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Claude Haiku 4.5 vs DeepSeek V4 Flash 0423

Updated October 21, 2026. 46 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Haiku 4.5 Replace DeepSeek V4 Flash 0423
Claude Haiku 4.5Anthropic
Coding
49.8
Overall
16.9
Output $/M
$5.00
2
DeepSeek V4 Flash 0423DeepSeek
Coding
54.6
Overall
24.4
Output $/M
$0.182
44
vs boards won of 46 shared

Decision reading

Pick DeepSeek V4 Flash 0423 for coding: it scores 54.6 on the Vibe Coding Index against 49.8 for Claude Haiku 4.5, though on 1 benchmark against 3.

Pick Claude Haiku 4.5 when what matters is LMArena Text: expert or Design Arena: ASCII art, where it leads.

Model AClaude Haiku 4.5Anthropic49.8/1003 independent benchmarks$0.56 per solved taskModel BDeepSeek V4 Flash 0423DeepSeek54.6/1001 independent benchmarkNo cost per solved task
Shared results
46
Claude Haiku 4.5 only
48
DeepSeek V4 Flash 0423 only
2
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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
Claude Haiku 4.5 49.8 from 3 benchmarks, DeepSeek V4 Flash 0423 54.6 from 1 benchmark.
Widest category
Coding, 18.6 points apart on average over 7 shared benchmarks.
Widest single gap
LMArena WebDev: React: Claude Haiku 4.5 1326 against DeepSeek V4 Flash 0423 1585, 43.1 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against DeepSeek V4 Flash 0423 $0.182 per million output tokens, 27.5x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, DeepSeek V4 Flash 0423 1.05M.

