DeepSeek-V3.1-Terminus | Epoch AI

ECI

N/A

DeepSeek

Sep. 22, 2025

Open weights

DeepSeek-V3.1-Terminus is an open-weights model from DeepSeek, released September 22, 2025.

DeepSeek-V3.1-Terminus vs select alternatives

Domain	Benchmark	DeepSeek-V3.1-Terminus DeepSeek Sep. 22, 2025 Open weights	GPT-5 OpenAI Aug. 7, 2025 Closed weights	Grok 4 xAI Jul. 9, 2025 Closed weights	Gemini 2.5 Pro (Jun 2025) Google DeepMind Jun. 5, 2025 Closed weights
Conceptual reasoning	LMCABest score 68.2	28.6	40.0	—	34.8
	DTBenchBest score 99%	81%	91%	n/a	82%
Science	CritPtBest score 32%	2%	13%	n/a	2%
	SciCodeBest score 67%	41%	43%	n/a	43%
Software engineering	ALE-BenchBest score 2951	745	1162	—	786

Model metadata

General
Organization	DeepSeek
Release date	Sep. 22, 2025
Model accessibility	Open weights
Country	China
Knowledge cutoff	Unknown
Provider notes	The latest update builds on V3.1’s strengths while addressing key user feedback.

Pricing
Input price	$0.27 / 1M tokens
Output price	$1 / 1M tokens

Training
Parameters	6.7e11
Training compute	3.6e24 FLOP
Training hardware	Unknown
Training time	Unknown
Training dataset size	8.4e11 datapoints