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DeepSeek V4.1 Flash vs Grok 4.5

DeepSeek V4.1 Flash leads Grok 4.5 on coding, 62.5 to 58.6 on the Vibe Coding Index, and DeepSeek V4.1 Flash costs 7.1x less per output token ($0.84 vs $6.00 per million). Updated October 22, 2026; 93 benchmarks have a result for both.

Replace DeepSeek V4.1 Flash Replace Grok 4.5
DeepSeek V4.1 FlashDeepSeek
Coding
62.5
Overall
62.4
Output $/M
$0.84
69
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
23
vs boards won of 93 shared, 1 tied

DeepSeek V4.1 Flash or Grok 4.5: which to pick

Pick DeepSeek V4.1 Flash for coding: it scores 62.5 on the Vibe Coding Index against 58.6 for Grok 4.5, though on 5 benchmarks against 6.

Pick Grok 4.5 for work measured by LiveBench coding or IOI (Vals AI), where it leads.

Model ADeepSeek V4.1 FlashDeepSeek62.5/1005 independent benchmarksNo cost per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
93
DeepSeek V4.1 Flash only
8
Grok 4.5 only
30
Like-for-like categories
8 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.

At a glance

Coding index
DeepSeek V4.1 Flash 62.5 from 5 benchmarks, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Agentic work, 9.4 points apart on average over 9 shared benchmarks.
Widest single gap
LiveBench browser: DeepSeek V4.1 Flash 84.0% against Grok 4.5 44.0%, 40.0 points apart on a 0 to 100 scale.
Output price
DeepSeek V4.1 Flash $0.84 against Grok 4.5 $6.00 per million output tokens, 7.1x apart.
Context window
DeepSeek V4.1 Flash takes 1.05M tokens, Grok 4.5 500K.