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
CategoryClaude Haiku 4.5BarsDeepSeek V4 Flash 0423Ties
Coding07
Intelligence02
Agentic work01
Reasoning12
Math02
Knowledge04
Web design17
General019
All shared boards244
CodingLike-for-likeFour of these boards feed the Vibe Coding Index07
Coding benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
SWE-bench Verified66.6%Not measuredOnly Claude Haiku 4.5 measured
SWE-bench Multilingual64.7%Not measuredOnly Claude Haiku 4.5 measured
LiveBench coding48.1%Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev13301582DeepSeek V4 Flash 0423
AA Coding Index43.952.0DeepSeek V4 Flash 0423
LiveCodeBench (Vals AI)41.2%Not measuredOnly Claude Haiku 4.5 measured
SWE-bench Verified (Vals AI)66.6%Not measuredOnly Claude Haiku 4.5 measured
Vibe Code Bench (Vals AI)11.4%Not measuredOnly Claude Haiku 4.5 measured
Code migration (Vals AI)7.5%Not measuredOnly Claude Haiku 4.5 measured
ProgramBench (Vals AI)0.0%Not measuredOnly Claude Haiku 4.5 measured
Terminal-Bench 2.1 (Vals AI)43.8%Not measuredOnly Claude Haiku 4.5 measured
Terminal-Bench35.5%Not measuredOnly Claude Haiku 4.5 measured
WeirdML45.4%45.6%DeepSeek V4 Flash 0423
ALE-BenchNot measured678.2Only DeepSeek V4 Flash 0423 measured
LMArena Text: coding14541457DeepSeek V4 Flash 0423
LMArena Text: software and IT14391453DeepSeek V4 Flash 0423
LMArena WebDev: React13261585DeepSeek V4 Flash 0423
LMArena WebDev: HTML13181558DeepSeek V4 Flash 0423
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
AA Intelligence Index16.924.4DeepSeek V4 Flash 0423
Epoch Capabilities Index142.2146.1DeepSeek V4 Flash 0423
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
AA Agentic Index8.026.3DeepSeek V4 Flash 0423
LiveBench research42.2%Not measuredOnly Claude Haiku 4.5 measured
LiveBench browser40.0%Not measuredOnly Claude Haiku 4.5 measured
LiveBench long agentic11.1%Not measuredOnly Claude Haiku 4.5 measured
Finance Agent (Vals AI)31.0%Not measuredOnly Claude Haiku 4.5 measured
Tax Agent Bench (Vals AI)5.9%Not measuredOnly Claude Haiku 4.5 measured
Legal Research Bench (Vals AI)10.6%Not measuredOnly Claude Haiku 4.5 measured
Excel Modeling Benchmark (Vals AI)22.7%Not measuredOnly Claude Haiku 4.5 measured
BALROG31.2%Not measuredOnly Claude Haiku 4.5 measured
DeepResearch Bench45.5%Not measuredOnly Claude Haiku 4.5 measured
Vending-Bench 2$459Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index12
Reasoning benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
GPQA Diamond72.2%Not measuredOnly Claude Haiku 4.5 measured
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%Not measuredOnly Claude Haiku 4.5 measured
GPQA Diamond (Epoch AI run)71.2%Not measuredOnly Claude Haiku 4.5 measured
ARC-AGI47.7%Not measuredOnly Claude Haiku 4.5 measured
ARC-AGI-24.0%Not measuredOnly Claude Haiku 4.5 measured
SimpleBenchNot measured46.3%Only DeepSeek V4 Flash 0423 measured
Chess puzzles8.0%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: hard prompts14211444DeepSeek V4 Flash 0423
LMArena Text: expert14431441Claude Haiku 4.5
LMArena Text: hard prompts in English14351449DeepSeek V4 Flash 0423
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
AIME82.7%Not measuredOnly Claude Haiku 4.5 measured
MGSM (Vals AI)92.2%Not measuredOnly Claude Haiku 4.5 measured
OTIS Mock AIME66.7%Not measuredOnly Claude Haiku 4.5 measured
MATH level 596.4%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: math13981426DeepSeek V4 Flash 0423
LMArena Text: mathematical work14301432DeepSeek V4 Flash 0423
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
MMLU Pro78.7%Not measuredOnly Claude Haiku 4.5 measured
LegalBench (Vals AI)81.2%Not measuredOnly Claude Haiku 4.5 measured
CaseLaw (Vals AI)56.5%Not measuredOnly Claude Haiku 4.5 measured
CorpFin (Vals AI)60.6%Not measuredOnly Claude Haiku 4.5 measured
TaxEval (Vals AI)67.5%Not measuredOnly Claude Haiku 4.5 measured
MortgageTax (Vals AI)62.2%Not measuredOnly Claude Haiku 4.5 measured
MedQA (Vals AI)79.6%Not measuredOnly Claude Haiku 4.5 measured
MedCode (Vals AI)32.7%Not measuredOnly Claude Haiku 4.5 measured
SimpleQA Verified13.2%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: science14061446DeepSeek V4 Flash 0423
LMArena Text: medicine and healthcare13941448DeepSeek V4 Flash 0423
LMArena Text: legal and government14001439DeepSeek V4 Flash 0423
LMArena Text: business and finance14001425DeepSeek V4 Flash 0423
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index17
Web design benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
Design Arena: websites11221208DeepSeek V4 Flash 0423
Design Arena: UI components11001164DeepSeek V4 Flash 0423
Design Arena: game dev10971197DeepSeek V4 Flash 0423
Design Arena: data viz11241127DeepSeek V4 Flash 0423
Design Arena: 3D10721189DeepSeek V4 Flash 0423
Design Arena: all code categories11151205DeepSeek V4 Flash 0423
Design Arena: SVG10251155DeepSeek V4 Flash 0423
Design Arena: ASCII art11391109Claude Haiku 4.5
LiveBench design59.9%Not measuredOnly Claude Haiku 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index019
General benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
LiveBench data analysis59.3%Not measuredOnly Claude Haiku 4.5 measured
Public Benefits Bench (Vals AI)54.3%Not measuredOnly Claude Haiku 4.5 measured
SAGE (Vals AI)31.8%Not measuredOnly Claude Haiku 4.5 measured
MedScribe (Vals AI)85.2%Not measuredOnly Claude Haiku 4.5 measured
Vals Multimodal Index42.9%Not measuredOnly Claude Haiku 4.5 measured
DTBench73.6%86.4%DeepSeek V4 Flash 0423
LMCA30.9%35.9%DeepSeek V4 Flash 0423
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text13971432DeepSeek V4 Flash 0423
LMArena Text: instruction following14141421DeepSeek V4 Flash 0423
LMArena Text: creative writing13711403DeepSeek V4 Flash 0423
LMArena Text: English14141441DeepSeek V4 Flash 0423
LMArena Text: non-English13771419DeepSeek V4 Flash 0423
LMArena Text: Chinese14181463DeepSeek V4 Flash 0423
LMArena Text: German13741419DeepSeek V4 Flash 0423
LMArena Text: Japanese13381389DeepSeek V4 Flash 0423
LMArena Text: Korean13461383DeepSeek V4 Flash 0423
LMArena Text: French14111439DeepSeek V4 Flash 0423
LMArena Text: Spanish14211436DeepSeek V4 Flash 0423
LMArena Text: Russian13811427DeepSeek V4 Flash 0423
LMArena Text: Polish13431436DeepSeek V4 Flash 0423
LMArena Text: multi-turn14091449DeepSeek V4 Flash 0423
LMArena Text: longer queries14271434DeepSeek V4 Flash 0423
LMArena Text: writing and language13861410DeepSeek V4 Flash 0423
LMArena Text: entertainment and media13691400DeepSeek V4 Flash 0423
LMArena Document1420Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 20 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Haiku 4.5 and DeepSeek V4 Flash 0423
BenchmarkClaude Haiku 4.5DeepSeek V4 Flash 0423Leader
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

