Jurassic-2 Light
Jurassic-2 Light was the smallest model after AI21 consolidated its range in June 2023. It targeted simple extraction, classification and short copy.
Access not confirmed
Small tasks were its main role
Practical guidance. A short output can still require exact behavior. For classification, define the permitted labels. For extraction, define what to return when a field is absent. These requirements matter more than a model's size label.
The completion API was superseded
AI21's historical migration notice deprecated Jurassic in Q3 2024. It moved completion tasks into Jamba's chat-style endpoint, where an explicit completion instruction replaces an unfinished prompt.AI21's historical Jurassic-to-Jamba migration notice
Practical guidance. Light is a historical entry here. Current access through AI21 or a partner is not confirmed.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Access not confirmed |
| Launch date | |
| Model identifiers | J2-Lightj2-light |
| Historical size name | LargeAI21 simplifies Jurassic-2 to Light, Mid and Ultra |
Related models
Compact dense language model for private document processing and instruction-based tasks.
Launch date Downloadable- 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