AI21 Python SDK
JSON →Official Python SDK for AI21 Labs API. Provides access to Jamba models (chat completions, streaming) and legacy J2 Jurassic models (completions). Current version: 4.3.0 (Mar 2026). SDK has two distinct API surfaces — modern Jamba chat completions API and legacy J2/Jurassic API — with different ChatMessage signatures. Jamba models are current; J2 models are legacy.
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API endpoints
full doc /v1/registry/ai21
install /v1/registry/ai21/install
compatibility /v1/registry/ai21/compatibility