Jurassic-2 Models by AI21 Labs
Last refreshed 2026-05-22. Next refresh: weekly.
Details
Capabilities
Links
WebsiteAbout
Jurassic-2 (J2), developed by AI21 Labs and launched in March 2023, represents a cutting-edge family of large language models (LLMs) tailored for text completion and conversational scenarios. Initially, the J2 family featured three primary models—Large, Grande, and Jumbo—before simplifying to Ultra, Mid, and Light, based on size and capabilities. Known for their superior zero-shot instruction-following, reduced latency, and support for multiple languages, these models were trained on an extensive dataset comprising internet text, leading to over 60 billion parameters in their most advanced version. Despite their smaller parameter count, J2 models have demonstrated impressive performance on numerous benchmarks. AI21 Labs made these models available through the AI21 Studio platform, offering APIs for tasks such as paraphrasing and summarization. However, it's important to note that the Jurassic-2 models are no longer available as of November 14, 2024.
Decision facts
- Best fit
- structured outputschatbot and role-playing use cases
- Capability starting point
- AI21 Labs J2-Ultra with 8k context and structured outputs
- Lowest tracked input
- Jurassic-2 Light · $3/1M · AI21 Studio
- Closest related family
- Jamba 1.7
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
Use when the workload needs 8k context, 60B parameters, and structured outputs.
Use when the workload needs 8k context, 17B parameters, and structured outputs.
Use when the workload needs 8k context and 7B parameters.
Use when the workload needs 8k context and 60B parameters.
Use when the workload needs 8k context, 178B parameters, and structured outputs.
Use when the workload needs 8k context, 17B parameters, and structured outputs.
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| Jurassic-2 Ultra | Use when the workload needs 8k context, 60B parameters, and structured outputs. | 2023-03 | 8k context60B parametersstructured outputs | Current |
| Jurassic-2 Mid | Use when the workload needs 8k context, 17B parameters, and structured outputs. | 2023-03 | 8k context17B parametersstructured outputs | Current |
| Jurassic-2 Light | Use when the workload needs 8k context and 7B parameters. | 2023-03 | 8k context7B parameters | Current |
| Jurassic-2 Chat | Use when the workload needs 8k context and 60B parameters. | 2023-03 | 8k context60B parameters | Current |
| AI21 Labs J2-Ultra | Use when the workload needs 8k context, 178B parameters, and structured outputs. | 2021-08 | 8k context178B parametersstructured outputs | Current |
| AI21 Labs J2-Mid | Use when the workload needs 8k context, 17B parameters, and structured outputs. | 2021-08 | 8k context17B parametersstructured outputs | Current |
Release Timeline
2 release groupsSpecifications(6 models)
| Model | Released | Context | Parameters | Structured Outputs |
|---|---|---|---|---|
| Jurassic-2 Ultra | 2023-03 | 8k | 60B | Yes |
| Jurassic-2 Mid | 2023-03 | 8k | 17B | Yes |
| Jurassic-2 Light | 2023-03 | 8k | 7B | No |
| Jurassic-2 Chat | 2023-03 | 8k | 60B | No |
| AI21 Labs J2-Ultra | 2021-08 | 8k | 178B | Yes |
| AI21 Labs J2-Mid | 2021-08 | 8k | 17B | Yes |
Available From(2 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| Jurassic-2 Light | AI21 Studio | $3 | $3 | Serverless |
| AI21 Labs J2-Mid | AWS Bedrock | $6 | $6 | Serverless |
| AI21 Labs J2-Ultra | AWS Bedrock | $9 | $9 | Serverless |
| Jurassic-2 Mid | AWS Bedrock | $12.5 | $12.5 | Serverless |
| Jurassic-2 Mid | AI21 Studio | $12.5 | $12.5 | Serverless |
| Jurassic-2 Chat | AI21 Studio | $12.5 | $12.5 | Serverless |
| Jurassic-2 Ultra | AWS Bedrock | $18.8 | $18.8 | Serverless |
| Jurassic-2 Ultra | AI21 Studio | $18.8 | $18.8 | Serverless |
