LLM Perks

Jamba 1.5 Large

AI21 Labs · All Jamba models
Free right now Frontier
Open weights

Jamba 1.5 Large is a language model with 398B parameters from AI21 Labs. It is currently free at 1 provider with up to — tokens of context. Its weights are open, so it can also run locally.

Developer
AI21 Labs
Parameters
398B / 94B active
Type
Text
License
Open weights

Where to use Jamba 1.5 Large for free

Each row is a separate free endpoint with its own limits.

ProviderContextLimitCard
NVIDIA Build
ai21labs/jamba-1.5-large-instruct
— Free serverless inference for development; limits and model availability may change. No Open

Quick start

curl https://integrate.api.nvidia.com/v1/chat/completions \
  -H "Authorization: Bearer $NVIDIA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "ai21labs/jamba-1.5-large-instruct",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Example for NVIDIA Build. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.

Benchmarks

Intelligence Index
6.0
GPQA Diamond
42.7%
Humanity's Last Exam
4.1%

Source: Artificial Analysis · Jamba 1.5 Large

FAQ

Is Jamba 1.5 Large free?

Yes. As of September 26, 2026, Jamba 1.5 Large is free at NVIDIA Build. Each provider has its own limits — see the table above.

How do I call Jamba 1.5 Large via API?

Use any OpenAI-compatible client with base URL https://integrate.api.nvidia.com/v1, model ID ai21labs/jamba-1.5-large-instruct, and a NVIDIA Build key.

How good is Jamba 1.5 Large?

Artificial Analysis Intelligence Index: 6.0, GPQA Diamond: 43%. For comparison, the strongest free model in the catalog right now is GLM 5.3.

Is Jamba 1.5 Large open-weight?

Yes, the weights are published — you can download and run it locally, for example with Ollama or LM Studio.