Mini toolsTrinity Large Thinking
By Arcee AI
Trinity-Large-Thinking is Arcee AI’s official reasoning release in the Trinity Large line, designed for complex agent workflows rather than simple chat. Arcee says it adds explicit “thinking” behavior over the earlier Preview model, leading to stronger multi-turn tool calling, better long-context coherence, cleaner instruction following, and more stable behavior in long-running loops. The company positions it as a frontier open model for developers and enterprises, with weights released under Apache 2.0 and API availability alongside OpenRouter access. Arcee also reports it ranks #2 on PinchBench while being priced far below leading closed alternatives.
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Gen 7
Overview
Trinity-Large-Thinking is Arcee AI’s open-source reasoning model for long-horizon agents and multi-turn tool use. It is built to improve context coherence, instruction following, and stability across extended agent loops, and is released under Apache 2.0 for developers and enterprises that want open weights they can inspect, host, and post-train.
About Arcee AI
Arcee AI: A US-based Open Intelligence Lab
Three frontier models in six months. All open-weight
Benchmark scores
How Trinity Large Thinking ranks on tracked AI benchmarks. Click any benchmark to see its full leaderboard.
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Last updated: April 2, 2026
