Grok-4.1 Fast Non-Reasoning vs Jamba 1.5 Large
Comparing Grok-4.1 Fast Non-Reasoning and Jamba 1.5 Large across benchmarks, pricing, and capabilities.
xAI · AI21 Labs · Updated for 2026
Which is better?
Grok-4.1 Fast Non-Reasoning and Jamba 1.5 Large trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, Grok-4.1 Fast Non-Reasoning is roughly 12.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok-4.1 Fast Non-Reasoning also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Grok-4.1 Fast Non-Reasoning
- cost matters — it's about 12.7x cheaper per token
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Nov 2025
Choose Jamba 1.5 Large
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
0 reported for Grok-4.1 Fast Non-Reasoning · 8 for Jamba 1.5 Large
Grok-4.1 Fast Non-Reasoning and Jamba 1.5 Largedon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Grok-4.1 Fast Non-Reasoning ($0.20/1M tokens) is 10.0x cheaper than Jamba 1.5 Large ($2.00/1M tokens).
For output processing, Grok-4.1 Fast Non-Reasoning ($0.50/1M tokens) is 16.0x cheaper than Jamba 1.5 Large ($8.00/1M tokens).
In conclusion, Jamba 1.5 Large is more expensive than Grok-4.1 Fast Non-Reasoning.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok-4.1 Fast Non-Reasoning accepts 2,000,000 input tokens compared to Jamba 1.5 Large's 256,000 tokens. Jamba 1.5 Large can generate longer responses up to 256,000 tokens, while Grok-4.1 Fast Non-Reasoning is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Grok-4.1 Fast Non-Reasoning supports multimodal inputs, whereas Jamba 1.5 Large does not.
Grok-4.1 Fast Non-Reasoning can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok-4.1 Fast Non-Reasoning
Jamba 1.5 Large
License
Usage and distribution terms
Grok-4.1 Fast Non-Reasoning is licensed under a proprietary license, while Jamba 1.5 Large uses Jamba Open Model License.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Jamba Open Model License
Open weights
Release Timeline
When each model was launched
Grok-4.1 Fast Non-Reasoning was released on 2025-11-17, while Jamba 1.5 Large was released on 2024-08-22.
Grok-4.1 Fast Non-Reasoning is 15 months newer than Jamba 1.5 Large.
Nov 17, 2025
10 months ago
1.2yr newerAug 22, 2024
2.1 years ago
Knowledge Cutoff
When training data ends
Jamba 1.5 Large has a documented knowledge cutoff of 2024-03-05, while Grok-4.1 Fast Non-Reasoning's cutoff date is not specified.
We can confirm Jamba 1.5 Large's training data extends to 2024-03-05, but cannot make a direct comparison without Grok-4.1 Fast Non-Reasoning's cutoff date.
—
Mar 2024
Provider Availability
Grok-4.1 Fast Non-Reasoning is available from xAI. Jamba 1.5 Large is available from Bedrock, Google.
Grok-4.1 Fast Non-Reasoning
Jamba 1.5 Large
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4.1 Fast Non-Reasoning and Jamba 1.5 Large side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4.1 Fast Non-Reasoning vs Jamba 1.5 Large.