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Claude Opus 5 vs DeepSeek V4 Flash 0423

Claude Opus 5 leads DeepSeek V4 Flash 0423 on the Artificial Analysis Intelligence Index, 50.8 to 24.4, and DeepSeek V4 Flash 0423 costs 89.3x less per output token ($0.28 vs $25.00 per million). Updated October 21, 2026; 48 benchmarks have a result for both.

Replace Claude Opus 5 Replace DeepSeek V4 Flash 0423
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
48
DeepSeek V4 Flash 0423DeepSeek
Coding
No data
Overall
No data
Output $/M
$0.28
0
vs boards won of 48 shared

Claude Opus 5 or DeepSeek V4 Flash 0423: which to pick

Only Claude Opus 5 has a coding score, 83.0 on the Vibe Coding Index; DeepSeek V4 Flash 0423 has none, so the two cannot be ranked on coding.

Pick DeepSeek V4 Flash 0423 for output tokens 89.3x cheaper ($0.28 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BDeepSeek V4 Flash 0423DeepSeekNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
48
Claude Opus 5 only
83
DeepSeek V4 Flash 0423 only
1
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
Claude Opus 5 83.0 from 6 benchmarks, DeepSeek V4 Flash 0423 not benchmarked.
Widest category
Agentic work, 30.2 points apart on average over 1 shared benchmark.
Widest single gap
ALE-Bench: Claude Opus 5 2164.6 against DeepSeek V4 Flash 0423 678.2, 49.5 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against DeepSeek V4 Flash 0423 $0.28 per million output tokens, 89.3x apart.
Context window
Claude Opus 5 takes 1M 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 Opus 5BarsDeepSeek V4 Flash 0423Ties
Coding80
Intelligence20
Agentic work10
Reasoning40
Math20
Knowledge40
Web design80
General190
All shared boards480
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
Coding benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891582Claude Opus 5
AA Coding Index78.052.0Claude Opus 5
LiveCodeBench (Vals AI)89.0%Not measuredOnly Claude Opus 5 measured
SWE-bench Verified (Vals AI)97.0%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%Not measuredOnly Claude Opus 5 measured
Code migration (Vals AI)57.5%Not measuredOnly Claude Opus 5 measured
ProgramBench (Vals AI)3.0%Not measuredOnly Claude Opus 5 measured
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%Not measuredOnly Claude Opus 5 measured
SciCode56.4%Not measuredOnly Claude Opus 5 measured
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
WeirdML91.8%45.6%Claude Opus 5
ALE-Bench2164.6678.2Claude Opus 5
LMArena Text: coding15331457Claude Opus 5
LMArena Text: software and IT15271453Claude Opus 5
LMArena WebDev: React17111585Claude Opus 5
LMArena WebDev: HTML16801558Claude Opus 5
LMArena WebDev: from an image1662Not measuredOnly Claude Opus 5 measured
SciCode13.8%Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
AA Intelligence Index50.824.4Claude Opus 5
Epoch Capabilities Index163.9146.1Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
AA Agentic Index56.526.3Claude Opus 5
Design Arena: agents building web apps1266Not measuredOnly Claude Opus 5 measured
Design Arena: agents building full-stack apps1306Not measuredOnly Claude Opus 5 measured
Design Arena: agents building mobile apps1348Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Android apps1254Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games1261Not measuredOnly Claude Opus 5 measured
Design Arena: PowerPoint slides1265Not measuredOnly Claude Opus 5 measured
LiveBench research88.9%Not measuredOnly Claude Opus 5 measured
LiveBench browser84.0%Not measuredOnly Claude Opus 5 measured
LiveBench long agentic62.1%Not measuredOnly Claude Opus 5 measured
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%Not measuredOnly Claude Opus 5 measured
Tax Agent Bench (Vals AI)45.5%Not measuredOnly Claude Opus 5 measured
Legal Research Bench (Vals AI)55.3%Not measuredOnly Claude Opus 5 measured
Excel Modeling Benchmark (Vals AI)73.6%Not measuredOnly Claude Opus 5 measured
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%Not measuredOnly Claude Opus 5 measured
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182Not measuredOnly Claude Opus 5 measured
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
Reasoning benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
GPQA Diamond93.4%Not measuredOnly Claude Opus 5 measured
LiveBench reasoning91.2%Not measuredOnly Claude Opus 5 measured
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Opus 5 measured
Humanity's Last Exam (Artificial Analysis run)54.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Epoch AI run)93.9%Not measuredOnly Claude Opus 5 measured
ARC-AGI97.5%Not measuredOnly Claude Opus 5 measured
ARC-AGI-290.4%Not measuredOnly Claude Opus 5 measured
SimpleBench80.6%46.3%Claude Opus 5
Chess puzzles43.0%Not measuredOnly Claude Opus 5 measured
Mystery game puzzles59.0%Not measuredOnly Claude Opus 5 measured
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271444Claude Opus 5
LMArena Text: expert15541441Claude Opus 5
LMArena Text: hard prompts in English15231449Claude Opus 5
LMArena Vision: diagrams1348Not measuredOnly Claude Opus 5 measured
LMArena Vision: homework1338Not measuredOnly Claude Opus 5 measured
Kagi LLM BenchmarkNot measured52.2%Only DeepSeek V4 Flash 0423 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
OTIS Mock AIME98.9%Not measuredOnly Claude Opus 5 measured
FrontierMath, tiers 1 to 385.6%Not measuredOnly Claude Opus 5 measured
FrontierMath, tier 473.2%Not measuredOnly Claude Opus 5 measured
ProofBench99.0%Not measuredOnly Claude Opus 5 measured
LMArena Text: math15331426Claude Opus 5
LMArena Text: mathematical work15441432Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
MMLU Pro91.6%Not measuredOnly Claude Opus 5 measured
LegalBench (Vals AI)87.0%Not measuredOnly Claude Opus 5 measured
CorpFin (Vals AI)73.2%Not measuredOnly Claude Opus 5 measured
TaxEval (Vals AI)75.1%Not measuredOnly Claude Opus 5 measured
MortgageTax (Vals AI)72.1%Not measuredOnly Claude Opus 5 measured
MedCode (Vals AI)63.6%Not measuredOnly Claude Opus 5 measured
SimpleQA Verified59.9%Not measuredOnly Claude Opus 5 measured
LMArena Text: science15311446Claude Opus 5
LMArena Text: medicine and healthcare15251448Claude Opus 5
LMArena Text: legal and government15301439Claude Opus 5
LMArena Text: business and finance15011425Claude Opus 5
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
Design Arena: websites13091208Claude Opus 5
Design Arena: UI components13491165Claude Opus 5
Design Arena: game dev13381197Claude Opus 5
Design Arena: data viz13291127Claude Opus 5
Design Arena: 3D13351189Claude Opus 5
Design Arena: all code categories13241205Claude Opus 5
Design Arena: SVG13111155Claude Opus 5
Design Arena: ASCII art13521109Claude Opus 5
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index190
General benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 5DeepSeek V4 Flash 0423Leader
LiveBench data analysis74.6%Not measuredOnly Claude Opus 5 measured
Public Benefits Bench (Vals AI)76.9%Not measuredOnly Claude Opus 5 measured
SAGE (Vals AI)49.4%Not measuredOnly Claude Opus 5 measured
MedScribe (Vals AI)91.0%Not measuredOnly Claude Opus 5 measured
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
Long context reasoning (AA-LCR)82.0%Not measuredOnly Claude Opus 5 measured
DTBench97.9%86.4%Claude Opus 5
LMCA64.5%35.9%Claude Opus 5
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091432Claude Opus 5
LMArena Text: instruction following15181421Claude Opus 5
LMArena Text: creative writing14931403Claude Opus 5
LMArena Vision1320Not measuredOnly Claude Opus 5 measured
LMArena Text: English15081441Claude Opus 5
LMArena Text: non-English15021419Claude Opus 5
LMArena Text: Chinese15731463Claude Opus 5
LMArena Text: German15271419Claude Opus 5
LMArena Text: Japanese15201389Claude Opus 5
LMArena Text: Korean15171383Claude Opus 5
LMArena Text: French15191439Claude Opus 5
LMArena Text: Spanish15231436Claude Opus 5
LMArena Text: Russian15071427Claude Opus 5
LMArena Text: Polish15221436Claude Opus 5
LMArena Text: multi-turn15001449Claude Opus 5
LMArena Text: longer queries15171434Claude Opus 5
LMArena Text: writing and language14991410Claude Opus 5
LMArena Text: entertainment and media14811400Claude Opus 5
LMArena Vision: English1315Not measuredOnly Claude Opus 5 measured
LMArena Vision: Chinese1400Not measuredOnly Claude Opus 5 measured
LMArena Vision: reading text1329Not measuredOnly Claude Opus 5 measured
LMArena Vision: humor1293Not measuredOnly Claude Opus 5 measured
LMArena Vision: creative writing1313Not measuredOnly Claude Opus 5 measured
LMArena Document1516Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5 and DeepSeek V4 Flash 0423
BenchmarkClaude Opus 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 Opus 5$0.018Fits in one request
DeepSeek V4 Flash 0423$0.0003Fits in one request

