Essential AI

At Essential AI, we're building an open platform to democratize frontier AI capabilities and accelerate breakthroughs globally through collaborative science.

[Essential AI @essential_ai]

Today, we’re excited to introduce Rnj-1, @essential_ai's first open model; a world-class 8B base + instruct pair, built with scientific rigor, intentional design, and a belief that the advancement and equitable distribution of AI depend on building in the open.

We bring American open-source at par with the best in the world.

[Essential AI @essential_ai]

Blog → https://t.co/JdHsbsx5Ji
Model → https://t.co/iUoXACJOaM

We have more exciting updates coming soon. Stay tuned!

[Essential AI @essential_ai]

Rnj-1 has outperformed other open models in its weight class in the largest open-source AI initiative in telecom to-date🚀

[Essential AI @essential_ai]

Farbod Tavakkoli from @ATT and @DiamosGreg from @tensorwave demonstrated world-class efficiency at scale, achieving exceptional utilization across 256 @AMD MI325X GPUs on TensorWave using ScalarLM.

This is a victory for American open weights models.

[Essential AI @essential_ai]

[5/5]

Check it out on Hugging Face🤗:
Model → https://t.co/iUoXACJOaM
GGUF → https://t.co/bOXEZ5EOpo
Evals → https://t.co/9ySbWzL7Bm

[Essential AI @essential_ai]

[1/5]

We thank the community for their feedback on Rnj-1. We’d like to announce a few updates to Rnj-1-instruct based on what we heard:

- Resolving premature truncation of generations and improved instruction following.
- Instructions for 128k context length extrapolation.
- Updated evals, baselines, and model generations for reproducibility.

Details follow 🧵

[Essential AI @essential_ai]

[4/5]

Our tables have been updated with the Olmo-3-7B-Instruct baseline, and we have added post-processing improvements to our STEM evals, boosting performance. For reproducibility, we release our eval prompts and generations.

[Essential AI @essential_ai]

The momentum is real. Let's go! 🚀

[Ashish Vaswani @ashVaswani]

Rnj-1-Instruct is now the #1 trending text generation model on HF!

[Essential AI @essential_ai]

https://t.co/iUoXACJOaM

[Essential AI @essential_ai]

We are now the #1 trending text-gen <256B size model on HuggingFace!!

[Essential AI @essential_ai]

Proud to carry the spirit of Ramanujan with rnj-1: honoring the great minds who showed how curiosity reshapes the world. The lineage of deep thinking is part of our mission. Essential proud.

[Divya Shivaprasad @DivShivaprasad]

Behind the scenes at Essential: long hours, tough problems, and a team driven by an unsatiable desire to build.

What keeps us going isn’t noise - it’s the scientific discipline. The work demands focus, rigor, and a willingness to push through uncertainty.

Proud to work with this special team @essential_ai @ashVaswani

[Essential AI @essential_ai]

Check it out https://t.co/KJZjBJHzFB

[Essential AI @essential_ai]

Rnj-1 is now live on @openrouter!

[Together AI @togethercompute]

@essential_ai Try Rnj-1 Instruct now on Together AI https://t.co/sz77rqZjCa

[Together AI @togethercompute]

@essential_ai Highlights:
👉 Dominant on SWE-bench, BFCL, and Enamel
👉 Strong tool use and function calling
👉 32K context window
👉 Apache 2.0 licensed, fully open weights
👉 Trained on 8.4T tokens with Muon optimizer

[Together AI @togethercompute]

Introducing Rnj-1 Instruct from @essential_ai, an open-source 8B model engineered for agentic coding and STEM tasks. AI natives can now use Rnj-1 Instruct on Together AI and benefit from reliable inference for production-scale software engineering and scientific workflows.

[Ashish Vaswani @ashVaswani]

We are beyond thrilled to share our first flagship models, Rnj-1 base and instruct 8B parameter models. Rnj-1 is the culmination of 10 months of hard work by a phenomenal team, dedicated to advancing American SOTA OSS AI.

Lots of wins with Rnj-1.

1. SWE bench performance close to GPT 4o.
2. Tool use outperforming all comparable open source models.
3. Mathematical reasoning (AIME’25) nearly at par with GPT OSS MoE 20B.

….