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
CategoryDeepSeek V4.1 FlashBarsGrok 4.5Ties
Coding144
Intelligence11
Agentic work711 tie
Reasoning74
Math60
Knowledge34
Web design90
General229
All shared boards69231 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index144
Coding benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
LiveBench coding90.2%94.3%Grok 4.5
LMArena WebDev16181553DeepSeek V4.1 Flash
AA Coding IndexNot measured72.4Only Grok 4.5 measured
LiveCodeBench (Vals AI)Not measured87.3%Only Grok 4.5 measured
SWE-bench Verified (Vals AI)Not measured86.6%Only Grok 4.5 measured
Terminal-Bench 4 (Vals AI)19.7%8.6%DeepSeek V4.1 Flash
Vibe Code Bench (Vals AI)84.7%69.0%DeepSeek V4.1 Flash
Code migration (Vals AI)45.6%36.6%DeepSeek V4.1 Flash
ProgramBench (Vals AI)0.5%0.0%DeepSeek V4.1 Flash
IOI (Vals AI)40.3%40.6%Grok 4.5
Terminal-Bench 2.1 (Vals AI)74.5%67.8%DeepSeek V4.1 Flash
SWE-bench Multimodal (Vals AI)46.5%Not measuredOnly DeepSeek V4.1 Flash measured
Vibe Code Bench 1-100 (Vals AI)16.4%Not measuredOnly DeepSeek V4.1 Flash measured
SkillsBench (Vals AI)69.8%66.0%DeepSeek V4.1 Flash
CyberBench (Vals AI)73.7%71.0%DeepSeek V4.1 Flash
SciCode51.9%55.0%Grok 4.5
FrontierCode43.9%42.4%DeepSeek V4.1 Flash
WeirdMLNot measured46.4%Only Grok 4.5 measured
ALE-Bench1092.31309.3Grok 4.5
LMArena Text: coding15021474DeepSeek V4.1 Flash
LMArena Text: software and IT14961471DeepSeek V4.1 Flash
LMArena WebDev: React16281556DeepSeek V4.1 Flash
LMArena WebDev: HTML16121567DeepSeek V4.1 Flash
LMArena WebDev: from an image16061562DeepSeek V4.1 Flash
SciCodeNot measured6.5%Only Grok 4.5 measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
AA Intelligence Index24.738.8Grok 4.5
Epoch Capabilities Index155.9154.1DeepSeek V4.1 Flash
Agentic workLike-for-likePublic boards, shown as published, kept out of the index71
Agentic work benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
AA Agentic IndexNot measured41.2Only Grok 4.5 measured
Design Arena: agents building web appsNot measured1218Only Grok 4.5 measured
Design Arena: agents building full-stack appsNot measured1249Only Grok 4.5 measured
Design Arena: agents building mobile appsNot measured1220Only Grok 4.5 measured
Design Arena: agents building Android appsNot measured1236Only Grok 4.5 measured
Design Arena: agents building Godot gamesNot measured1229Only Grok 4.5 measured
Design Arena: agents building gamesNot measured1236Only Grok 4.5 measured
Design Arena: HTML slidesNot measured1205Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1230Only Grok 4.5 measured
LiveBench research86.8%85.9%DeepSeek V4.1 Flash
LiveBench browser84.0%44.0%DeepSeek V4.1 Flash
LiveBench long agentic40.1%27.9%DeepSeek V4.1 Flash
SREBench (Vals AI)0.8%0.8%Tie
Finance Agent (Vals AI)53.5%48.4%DeepSeek V4.1 Flash
Tax Agent Bench (Vals AI)26.6%24.9%DeepSeek V4.1 Flash
Legal Research Bench (Vals AI)41.4%38.0%DeepSeek V4.1 Flash
Excel Modeling Benchmark (Vals AI)57.2%52.9%DeepSeek V4.1 Flash
BioMysteryBench (Vals AI)67.8%Not measuredOnly DeepSeek V4.1 Flash measured
Terminal-Bench-Science (Vals AI)0.0%Not measuredOnly DeepSeek V4.1 Flash measured
Vals Science Index29.6%Not measuredOnly DeepSeek V4.1 Flash measured
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
APEX-Agents39.5%56.2%Grok 4.5
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2Not measured$3,887Only Grok 4.5 measured
LMArena SearchNot measured1216Only Grok 4.5 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index74
Reasoning benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
GPQA DiamondNot measured92.9%Only Grok 4.5 measured
LiveBench reasoning86.7%87.2%Grok 4.5
MysteryMechanism (Vals AI)21.2%Not measuredOnly DeepSeek V4.1 Flash measured
MMMU Pro (Vals AI)Not measured61.8%Only Grok 4.5 measured
GPQA Diamond (Artificial Analysis run)Not measured93.1%Only Grok 4.5 measured
Humanity's Last Exam (Artificial Analysis run)39.2%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)89.8%93.4%Grok 4.5
ARC-AGI94.5%87.2%DeepSeek V4.1 Flash
ARC-AGI-272.9%52.6%DeepSeek V4.1 Flash
SimpleBenchNot measured70.0%Only Grok 4.5 measured
Chess puzzles48.0%35.0%DeepSeek V4.1 Flash
Mystery game puzzles43.0%Not measuredOnly DeepSeek V4.1 Flash measured
LMArena Text: hard prompts14831462DeepSeek V4.1 Flash
LMArena Text: expert15011465DeepSeek V4.1 Flash
LMArena Text: hard prompts in English14881464DeepSeek V4.1 Flash
LMArena Vision: diagrams12971304Grok 4.5
LMArena Vision: homework13071295DeepSeek V4.1 Flash
Kagi LLM BenchmarkNot measured83.5%Only Grok 4.5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
OTIS Mock AIME98.3%97.8%DeepSeek V4.1 Flash
FrontierMath, tiers 1 to 367.4%57.2%DeepSeek V4.1 Flash
FrontierMath, tier 426.8%24.4%DeepSeek V4.1 Flash
ProofBench54.0%31.0%DeepSeek V4.1 Flash
LMArena Text: math14781460DeepSeek V4.1 Flash
LMArena Text: mathematical work14851482DeepSeek V4.1 Flash
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index34
Knowledge benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
MMLU ProNot measured89.2%Only Grok 4.5 measured
LegalBench (Vals AI)83.3%86.0%Grok 4.5
CorpFin (Vals AI)Not measured67.4%Only Grok 4.5 measured
TaxEval (Vals AI)Not measured71.7%Only Grok 4.5 measured
MortgageTax (Vals AI)Not measured61.8%Only Grok 4.5 measured
MedCode (Vals AI)41.2%43.3%Grok 4.5
SimpleQA Verified42.9%48.3%Grok 4.5
LMArena Text: science14691464DeepSeek V4.1 Flash
LMArena Text: medicine and healthcare14841440DeepSeek V4.1 Flash
LMArena Text: legal and government14431463Grok 4.5
LMArena Text: business and finance14611441DeepSeek V4.1 Flash
FACTS Benchmark SuiteNot measured50.2%Only Grok 4.5 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
Design Arena: websites13081281DeepSeek V4.1 Flash
Design Arena: UI components13121280DeepSeek V4.1 Flash
Design Arena: game dev13301264DeepSeek V4.1 Flash
Design Arena: data viz12911266DeepSeek V4.1 Flash
Design Arena: 3D13551257DeepSeek V4.1 Flash
Design Arena: all code categories13201275DeepSeek V4.1 Flash
Design Arena: SVG12451215DeepSeek V4.1 Flash
Design Arena: ASCII art12651256DeepSeek V4.1 Flash
LiveBench design79.2%78.1%DeepSeek V4.1 Flash
GeneralLike-for-likePublic boards, shown as published, kept out of the index229
General benchmarks for DeepSeek V4.1 Flash and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
LiveBench data analysis79.3%73.0%DeepSeek V4.1 Flash
Public Benefits Bench (Vals AI)64.3%Not measuredOnly DeepSeek V4.1 Flash measured
SAGE (Vals AI)47.9%35.0%DeepSeek V4.1 Flash
MedScribe (Vals AI)85.5%86.9%Grok 4.5
Vals Multimodal IndexNot measured63.4%Only Grok 4.5 measured
Long context reasoning (AA-LCR)84.0%79.3%DeepSeek V4.1 Flash
DTBench89.9%96.5%Grok 4.5
LMCA47.0%45.2%DeepSeek V4.1 Flash
Surface Evolver Bench46.3%74.4%Grok 4.5
Furniture assembly34.2%22.5%DeepSeek V4.1 Flash
LMArena Text14641448DeepSeek V4.1 Flash
LMArena Text: instruction following14731445DeepSeek V4.1 Flash
LMArena Text: creative writing14371442Grok 4.5
LMArena Vision12781287Grok 4.5
LMArena Text: English14731453DeepSeek V4.1 Flash
LMArena Text: non-English14491440DeepSeek V4.1 Flash
LMArena Text: Chinese15011495DeepSeek V4.1 Flash
LMArena Text: German14701448DeepSeek V4.1 Flash
LMArena Text: Japanese14321430DeepSeek V4.1 Flash
LMArena Text: Korean14361406DeepSeek V4.1 Flash
LMArena Text: French14651457DeepSeek V4.1 Flash
LMArena Text: Spanish14591451DeepSeek V4.1 Flash
LMArena Text: Russian14671449DeepSeek V4.1 Flash
LMArena Text: Polish14571432DeepSeek V4.1 Flash
LMArena Text: multi-turn14611456DeepSeek V4.1 Flash
LMArena Text: longer queries14731462DeepSeek V4.1 Flash
LMArena Text: writing and language14501445DeepSeek V4.1 Flash
LMArena Text: entertainment and media14451434DeepSeek V4.1 Flash
LMArena Vision: English12881285DeepSeek V4.1 Flash
LMArena Vision: Chinese13271345Grok 4.5
LMArena Vision: reading text12821293Grok 4.5
LMArena Vision: humor12601276Grok 4.5
LMArena Vision: creative writing12751293Grok 4.5
LMArena DocumentNot measured1452Only Grok 4.5 measured
Neither model has a result on the other 12 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 and Grok 4.5
BenchmarkDeepSeek V4.1 FlashGrok 4.5Leader
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$0.0006Fits in one request
Grok 4.5$0.0050Fits in one request

