DeepSeek V4.1 Flash 1017 vs Hy4 preview

DeepSeek V4.1 Flash 1017 leads Hy4 preview on coding, 70.3 to 44.3 on the Vibe Coding Index, and DeepSeek V4.1 Flash 1017 costs 4.2x less per output token ($0.60 vs $2.501 per million). Updated October 22, 2026; 12 benchmarks have a result for both.

Replace DeepSeek V4.1 Flash 1017 Replace Hy4 preview

DeepSeek V4.1 Flash 1017DeepSeek

Coding: 70.3
Overall: 67.6
Output $/M: $0.60

Hy4 previewTencent

Coding: 44.3
Overall: No data
Output $/M: $2.501

vs boards won of 12 shared, 1 tied

DeepSeek V4.1 Flash 1017 or Hy4 preview: which to pick

Pick DeepSeek V4.1 Flash 1017 for coding: it scores 70.3 on the Vibe Coding Index against 44.3 for Hy4 preview.

Pick Hy4 preview for work measured by Code migration (Vals AI), where it leads.

Model ADeepSeek V4.1 Flash 1017DeepSeek70.3/1004 independent benchmarksNo cost per solved task Model BHy4 previewTencent44.3/1003 independent benchmarksNo cost per solved task

122712

Shared results: 12
DeepSeek V4.1 Flash 1017 only: 27
Hy4 preview only: 12
Like-for-like categories: 3 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, six public coding benchmarks
DeepSeek V4.1 Flash 1017
DeepSeek V4.1 Flash 1017 scores 70.3 against 44.3.
4 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only DeepSeek V4.1 Flash 1017 has a AA Intelligence Index result, 39.5.
Directional only
Web design
Design Arena: websites
No call
Only DeepSeek V4.1 Flash 1017 has a Design Arena: websites result, 1311.
Directional only
General
Vals Index
DeepSeek V4.1 Flash 1017
DeepSeek V4.1 Flash 1017 leads, 61.3% against 53.2%.
Same board, both measured
Long documents
Listed context window
No call
Both take 1.05M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V4.1 Flash 1017
DeepSeek V4.1 Flash 1017 $0.0004, Hy4 preview $0.0021 per turn.
List prices

At a glance

Coding index: DeepSeek V4.1 Flash 1017 70.3 from 4 benchmarks, Hy4 preview 44.3 from 3 benchmarks.
Widest category: Coding, 8.3 points apart on average over 6 shared benchmarks.
Widest single gap: Terminal-Bench 4 (Vals AI): DeepSeek V4.1 Flash 1017 31.8% against Hy4 preview 8.1%, 31.7 points apart on a 0 to 100 scale.
Output price: DeepSeek V4.1 Flash 1017 $0.60 against Hy4 preview $2.501 per million output tokens, 4.2x apart.
Context window: Both take 1.05M tokens.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	DeepSeek V4.1 Flash 1017	Hy4 preview	Ties
Coding	5	1
Agentic work	4	0	1 tie
General	1	0
All shared boards	10	1	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index51

Coding benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
LiveBench coding	96.0%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
LMArena WebDev	1664	1631	DeepSeek V4.1 Flash 1017
Terminal-Bench 4 (Vals AI)	31.8%	8.1%	DeepSeek V4.1 Flash 1017
Vibe Code Bench (Vals AI)	87.7%	77.5%	DeepSeek V4.1 Flash 1017
Code migration (Vals AI)	44.2%	47.4%	Hy4 preview
ProgramBench (Vals AI)	Not measured	0.0%	Only Hy4 preview measured
IOI (Vals AI)	Not measured	59.3%	Only Hy4 preview measured
Terminal-Bench 2.1 (Vals AI)	Not measured	55.1%	Only Hy4 preview measured
CyberBench (Vals AI)	Not measured	65.4%	Only Hy4 preview measured
SciCode	55.9%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
ALE-Bench	1622.0	Not measured	Only DeepSeek V4.1 Flash 1017 measured
LMArena WebDev: React	1667	1653	DeepSeek V4.1 Flash 1017
LMArena WebDev: HTML	1687	1620	DeepSeek V4.1 Flash 1017
Neither model has a result on the other 26 boards here

IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared

Intelligence benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
AA Intelligence Index	39.5	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Neither model has a result on the other 1 board here

Agentic workLike-for-likePublic boards, shown as published, kept out of the index40

Agentic work benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
Design Arena: spreadsheets	1260	Not measured	Only DeepSeek V4.1 Flash 1017 measured
LiveBench research	79.5%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
LiveBench browser	76.0%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
LiveBench long agentic	50.9%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
SREBench (Vals AI)	Not measured	2.3%	Only Hy4 preview measured
Finance Agent (Vals AI)	57.0%	55.1%	DeepSeek V4.1 Flash 1017
Tax Agent Bench (Vals AI)	44.4%	32.6%	DeepSeek V4.1 Flash 1017
Legal Research Bench (Vals AI)	45.2%	45.2%	Tie
Harvey's Legal Agent Benchmark (Vals AI)	14.2%	8.8%	DeepSeek V4.1 Flash 1017
Excel Modeling Benchmark (Vals AI)	61.8%	58.1%	DeepSeek V4.1 Flash 1017
BioMysteryBench (Vals AI)	Not measured	69.3%	Only Hy4 preview measured
Terminal-Bench-Science (Vals AI)	Not measured	1.4%	Only Hy4 preview measured
Neither model has a result on the other 29 boards here

ReasoningDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared

Reasoning benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
LiveBench reasoning	89.1%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Humanity's Last Exam (Artificial Analysis run)	43.3%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
GPQA Diamond (Epoch AI run)	93.2%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Chess puzzles	46.0%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Mystery game puzzles	49.0%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Neither model has a result on the other 17 boards here

MathDirectional onlyPublic boards, shown as published, kept out of the index4 boards, none shared

Math benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
OTIS Mock AIME	99.4%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
FrontierMath, tiers 1 to 3	71.2%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
FrontierMath, tier 4	46.3%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
ProofBench	Not measured	75.0%	Only Hy4 preview measured
Neither model has a result on the other 9 boards here

KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index3 boards, none shared

Knowledge benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
LegalBench (Vals AI)	Not measured	83.8%	Only Hy4 preview measured
MedCode (Vals AI)	Not measured	43.3%	Only Hy4 preview measured
SimpleQA Verified	42.5%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Neither model has a result on the other 15 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared

Web design benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
Design Arena: websites	1311	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Design Arena: UI components	1306	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Design Arena: game dev	1353	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Design Arena: data viz	1312	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Design Arena: 3D	1358	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Design Arena: all code categories	1331	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Design Arena: ASCII art	1235	Not measured	Only DeepSeek V4.1 Flash 1017 measured
LiveBench design	83.4%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index10

General benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
Vals Index	61.3%	53.2%	DeepSeek V4.1 Flash 1017
LiveBench data analysis	79.5%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Public Benefits Bench (Vals AI)	Not measured	68.6%	Only Hy4 preview measured
MedScribe (Vals AI)	Not measured	83.6%	Only Hy4 preview measured
Long context reasoning (AA-LCR)	82.7%	Not measured	Only DeepSeek V4.1 Flash 1017 measured
Neither model has a result on the other 41 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for DeepSeek V4.1 Flash 1017 and Hy4 preview
Benchmark	DeepSeek V4.1 Flash 1017	Hy4 preview	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

DeepSeek V4.1 Flash 1017$0.0004Fits in one request

Hy4 preview$0.0021Fits in one request

DeepSeek V4.1 Flash 1017 costs less

Repository review

50K input + 3K output tokens

DeepSeek V4.1 Flash 1017$0.0093Fits in one request

Hy4 preview$0.049Fits in one request

DeepSeek V4.1 Flash 1017 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4.1 Flash 1017$0.036Fits in one request

Hy4 preview$0.192Fits in one request

DeepSeek V4.1 Flash 1017 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of DeepSeek V4.1 Flash 1017 and Hy4 preview
Specification	DeepSeek V4.1 Flash 1017	Tencent Hy4 preview
Maker	DeepSeek	Tencent
Weights	Open weights	Open weights
Released	October 17, 2026	August 28, 2026
Context window	1.05M	1.05M
Input $/Mtok	$0.15	$0.834
Output $/Mtok	$0.60	$2.501
Coding index	70.3	44.3
Independent measurements behind it	4	3
Cost per solved task	Not computable	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is DeepSeek V4.1 Flash 1017 better than Hy4 preview for coding?

Pick DeepSeek V4.1 Flash 1017 for coding: it scores 70.3 on the Vibe Coding Index against 44.3 for Hy4 preview. Pick Hy4 preview for work measured by Code migration (Vals AI), where it leads.

Which is cheaper, DeepSeek V4.1 Flash 1017 or Hy4 preview?

DeepSeek V4.1 Flash 1017 costs $0.15 per million input tokens and $0.60 per million output tokens; Hy4 preview costs $0.834 and $2.501. Cost per solved task is known for neither of them.

Which has the bigger context window, DeepSeek V4.1 Flash 1017 or Hy4 preview?

Neither: both take 1.05M tokens.

How many benchmarks is the DeepSeek V4.1 Flash 1017 vs Hy4 preview comparison based on?

12 benchmarks have a result for both models as of October 22, 2026. DeepSeek V4.1 Flash 1017's coding index rests on 4 independent benchmarks and Hy4 preview's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/deepseek-v4-1-flash-1017-vs-tencent-hy4-preview" title="DeepSeek V4.1 Flash 1017 vs Hy4 preview, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/deepseek-v4-1-flash-1017-vs-tencent-hy4-preview">LLMBenchmark.ai, DeepSeek V4.1 Flash 1017 vs Hy4 preview</a></p>

DeepSeek V4.1 Flash 1017 or Hy4 preview: which to pick

Which one for your work

Coding

Intelligence

Web design

General

Long documents

Everyday cost

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next