Cohere Common Errors

Overview

Quick reference for real Cohere API v2 errors with exact messages, causes, and fixes.

Prerequisites

• cohere-ai SDK installed
• CO_API_KEY configured
• Access to error logs

Error Reference

400 — Bad Request: Missing Required Field

CohereError: model is required

Cause: API v2 requires model for all endpoints (Chat, Embed, Rerank, Classify).