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Model comparison

Claude Opus 4.8 vs DeepSeek V4 Flash (Max)

Data verified

Head-to-head evidence from 32 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

78.34/100
No comparison
N/A
3 category wins1 category wins

Public leaderboard positions: Claude Opus 4.8 #5 (Supported); DeepSeek V4 Flash (Max) unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Opus 4.8 and DeepSeek V4 Flash (Max) share 32 comparable benchmark results. 4 of 8 categories are comparable. 21 results are unique to Claude Opus 4.8; 13 to DeepSeek V4 Flash (Max).

Updated July 23, 2026
Shared results
32
Claude Opus 4.8 only
21
DeepSeek V4 Flash (Max) only
13
Comparable categories
4 / 8

Treat this as a split decision. Claude Opus 4.8 makes more sense if agentic is the priority; DeepSeek V4 Flash (Max) is the better fit if mathematics is the priority or you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 32 shared benchmark results across 6 evidence categories; 4 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Claude Opus 4.8 and DeepSeek V4 Flash (Max) finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.

Claude Opus 4.8 is also the more expensive model on tokens at $5.00 input / $25.00 output per 1M tokens, versus $0.14 input / $0.28 output per 1M tokens for DeepSeek V4 Flash (Max). That is roughly 89.3x on output cost alone.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Claude Opus 4.8 and DeepSeek V4 Flash (Max)
CategoryClaude Opus 4.8ΔDeepSeek V4 Flash (Max)
MathClaude Opus 4.853.9Margin→ 40.9DeepSeek V4 Flash (Max)94.8
AgenticClaude Opus 4.880.3Margin← 16.5DeepSeek V4 Flash (Max)63.8
CodingClaude Opus 4.881.1Margin← 12.3DeepSeek V4 Flash (Max)68.8
KnowledgeClaude Opus 4.862.7Margin← 7.4DeepSeek V4 Flash (Max)55.3
MultimodalClaude Opus 4.877.0MarginNo overlapDeepSeek V4 Flash (Max)Not measured

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Claude Opus 4.8B · DeepSeek V4 Flash (Max)

  1. HLE

    Knowledge
    Source ↗
    A 57.9%B 34.8%
    Winner: Claude Opus 4.8Δ 23.1
    HLE: Claude Opus 4.8 scored 57.9%; DeepSeek V4 Flash (Max) scored 34.8%. Claude Opus 4.8 wins this benchmark.

  2. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 74.6%B 56.9%
    Winner: Claude Opus 4.8Δ 17.7
    Terminal-Bench 2.0: Claude Opus 4.8 scored 74.6%; DeepSeek V4 Flash (Max) scored 56.9%. Claude Opus 4.8 wins this benchmark.

  3. SWE-bench Pro

    Coding
    Source ↗
    A 69.2%B 52.6%
    Winner: Claude Opus 4.8Δ 16.6
    SWE-bench Pro: Claude Opus 4.8 scored 69.2%; DeepSeek V4 Flash (Max) scored 52.6%. Claude Opus 4.8 wins this benchmark.

  4. BrowseComp

    Agentic
    Source ↗
    A 84.3%B 73.2%
    Winner: Claude Opus 4.8Δ 11.1
    BrowseComp: Claude Opus 4.8 scored 84.3%; DeepSeek V4 Flash (Max) scored 73.2%. Claude Opus 4.8 wins this benchmark.

  5. SWE-bench Verified

    Coding
    Source ↗
    A 88.6%B 79%
    Winner: Claude Opus 4.8Δ 9.6
    SWE-bench Verified: Claude Opus 4.8 scored 88.6%; DeepSeek V4 Flash (Max) scored 79%. Claude Opus 4.8 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Opus 4.8DeepSeek V4 Flash (Max)Comparison
Input / output priceUSD per 1M tokensClaude Opus 4.8$5 input / $25 outputDeepSeek V4 Flash (Max)$0.14 input / $0.28 outputDeepSeek V4 Flash (Max) has the lower combined listed price.
Generation speedtokens per secondClaude Opus 4.8Not availableDeepSeek V4 Flash (Max)Not availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Opus 4.8Not availableDeepSeek V4 Flash (Max)Not availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Opus 4.81MDeepSeek V4 Flash (Max)1MListed context windows are equal.

