IBM released the Granite 4.1 open-source model family on April 29, 2026, on the same day as Mistral Medium 3.5, creating an interesting “same-stage competition.” Granite 4.1 uses Apache 2.0 license and includes dense text models plus dedicated vision and speech variants.
Core Specifications
| Metric | Value |
|---|---|
| Architecture | Dense text |
| Context Window | 512K tokens |
| Variants | Text, Vision, Speech |
| License | Apache 2.0 |
| Open Source | Yes |
Granite 4.1’s most prominent feature is its 512K context window, among the largest in models of comparable size. This means it can process extremely long documents, codebases, or multi-turn conversation histories in a single pass.
The Strategic Value of Apache 2.0
In community discussions, Granite 4.1’s Apache 2.0 license is considered one of its most competitive features. Community analysts note this allows regulated industries (healthcare, finance, government) to run the model fully on-premises without license concerns — a differentiated advantage that OpenAI and Anthropic currently cannot offer.
By contrast, Mistral Medium 3.5’s research license places more constraints on commercial use. If your team requires a fully free commercial license, Granite 4.1 is the safer choice.
Comparison with Same-Day Releases
Granite 4.1-30B is comparable in size to Qwen3.6-27B. Community benchmarks show Qwen3.6-27B scoring ~37 on the Artificial Analysis index vs. Granite 4.1-30B at ~15. This suggests Qwen3.6 leads in comprehensive capability, but Granite 4.1’s 512K context and Apache 2.0 license create a different value proposition.
Granite 4.1 is better suited for:
- Document analysis tasks requiring ultra-long context
- On-premises deployment in regulated industries
- Enterprises with mandatory Apache 2.0 license requirements
Quick Start
Granite 4.1 is available on Hugging Face:
pip install transformersRefer to the official IBM Granite repository for specific model weights.
Primary Sources
- IBM Granite 4.1 GitHub
- Hugging Face Granite 4.1
- Community discussion (X/Twitter)