Claude Haiku 4.5$0.0035Fits in one request
DeepSeek V4 Flash 0423$0.0002Fits in one request

DeepSeek V4 Flash 0423 costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
DeepSeek V4 Flash 0423$0.0051Fits in one request

DeepSeek V4 Flash 0423 costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
DeepSeek V4 Flash 0423$0.020Fits in one request

DeepSeek V4 Flash 0423 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 Claude Haiku 4.5 and DeepSeek V4 Flash 0423
SpecificationAnthropic Claude Haiku 4.5DeepSeek V4 Flash 0423
MakerAnthropicDeepSeek
WeightsNo public weights listedOpen weights
ReleasedOctober 15, 2025April 24, 2026
Context window200K1.05M
Input $/Mtok$1.00$0.091
Output $/Mtok$5.00$0.182
Coding index49.854.6
Independent measurements behind it31
Cost per solved task$0.56Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Haiku 4.5 better than DeepSeek V4 Flash 0423 for coding?

Pick DeepSeek V4 Flash 0423 for coding: it scores 54.6 on the Vibe Coding Index against 49.8 for Claude Haiku 4.5, though on 1 benchmark against 3. Pick Claude Haiku 4.5 when what matters is LMArena Text: expert or Design Arena: ASCII art, where it leads.

Which is cheaper, Claude Haiku 4.5 or DeepSeek V4 Flash 0423?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; DeepSeek V4 Flash 0423 costs $0.091 and $0.182. Cost per solved task is known for Claude Haiku 4.5 only.

Which has the bigger context window, Claude Haiku 4.5 or DeepSeek V4 Flash 0423?

DeepSeek V4 Flash 0423, with 1.05M tokens against 200K.

How many benchmarks is the Claude Haiku 4.5 vs DeepSeek V4 Flash 0423 comparison based on?

46 benchmarks have a result for both models as of October 21, 2026. Claude Haiku 4.5's coding index rests on 3 independent benchmarks and DeepSeek V4 Flash 0423's on 1. Where only one model has a result, the page says so instead of naming a winner.

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