DeepSeek V4.1 Flash costs less

Repository review

50K input + 3K output tokens

DeepSeek V4.1 Flash$0.014Fits in one request
Grok 4.5$0.118Fits in one request

DeepSeek V4.1 Flash costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4.1 Flash$0.053Fits in one request
Grok 4.5$0.460Fits in one request

DeepSeek V4.1 Flash 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 and Grok 4.5
SpecificationDeepSeek V4.1 FlashSpaceXAI Grok 4.5
MakerDeepSeekxAI
WeightsOpen weightsNo public weights listed
ReleasedSeptember 10, 2026July 8, 2026
Context window1.05M500K
Input $/Mtok$0.2225$2.00
Output $/Mtok$0.84$6.00
Coding index62.558.6
Independent measurements behind it56
Cost per solved taskNot computable$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V4.1 Flash better than Grok 4.5 for coding?

Pick DeepSeek V4.1 Flash for coding: it scores 62.5 on the Vibe Coding Index against 58.6 for Grok 4.5, though on 5 benchmarks against 6. Pick Grok 4.5 for work measured by LiveBench coding or IOI (Vals AI), where it leads.

Which is cheaper, DeepSeek V4.1 Flash or Grok 4.5?

DeepSeek V4.1 Flash costs $0.2225 per million input tokens and $0.84 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Cost per solved task is known for Grok 4.5 only.

Which has the bigger context window, DeepSeek V4.1 Flash or Grok 4.5?

DeepSeek V4.1 Flash, with 1.05M tokens against 500K.

How many benchmarks is the DeepSeek V4.1 Flash vs Grok 4.5 comparison based on?

93 benchmarks have a result for both models as of October 22, 2026. DeepSeek V4.1 Flash's coding index rests on 5 independent benchmarks and Grok 4.5's on 6. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/deepseek-v4-1-flash-vs-grok-4-5">LLMBenchmark.ai, DeepSeek V4.1 Flash vs Grok 4.5</a></p>