AI21 Labs' compact, open-weight model offering a massive 256k context window and high throughput at a very competitive price point.
Jamba 1.5 Mini is a compact, efficient, and open-weight language model developed by AI21 Labs. It represents a significant entry in the growing category of small, specialized models designed for speed and cost-effectiveness over raw reasoning power. Built on AI21's innovative Jamba architecture, which hybridizes traditional Transformer blocks with state-space model (SSM) components, it aims to deliver a unique balance of performance characteristics. This model is not intended to compete with flagship reasoning models like GPT-4 or Claude 3 Opus; instead, it carves out a niche for high-throughput, low-latency tasks where budget and responsiveness are paramount.
The standout feature of Jamba 1.5 Mini is its enormous 256,000-token context window, a size typically reserved for much larger, more expensive models. This capability, combined with its very low price point, creates compelling possibilities for applications that need to process or reference large volumes of text. Use cases like Retrieval-Augmented Generation (RAG) over extensive document sets, long-form conversation history management, and analysis of lengthy legal or financial reports become economically viable. The model's ability to 'see' and process this much information in a single pass is its primary value proposition.
However, this impressive context capacity comes with a significant trade-off: intelligence. On the Artificial Analysis Intelligence Index, Jamba 1.5 Mini scores a 4, placing it at the lower end of the spectrum (#29 out of 33 benchmarked models). This indicates that it is not well-suited for tasks requiring complex reasoning, multi-step problem-solving, or nuanced creative generation. Users should approach it as a specialized tool. It excels at tasks like data extraction, classification, formatting, and basic summarization, particularly when the input is well-structured. Attempting to use it for sophisticated analysis or creative writing will likely lead to disappointing results and may require more prompt engineering or retries, potentially negating some cost savings.
Currently available through major cloud providers like Google Vertex AI and Amazon Bedrock, Jamba 1.5 Mini offers developers a scalable, serverless option for integrating its capabilities. Performance benchmarks show a clear leader in speed, with Google Vertex delivering significantly higher output tokens per second and lower latency. With identical pricing across both platforms, the choice of provider hinges primarily on ecosystem preference and the need for maximum throughput. For developers building applications where speed is critical and the tasks are well-defined, Jamba 1.5 Mini presents a powerful and affordable building block.
4 (29 / 33)
81 tokens/s
$0.20 / 1M tokens
$0.40 / 1M tokens
N/A
0.40 s TTFT
| Spec | Details |
|---|---|
| Model Owner | AI21 Labs |
| Architecture | Jamba (Hybrid Transformer & SSM) |
| License | Apache 2.0 (Open Weight) |
| Context Window | 256,000 tokens |
| Knowledge Cutoff | March 2024 |
| Model Family | Jamba 1.5 |
| Intended Use | High-throughput classification, RAG, summarization, data extraction |
| API Providers | Google Vertex AI, Amazon Bedrock |
| Parameters | Not specified, categorized as a 'Mini' or small model |
Jamba 1.5 Mini is available on leading cloud AI platforms, but performance is not identical across the board. While both Amazon Bedrock and Google Vertex AI offer the same attractive pricing, their performance metrics for speed and latency differ significantly. Your choice of provider should be guided by your application's specific priorities, such as the need for raw speed versus deep integration within an existing cloud ecosystem.
| Priority | Pick | Why | Tradeoff to accept |
|---|---|---|---|
| Max Speed & Lowest Latency | Google Vertex | Vertex is the clear winner on performance, offering nearly 56% higher output speed (81 vs 52 t/s) and almost half the latency (0.40s vs 0.75s TTFT). | None. Pricing is identical to Amazon Bedrock, so there is no cost trade-off for the superior performance. |
| AWS Ecosystem Integration | Amazon Bedrock | For teams heavily invested in AWS, Bedrock provides seamless integration with services like S3, Lambda, IAM, and CloudWatch for unified management and billing. | A significant performance penalty. You will sacrifice substantial output speed and responsiveness compared to the Google Vertex offering. |
| Lowest Cost | Tie | Both Google Vertex and Amazon Bedrock offer identical pricing for Jamba 1.5 Mini: $0.20 per 1M input tokens and $0.40 per 1M output tokens. | Since cost is not a differentiator, the decision must be based on performance requirements or cloud platform preference. |
| Simplified Deployment | Tie | Both providers offer fully managed, serverless API endpoints. This abstracts away all infrastructure management, allowing developers to focus on the application logic. | N/A. Both options provide a similar level of operational ease. |
Performance metrics are based on benchmarks conducted by Artificial Analysis. Real-world performance may vary based on workload, region, and concurrent traffic. Prices are set by providers and are subject to change. Always verify current pricing with the provider.
