LLMOpen weights

Jamba 1.5 Large

AI21 Labs

Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error

Specifications

Type: LLM
Access: Open weights
Released: August 22, 2024
License: jamba open model license
Parameters: 398000000000
Context window: 256,000 tokens
Knowledge cutoff: March 5, 2024
Output speed: 100 tok/s
Latency (TTFT): 0.3s
API pricing: $2.00 in · $8.00 out / 1M tokens

Capabilities

Function callingStructured output

Benchmarks

Reasoning

36.9

Coding

14.3

Math

GSM8K	87
MATH-500	60.6

General

MMLU	81.2
MMLU-Pro	53.5
Arena Hard	65.4
Humanity’s Last Exam	4

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