DeepSeek V4.1 Flash 1017 | Epoch AI

ECI

N/A

DeepSeek

Oct. 17, 2026

Open weights

DeepSeek V4.1 Flash 1017 is an open-weights model from DeepSeek, released October 17, 2026.

DeepSeek V4.1 Flash 1017 vs select alternatives

Domain	Benchmark	DeepSeek V4.1 Flash 1017 DeepSeek Oct. 17, 2026 Open weights	Claude Opus 5.5 Anthropic Sep. 22, 2026 Closed weights	GPT-6 Astra OpenAI Sep. 3, 2026 Closed weights	Gemini 4 Argon Google DeepMind Sep. 30, 2026 Closed weights
Games	Chess PuzzlesBest score 76%	46%	67%	76%	59%
	Mystery Game PuzzlesBest score 84%	49%	71%	84%	64%
Mathematics	FrontierMath Tiers 1-3 (v2)Best score 94%	71%	91%	94%	86%
	FrontierMath Tier 4 (v2)Best score 100%	46%	95%	98%	78%
	OTIS Mock AIME 2024-2025Best score 100%	99%	100%	100%	100%
Science	GPQA DiamondBest score 96%	93%	91%	96%	96%
World knowledge	SimpleQA VerifiedBest score 76%	43%	72%	76%	76%

Model metadata

General
Organization	DeepSeek
Release date	Oct. 17, 2026
Model accessibility	Open weights
Country	China
Knowledge cutoff	Unknown
Provider notes	DeepSeek-V4.1-Flash-1017: Wish-Driven Programming Made Real

Pricing
Input price	$0.15 / 1M tokens
Output price	$0.60 / 1M tokens

Training
Parameters	Unknown
Training compute	Unknown
Training hardware	Unknown
Training time	Unknown
Training dataset size	Unknown