To contextualize the cost of Jamba 1.5 Mini, let's examine a few practical scenarios. These examples use a blended price of $0.25 per million tokens (based on the $0.20 input and $0.40 output price, assuming a 3:1 input-to-output ratio for calculation simplicity) to illustrate how affordable the model is for token-heavy tasks.
| Scenario | Input | Output | What it represents | Estimated cost |
|---|---|---|---|---|
| Long Document Q&A | 150,000 tokens | 500 tokens | Feeding a large PDF or report into the context window to ask a specific question. | ~$0.037 |
| Batch Article Classification | 2,000,000 tokens (1000 articles @ 2k each) | 1,000 tokens (1000 single-word labels) | A high-volume, input-heavy data processing job. | ~$0.40 |
| Real-time Chatbot Session | 5,000 tokens | 1,500 tokens | A moderately long conversation with a user, including full history in context. | ~$0.0015 |
| Meeting Transcript Summarization | 25,000 tokens | 1,000 tokens | Condensing a one-hour meeting transcript into key bullet points and action items. | ~$0.0065 |
| Codebase Context for a Copilot | 200,000 tokens | 2,000 tokens | Loading a significant portion of a codebase to answer a development question. | ~$0.05 |
The takeaway is clear: Jamba 1.5 Mini makes processing vast amounts of text incredibly cheap. Costs for individual tasks are measured in fractions of a cent, making it a powerful engine for applications that need to be constantly aware of large contexts, such as RAG systems, chatbots, and document analysis tools, provided the task itself doesn't require deep reasoning.
While Jamba 1.5 Mini is already one of the most affordable models on the market, optimizing your implementation can further reduce costs and improve efficiency at scale. The following strategies are tailored to its unique profile of high speed, massive context, and low intelligence.
When pricing is identical, performance is the key differentiator. Choosing a faster provider like Google Vertex has direct cost implications:
The 256k context window is a powerful tool, not a default setting. Avoid waste by treating it as a budget.
Acknowledge Jamba 1.5 Mini's limitations to prevent wasted calls. A 'router' or 'cascade' system can dramatically improve quality and control costs.
For any task that doesn't require an immediate response, batching is your best friend. This applies to things like document classification, data extraction, or generating summaries for a list of articles.
Jamba 1.5 Mini is a small, open-weight language model from AI21 Labs. It is designed for efficiency, offering high-speed performance, a very large 256,000-token context window, and low operational costs. It is best used for tasks that do not require complex reasoning.
Jamba is a hybrid AI architecture that combines elements of traditional Transformer models with State-Space Models (SSMs), specifically Mamba. This design aims to leverage the strengths of both: the reasoning and world knowledge capabilities of Transformers and the efficiency and long-context handling of SSMs. The goal is to create models that are both powerful and highly efficient.
It excels at high-volume, token-intensive tasks where speed and cost are critical. Key use cases include:
The primary limitation is its low intelligence score. It struggles with tasks that require deep reasoning, multi-step problem-solving, advanced mathematics, or nuanced creative generation. It should be seen as a specialized tool for simpler language tasks, not a general-purpose reasoning engine.
Jamba 1.5 Mini competes in the same class of small, efficient open-weight models. Its key differentiator is the 256k context window, which is significantly larger than what most other models in this size class offer. While it may lag slightly behind some competitors on pure reasoning benchmarks, it wins on its ability to process vast amounts of context at high speed and low cost.
'Open weight' means that the model's parameters (the 'weights') are publicly released, in this case under an Apache 2.0 license. This allows developers and researchers to download, modify, and run the model on their own infrastructure, offering more freedom and control compared to closed models accessible only via a proprietary API. However, most users will access it via managed API providers like Google and Amazon for convenience and scalability.
A 256,000-token context window is massive. As a rough estimate, it's equivalent to approximately 190,000 words or about 400-500 pages of a standard book. This allows the model to hold the entirety of a very large technical manual, a quarterly earnings report with appendices, or a complete novel like 'The Great Gatsby' (which is about 50,000 words) multiple times over in a single prompt.