Language model

Jamba Large

ai21

Released: July 1, 2025
Data date: September 24, 2026

Profile

Specifications and access

Published information about this model. Existing estimates are explicitly labeled.

Specification	Value and source
Weights	Open weightsSource
Access	APISource
Parameters	398 billionSource
Active parameters	94 billionSource
Context window	256,000 tokensSource
Maximum output	4,096 tokensSource
Knowledge Cutoff	August 2024Source
Inputs	TextSource
Outputs	TextSource
Tool calling	YesSource

Evidence

Sources and data date

Every statement links to its underlying documentation or leaderboard.

Type	Evidence and data date
Additional source	models.dev catalog (retrieved September 24, 2026)
Additional source	Hugging Face