AI21 Labs
AI21 Labs develops language models and trains specialized AI for business tasks. Its own model lines include Jurassic and Jamba, whose hybrid architecture combines attention with state-space processing.
Models & tools
Compact dense language model for private document processing and instruction-based tasks.
Launch date Downloadable- Jamba2 Mini
AI21 Labs · Jamba2
Hybrid language model with 12 billion active parameters for document questions, extraction and structured text.
Launch date API · Downloadable - Jamba Reasoning 3B
AI21 Labs · Jamba
Small hybrid reasoning model trained for code, mathematics and structured answers.
Launch date Downloadable - Jamba Large 1.7
AI21 Labs · Jamba
Large hybrid mixture-of-experts model focused on answers grounded in supplied documents.
Launch date API · Downloadable - Jamba Mini 1.7
AI21 Labs · Jamba
Earlier Mini release with improved source-grounded answers and instruction following.
Launch date Deprecated API; check access detailsDownloadable - Jamba 1.5a
AI21 Labs · Jamba research
AI21 and Enkrypt AI's alignment study based on Jamba Mini 1.5.
Launch date Access not confirmed - Jamba Large 1.6
AI21 Labs · Jamba
398-billion-parameter Jamba release for long-document extraction and enterprise text tasks.
Launch date Deprecated API; check access detailsDownloadable - Jamba Mini 1.6
AI21 Labs · Jamba
March 2025 Mini model for classification, document questions and structured generation.
Launch date Deprecated API; check access detailsDownloadable - Jamba Tiny Dev
AI21 Labs · Jamba research
319-million-parameter trained development checkpoint for work on the Jamba architecture.
Launch date Research releaseDownloadable - Jamba Large 1.5
AI21 Labs · Jamba
First Large Jamba checkpoint, scaling the hybrid design to 398 billion total parameters.
Launch date Deprecated API; check access detailsDownloadable · API - Jamba Mini 1.5
AI21 Labs · Jamba
Original instruction-tuned Mini model with tool calls, JSON output and long text input.
Launch date Deprecated API; check access detailsDownloadable · API - Jamba-Instruct
AI21 Labs · Jamba
Historical hosted instruction version of the original Jamba architecture.
Launch date Access not confirmed - Jamba v0.1
AI21 Labs · Jamba
Original pretrained hybrid Mamba-Transformer checkpoint for model training and adaptation.
Launch date Downloadable - Contextual Answers
AI21 Labs · Task-specific models
Specialized question-answering model trained to use supplied evidence and identify missing answers.
Launch date Access not confirmed - Jurassic-2 Light
AI21 Labs · Jurassic-2
Small instruction-capable Jurassic-2 model for classification, extraction and short text.
Launch date Access not confirmed - Jurassic-2 Grande Base
AI21 Labs · Jurassic-2
Historical middle Jurassic-2 base model from the March 2023 release.
Launch date Access not confirmed - Jurassic-2 Jumbo Base
AI21 Labs · Jurassic-2
Historical largest Jurassic-2 base model from the March 2023 release.
Launch date Access not confirmed - Jurassic-2 Large Base
AI21 Labs · Jurassic-2
Historical smallest Jurassic-2 base model from the March 2023 release.
Launch date Access not confirmed - Jurassic-2 Mid
AI21 Labs · Jurassic-2
Middle Jurassic-2 tier for text generation, summaries and information extraction.
Launch date Access not confirmed - Jurassic-2 Ultra
AI21 Labs · Jurassic-2
Largest instruction-capable Jurassic-2 tier for complex text comprehension and generation.
Launch date Access not confirmed - Jurassic-1 Grande
AI21 Labs · Jurassic-1
Middle-sized Jurassic-1 text model introduced between Large and Jumbo.
Launch date Access not confirmed - Jurassic-1 Jumbo
AI21 Labs · Jurassic-1
178-billion-parameter Jurassic-1 model with a wider, shallower Transformer design.
Launch date August 2021Access not confirmed - Jurassic-1 Large
AI21 Labs · Jurassic-1
Historical 7.5-billion-parameter English text model with a large phrase-aware vocabulary.
Launch date August 2021Access not confirmed