BasaltBASALTTry Monolith
Products

Powerful models.
Open weights.

1.6T
Parameters
1M
Context window
4 / 4
Benchmarks led
01 · Our flagship reasoning model.

Monolith

The full Monolith-1 experience. Complex multi-step reasoning, code, long-document synthesis, and coherent context across a full million-token window. Weights are open. Inference is available via API and on basaltlabs.org.

1.6T total / 49B active
Parameters
1M tokens
Context
MIT
License
02 · For teams that need more control.

Enterprise

Dedicated inference, custom fine-tuning support, on-premises deployment, SLA-backed uptime, and a named account team. Designed for organizations that can't share API endpoints with the open internet.

99.95%
Uptime SLA
Cloud / On-prem
Deployment
24/7
Support
Benchmarks · July 2026

First place,
on everything that matters.

All evaluations use the standard prompting protocols. We publish full evaluation code alongside every release so our numbers can be reproduced.

Benchmark
Monolith-1
GPT-5.4
Claude Opus 4.6
Gemini 3.1 Pro
Kimi K2.6
Humanity's Last Exam
99.4%
40.0%
40.0%
44.4%
34.7%
AIME 2025
100%
99.2%
96.7%
98.3%
96.4%
GPQA Diamond
95.9%
92.8%
91.3%
94.3%
90.5%
MMLU-Pro
96.2%*
90.2%
89.7%
90.8%
88.9%
* Evaluated using Basalt's internal harness. Full methodology in the technical report.
Full evaluation results, protocols, and reproduction code: basaltlabs.org/research