AI21 Labs vs Writer: Token Pricing, Speed & Intelligence
Full comparison of AI21 Labs and Writer — live token pricing, latency, throughput, context window, strengths, weaknesses, and best use cases. Rates sourced from public APIs — verify before use.
AI21 Labs
Jamba 1.6 — hybrid SSM-Transformer models with 256K context
AI21 Labs develops the Jamba model family, which uses a hybrid SSM (Mamba) and Transformer architecture. Jamba 1.6 Large and Mini offer 256K token context windows at competitive prices. The hybrid architecture delivers faster inference and lower memory usage than pure-Transformer models of comparable size.
Writer
Palmyra X5 — enterprise-grade LLM with 1M context, function calling, and on-premise deployment
Writer builds enterprise LLMs under the Palmyra brand. Palmyra X5 is their 2025 flagship — a 200B-parameter model with a 1M-token context window, strong coding and reasoning benchmarks, and full function calling support. Writer's platform includes Palmyra X5 Mini (efficient tier), a no-code AI app builder (Writer Framework), and enterprise deployment options including on-premise and private cloud. Palmyra X5 is available on Amazon Bedrock for AWS enterprise customers.
Key metric comparison
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Live token pricing
Strengths and weaknesses
AI21 Labs
Writer
Key differentiators
Jamba's hybrid SSM-Transformer architecture enables 256K context at lower memory and latency cost than pure-Transformer models — with Jamba 1.6 Mini among the cheapest 256K-context options available.
Palmyra X5 is purpose-built for enterprise — 1M context, Amazon Bedrock availability, on-premise deployment, and a no-code app builder — making Writer the most complete enterprise LLM platform outside OpenAI and Anthropic.
Frequently asked questions
AI21 Labs FAQs
What is the Jamba architecture?
Jamba uses a hybrid of Mamba (SSM) and Transformer layers. This reduces memory usage and improves throughput on long sequences compared to pure-Transformer models, while maintaining strong reasoning performance.
How much does AI21 Labs API cost?
Jamba 1.6 Large is $2.00/$8.00 per 1M input/output tokens. Jamba 1.6 Mini is $0.20/$0.40 per 1M tokens. Both support 256K context. See ai21.com/pricing for current rates.
What context window does Jamba 1.6 support?
Both Jamba 1.6 Large and Jamba 1.6 Mini support 256K token context windows, making them suitable for long-document analysis and extended conversations.
Writer FAQs
What is Palmyra X5?
Palmyra X5 is Writer's 2025 flagship LLM — a 200-billion-parameter model with a 1M-token context window, function calling, and strong coding and reasoning benchmarks. It is designed for enterprise workflows including compliance, knowledge grounding, and brand-consistent content generation.
Is Palmyra X5 available on Amazon Bedrock?
Yes. Palmyra X5 was added to the Amazon Bedrock catalog, making it accessible to AWS enterprise customers via the standard Bedrock API without a separate Writer account.
What is the Writer Framework?
Writer Framework is a no-code AI application builder that lets enterprise teams build, deploy, and manage AI-powered workflows without writing code. It integrates with Palmyra models and enterprise data sources.
Provider resources
AI21 Labs — Jamba 1.6 — hybrid SSM-Transformer models with 256K context
AI21 Labs develops the Jamba model family, which uses a hybrid SSM (Mamba) and Transformer architecture. Jamba 1.6 Large and Mini offer 256K token context windows at competitive prices. The hybrid architecture delivers faster inference and lower memory usage than pure-Transformer models of comparable size.
Jamba's hybrid SSM-Transformer architecture enables 256K context at lower memory and latency cost than pure-Transformer models — with Jamba 1.6 Mini among the cheapest 256K-context options available.
Writer — Palmyra X5 — enterprise-grade LLM with 1M context, function calling, and on-premise deployment
Writer builds enterprise LLMs under the Palmyra brand. Palmyra X5 is their 2025 flagship — a 200B-parameter model with a 1M-token context window, strong coding and reasoning benchmarks, and full function calling support. Writer's platform includes Palmyra X5 Mini (efficient tier), a no-code AI app builder (Writer Framework), and enterprise deployment options including on-premise and private cloud. Palmyra X5 is available on Amazon Bedrock for AWS enterprise customers.
Palmyra X5 is purpose-built for enterprise — 1M context, Amazon Bedrock availability, on-premise deployment, and a no-code app builder — making Writer the most complete enterprise LLM platform outside OpenAI and Anthropic.
Key strengths compared
AI21 Labs
- Hybrid SSM-Transformer architecture delivers faster inference than pure-Transformer models
- 256K token context window on both Jamba 1.6 Large and Mini
- Jamba 1.6 Mini at $0.20/$0.40 per 1M tokens is highly cost-competitive
- Smaller model family than frontier labs — two models vs dozens at OpenAI or Anthropic
- Less ecosystem support than OpenAI-compatible providers
Writer
- Palmyra X5: 200B model with 1M context window and strong enterprise benchmarks
- Available on Amazon Bedrock — accessible to AWS enterprise customers
- Writer Framework: no-code AI app builder for enterprise teams
- Smaller developer community than OpenAI/Anthropic
- Less suited for general-purpose consumer chat
Key weaknesses compared
AI21 Labs
- Smaller model family than frontier labs — two models vs dozens at OpenAI or Anthropic
- Less ecosystem support than OpenAI-compatible providers
- No image, audio, or multimodal models
Writer
- Smaller developer community than OpenAI/Anthropic
- Less suited for general-purpose consumer chat
- Fewer third-party integrations than frontier labs
Provider category context
AI21 Labs is a frontier lab, founded in 2017. Writer is a frontier lab, founded in 2020. Both are frontier lab providers — the comparison is primarily about pricing, model selection, and feature differentiation within the same tier.
How to choose between them
Both AI21 Labs and Writer are frontier labs with proprietary models. Choose based on benchmark performance for your specific task: AI21 Labs leads on hybrid ssm-transformer architecture delivers faster inference than pure-transformer models, while Writer leads on palmyra x5: 200b model with 1m context window and strong enterprise benchmarks. For cost-sensitive workloads, compare the cheapest model tier from each provider in the pricing table above — the gap between efficient-tier models is often larger than between flagship models.