DeepSeek V4 Flash 0423 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
DeepSeek V4 Flash 0423$0.0073Fits in one request

DeepSeek V4 Flash 0423 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
DeepSeek V4 Flash 0423$0.029Fits 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 Opus 5 and DeepSeek V4 Flash 0423
SpecificationAnthropic Claude Opus 5DeepSeek V4 Flash 0423
MakerAnthropicDeepSeek
WeightsNo public weights listedOpen weights
ReleasedJuly 24, 2026April 24, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.13
Output $/Mtok$25.00$0.28
Coding index83.0Not benchmarked
Independent measurements behind it61
Cost per solved task$1.33Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than DeepSeek V4 Flash 0423 for coding?

Only Claude Opus 5 has a coding score, 83.0 on the Vibe Coding Index; DeepSeek V4 Flash 0423 has none, so the two cannot be ranked on coding. Pick DeepSeek V4 Flash 0423 for output tokens 89.3x cheaper ($0.28 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Opus 5 or DeepSeek V4 Flash 0423?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; DeepSeek V4 Flash 0423 costs $0.13 and $0.28. Cost per solved task is known for Claude Opus 5 only.

Which has the bigger context window, Claude Opus 5 or DeepSeek V4 Flash 0423?

DeepSeek V4 Flash 0423, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5 vs DeepSeek V4 Flash 0423 comparison based on?

48 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 6 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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