Benchmark Deep Dive

AgenticClaude Opus 4.8 wins
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
Terminal-Bench 2.0Source 74.6%56.9%Claude Opus 4.8 leads
BrowseCompSource 84.3%73.2%Claude Opus 4.8 leads
DeepSearchQASource 93.1%—Not comparable
OSWorld-VerifiedSource 83.4%—Not comparable
Finance Agent v2Source 53.9%—Not comparable
GDPval-AASource 15941189Claude Opus 4.8 leads
MCP AtlasSource 82.2%69%Claude Opus 4.8 leads
ToolathlonSource 59.9%47.8%Claude Opus 4.8 leads
Gert LabsSource 72.97%—Not comparable
AA Agentic IndexSource 47.2%31.1%Claude Opus 4.8 leads
τ²-bench resultsSource 94.4%95%DeepSeek V4 Flash (Max) leads
GDPval-AASource 54.7%34.4%Claude Opus 4.8 leads
ResearchClawBenchSource 21.1%—Not comparable
OSWorld 2.0Source 20.6%—Not comparable
AA BriefcaseSource 1347831Claude Opus 4.8 leads
AA AutomationBenchSource 48.5%—Not comparable
AA EnterpriseOps-GymSource 44.0%39.6%Claude Opus 4.8 leads
AA Harvey LABSource 91.1%81.3%Claude Opus 4.8 leads
AA Tau3 BankingSource 27.6%22.9%Claude Opus 4.8 leads
terminalBenchHardSource 58.3%35.6%Claude Opus 4.8 leads
aaTerminalBench21Source 84.6%—Not comparable
HLE w/ toolsSource —45.1%Not comparable
AA ITBenchSource —31.5%Not comparable
CodingClaude Opus 4.8 wins
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
SWE-bench VerifiedSource 88.6%79%Claude Opus 4.8 leads
SWE-bench ProSource 69.2%52.6%Claude Opus 4.8 leads
SWE MultilingualSource 84.4%73.3%Claude Opus 4.8 leads
SWE MultimodalSource 38.4%—Not comparable
Terminal-Bench 2.0Source 74.6%56.9%Claude Opus 4.8 leads
cursorBench31Source 58.4%—Not comparable
cursorBench32Source 62.3%—Not comparable
AA Coding IndexSource 74.3%56.2%Claude Opus 4.8 leads
AA-SciCodeSource 53.5%44.9%Claude Opus 4.8 leads
FrontierCode 1.1 MainSource 46.5%—Not comparable
CodeforcesSource —3052.0Not comparable
Reasoning
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
AA-LCRSource 67.7%63.0%Claude Opus 4.8 leads
CritPtSource 20.9%7.1%Claude Opus 4.8 leads
MRCR 1MSource —78.7%Not comparable
CorpusQA 1MSource —60.5%Not comparable
KnowledgeClaude Opus 4.8 wins
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
GPQASource 93.6%88.1%Claude Opus 4.8 leads
GPQA-DSource 93.6%88.1%Claude Opus 4.8 leads
HLESource 57.9%34.8%Claude Opus 4.8 leads
HLE w/o toolsSource 49.8%—Not comparable
Artificial Analysis Intelligence IndexSource 55.7%40.3%Claude Opus 4.8 leads
AA-GPQA DiamondSource 92.0%89.4%Claude Opus 4.8 leads
AA-HLESource 45.7%32.1%Claude Opus 4.8 leads
AA-Omniscience IndexSource 27.4%-22.9%Claude Opus 4.8 leads
AA-Omniscience AccuracySource 46.6%37.2%Claude Opus 4.8 leads
AA-Omniscience Hallucination RateSource 35.9%95.8%Claude Opus 4.8 leads
MMLU-ProSource —86.2%Not comparable
SimpleQASource —34.1%Not comparable
Chinese-SimpleQASource —78.9%Not comparable
AA Openness IndexSource —50.0%Not comparable
MathDeepSeek V4 Flash (Max) wins
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
USAMO 2026Source 96.7%—Not comparable
FrontierMath v2 (Tiers 1-3)Source 47.241%—Not comparable
FrontierMath v2 (Tier 4)Source 31.250%—Not comparable
HMMT Feb 2026Source —94.8%Not comparable
IMOAnswerBenchSource —88.4%Not comparable
ApexSource —33.0%Not comparable
Apex ShortlistSource —85.7%Not comparable
Multilingual
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
INCLUDESource 87.6%—Not comparable
Multimodal
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
OfficeQA ProSource 66.2%—Not comparable
ScreenSpot ProSource 87.9%—Not comparable
CharXivSource 89.9%—Not comparable
CharXiv w/o toolsSource 80.5%—Not comparable
Design Arena WebsiteSource 12701238Claude Opus 4.8 leads
Inst. Following
BenchmarkClaude Opus 4.8DeepSeek V4 Flash (Max)Result
AA-IFBenchSource 62.2%79.2%DeepSeek V4 Flash (Max) leads
Frequently Asked Questions (5)

Which is better, Claude Opus 4.8 or DeepSeek V4 Flash (Max)?

Claude Opus 4.8 and DeepSeek V4 Flash (Max) are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.

Which is better for knowledge tasks, Claude Opus 4.8 or DeepSeek V4 Flash (Max)?

Claude Opus 4.8 has the edge for knowledge tasks in this comparison, averaging 62.7 versus 55.3. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.

Which is better for coding, Claude Opus 4.8 or DeepSeek V4 Flash (Max)?

Claude Opus 4.8 has the edge for coding in this comparison, averaging 81.1 versus 68.8. Inside this category, AA Coding Index is the benchmark that creates the most daylight between them.

Which is better for math, Claude Opus 4.8 or DeepSeek V4 Flash (Max)?

DeepSeek V4 Flash (Max) has the edge for math in this comparison, averaging 94.8 versus 53.9. Claude Opus 4.8 stays close enough that the answer can still flip depending on your workload.

Which is better for agentic tasks, Claude Opus 4.8 or DeepSeek V4 Flash (Max)?

Claude Opus 4.8 has the edge for agentic tasks in this comparison, averaging 80.3 versus 63.8. Inside this category, AA Briefcase is the benchmark that creates the most daylight between them.

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