How much does Jamba 1.5 Large cost per million tokens?

Jamba 1.5 Large is priced at $2.00 / 1M tokens for input tokens and $8.00 / 1M tokens for output tokens via the official AI21 API at the time of writing.

What is Jamba 1.5 Large's context window?

Jamba 1.5 Large supports a context window of 256K tokens.

Is Jamba 1.5 Large open source?

Jamba 1.5 Large ships with open weights under the Jamba Open Model License license. You can self-host it, fine-tune it, and (subject to the license terms) deploy it commercially.

When was Jamba 1.5 Large released?

Jamba 1.5 Large was released on Aug 22, 2024 by AI21.

How much does Jamba 1.5 Large cost per million tokens?

Jamba 1.5 Large is priced at $2.00 / 1M tokens for input tokens and $8.00 / 1M tokens for output tokens via the official AI21 API at the time of writing.

What is Jamba 1.5 Large's context window?

Jamba 1.5 Large supports a context window of 256K tokens.

Is Jamba 1.5 Large open source?

Jamba 1.5 Large ships with open weights under the Jamba Open Model License license. You can self-host it, fine-tune it, and (subject to the license terms) deploy it commercially.

When was Jamba 1.5 Large released?

Jamba 1.5 Large was released on Aug 22, 2024 by AI21.

Open weightsAI21midtext

Jamba 1.5 Large

AI21's hybrid SSM-Transformer with a 256k context window, strong on long-doc tasks.

UpdatedApr 30, 2026

Quick facts

Released: Aug 2024
Context: 256K tokens
Output / 1M: $8.00 / 1M tokens
License: Jamba Open Model License

About Jamba 1.5 Large

Jamba 1.5 is AI21's hybrid Mamba-Transformer architecture, optimized for long-context efficiency. The 256k context window plus strong throughput make it a niche-but-strong choice for document-heavy enterprise pipelines.

Benchmarks

Published scores from AI21's model card or independent leaderboards. We do not publish numbers we cannot source, see methodology.

HumanEval

Python coding pass@1

MMLU

Broad academic knowledge

GPQA

Graduate-level reasoning

SWE-bench

Real software-engineering tasks

Benchmark scores not yet available. We only publish numbers we can source from official model cards or independent leaderboards, see methodology.

Capabilities

Strengths

256k context
Efficient long-context inference
Open weights

Tracked weaknesses

Smaller community than Llama / Qwen

Pricing

Per-million-token rates as published by AI21.

Tier	Price	Notes
Input	$2.00 / 1M tokens	Tokens you send to the model
Output	$8.00 / 1M tokens	Tokens the model generates
Context	256K tokens	Max combined input + output

Call Jamba 1.5 Large from your code

Drop-in snippet for the AI21 SDK. Set your API key in the environment and run.

typescript

import OpenAI from "openai";

const client = new OpenAI({
  // Use OPENAI_API_KEY for OpenAI, or your provider's key + baseURL.
  apiKey: process.env.OPENAI_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "jamba-1-5-large",
  messages: [
    { role: "user", content: "What's the time complexity of quicksort?" },
  ],
});

console.log(completion.choices[0].message.content);

Compare Jamba 1.5 Large with…

Frequently asked

How much does Jamba 1.5 Large cost per million tokens?
Jamba 1.5 Large is priced at $2.00 / 1M tokens for input tokens and $8.00 / 1M tokens for output tokens via the official AI21 API at the time of writing.
What is Jamba 1.5 Large's context window?
Jamba 1.5 Large supports a context window of 256K tokens.
Is Jamba 1.5 Large open source?
Jamba 1.5 Large ships with open weights under the Jamba Open Model License license. You can self-host it, fine-tune it, and (subject to the license terms) deploy it commercially.
When was Jamba 1.5 Large released?
Jamba 1.5 Large was released on Aug 22, 2024 by AI21.

Friday digest

One short email every Friday, new model launches, leaderboard moves, and pricing drops. Curated by hand. Free, no spam.