDK clients set it from the constructor or env.

When to use this

• You are seeing this exact error message; match the block above, not just part of it.
• The failing call matches the scenario in the title: Pinecone 401.
• You want the fastest verified fix before digging through logs.

When not to use this

• Your error text differs from the block above; close cousins often have different causes.
• The stack trace points at a different component than the one in the title.
• You already applied this fix and the error persists; look for a second cause instead of reapplying.

Compatibility

• Not pinned to a specific version; follows current Pinecone behavior.

Pinecone's error-handling guide defines 401 as missing or invalid API key and states 4xx errors (except 429) should not be retried. Verified against live docs 2026-09-26.