Jurassic-2 Large Base
Jurassic-2 Large Base was one of the March 2023 text-completion models. It occupied the smallest tier in the original three-size base-model range.
Access not confirmed
How the later name differs
In June 2023, AI21 simplified the range to instruction-capable models. The Large size became Light.AI21 simplifies Jurassic-2 to Light, Mid and Ultra
Practical guidance. A historical Large Base reference should not be treated as proof of identical weights or behavior under the later Light name.
Current access is not established
Practical guidance. This page preserves the distinct original base release. No current public API or weight distribution has been confirmed for this checkpoint.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Access not confirmed |
| Launch date | |
| Model identifiers | J2-large |
| Release form | Base language modelJurassic-2 and task-specific API launch |
Related models
- 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-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