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Model comparison

DeepSeek V4 Flash (Max) vs Gemini 3.5 Flash

Data verified

Head-to-head evidence from 27 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

N/A
No comparison
64.75/100
3 category wins1 category wins

Public leaderboard positions: DeepSeek V4 Flash (Max) unranked (Not scored); Gemini 3.5 Flash #33 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. DeepSeek V4 Flash (Max) and Gemini 3.5 Flash share 27 comparable benchmark results. 4 of 8 categories are comparable. 18 results are unique to DeepSeek V4 Flash (Max); 19 to Gemini 3.5 Flash.

Updated July 23, 2026
Shared results
27
DeepSeek V4 Flash (Max) only
18
Gemini 3.5 Flash only
19
Comparable categories
4 / 8

Treat this as a split decision. DeepSeek V4 Flash (Max) makes more sense if mathematics is the priority or you want the cheaper token bill; Gemini 3.5 Flash is the better fit if agentic is the priority.

Confidence note. This is a partial-evidence comparison with 27 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

DeepSeek V4 Flash (Max) and Gemini 3.5 Flash 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.

Gemini 3.5 Flash is also the more expensive model on tokens at $1.50 input / $9.00 output per 1M tokens, versus $0.14 input / $0.28 output per 1M tokens for DeepSeek V4 Flash (Max). That is roughly 32.1x 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 DeepSeek V4 Flash (Max) and Gemini 3.5 Flash
CategoryDeepSeek V4 Flash (Max)ΔGemini 3.5 Flash
MathDeepSeek V4 Flash (Max)94.8Margin← 61.9Gemini 3.5 Flash32.9
CodingDeepSeek V4 Flash (Max)68.8Margin← 14.9Gemini 3.5 Flash53.9
AgenticDeepSeek V4 Flash (Max)63.8Margin→ 13.4Gemini 3.5 Flash77.2
KnowledgeDeepSeek V4 Flash (Max)55.3Margin← 8.1Gemini 3.5 Flash47.2
ReasoningDeepSeek V4 Flash (Max)Not measuredMarginNo overlapGemini 3.5 Flash74.7
MultimodalDeepSeek V4 Flash (Max)Not measuredMarginNo overlapGemini 3.5 Flash83.8
Inst. FollowingDeepSeek V4 Flash (Max)Not measuredMarginNo overlapGemini 3.5 Flash76.3

Decisive benchmark drivers

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

More
A · DeepSeek V4 Flash (Max)B · Gemini 3.5 Flash

  1. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 56.9%B 76.2%
    Winner: Gemini 3.5 FlashΔ 19.3
    Terminal-Bench 2.0: DeepSeek V4 Flash (Max) scored 56.9%; Gemini 3.5 Flash scored 76.2%. Gemini 3.5 Flash wins this benchmark.

  2. HLE

    Knowledge
    Source ↗
    A 34.8%B 40.2%
    Winner: Gemini 3.5 FlashΔ 5.4
    HLE: DeepSeek V4 Flash (Max) scored 34.8%; Gemini 3.5 Flash scored 40.2%. Gemini 3.5 Flash wins this benchmark.

  3. GPQA

    Knowledge
    Source ↗
    A 88.1%B 92.2%
    Winner: Gemini 3.5 FlashΔ 4.1
    GPQA: DeepSeek V4 Flash (Max) scored 88.1%; Gemini 3.5 Flash scored 92.2%. Gemini 3.5 Flash wins this benchmark.

  4. SWE-bench Pro

    Coding
    Source ↗
    A 52.6%B 55.1%
    Winner: Gemini 3.5 FlashΔ 2.5
    SWE-bench Pro: DeepSeek V4 Flash (Max) scored 52.6%; Gemini 3.5 Flash scored 55.1%. Gemini 3.5 Flash wins this benchmark.

Operational comparison

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

MetricDeepSeek V4 Flash (Max)Gemini 3.5 FlashComparison
Input / output priceUSD per 1M tokensDeepSeek V4 Flash (Max)$0.14 input / $0.28 outputGemini 3.5 Flash$1.5 input / $9 outputDeepSeek V4 Flash (Max) has the lower combined listed price.
Generation speedtokens per secondDeepSeek V4 Flash (Max)Not availableGemini 3.5 Flash284.2 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenDeepSeek V4 Flash (Max)Not availableGemini 3.5 Flash18.55 sA complete latency comparison is not available.
Context windowmaximum listed tokensDeepSeek V4 Flash (Max)1MGemini 3.5 Flash1MListed context windows are equal.

Benchmark Deep Dive

AgenticGemini 3.5 Flash wins
BenchmarkDeepSeek V4 Flash (Max)Gemini 3.5 FlashResult
Terminal-Bench 2.0Source 56.9%76.2%Gemini 3.5 Flash leads
BrowseCompSource 73.2%—Not comparable
HLE w/ toolsSource 45.1%—Not comparable
MCP AtlasSource 69%83.6%Gemini 3.5 Flash leads
GDPval-AASource 11891349Gemini 3.5 Flash leads
ToolathlonSource 47.8%56.5%Gemini 3.5 Flash leads
AA Agentic IndexSource 31.1%37.5%Gemini 3.5 Flash leads
τ²-bench resultsSource 95%95.3%Gemini 3.5 Flash leads
GDPval-AASource 34.4%42.4%Gemini 3.5 Flash leads
AA BriefcaseSource 831—Not comparable
AA EnterpriseOps-GymSource 39.6%50.1%Gemini 3.5 Flash leads
AA Harvey LABSource 81.3%—Not comparable
AA ITBenchSource 31.5%—Not comparable
AA Tau3 BankingSource 22.9%—Not comparable
terminalBenchHardSource 35.6%40.9%Gemini 3.5 Flash leads
OSWorld-VerifiedSource —78.4%Not comparable
Finance Agent v2Source —57.9%Not comparable
APEX-Agents-AASource —47.1%Not comparable
Gert LabsSource —61.85%Not comparable
ResearchClawBenchSource —18.0%Not comparable
AA AutomationBenchSource —42.6%Not comparable
CodingDeepSeek V4 Flash (Max) wins
BenchmarkDeepSeek V4 Flash (Max)Gemini 3.5 FlashResult
CodeforcesSource 3052.0—Not comparable
SWE-bench VerifiedSource 79%—Not comparable
SWE-bench ProSource 52.6%55.1%Gemini 3.5 Flash leads
SWE MultilingualSource 73.3%—Not comparable
Terminal-Bench 2.0Source 56.9%76.2%Gemini 3.5 Flash leads
AA Coding IndexSource 56.2%70.1%Gemini 3.5 Flash leads
AA-SciCodeSource 44.9%53.1%Gemini 3.5 Flash leads
SciCodeSource —53.1%Not comparable
Vibe Code BenchSource —48.68%Not comparable
cursorBench31Source —49.8%Not comparable
cursorBench32Source —48.8%Not comparable
Reasoning
BenchmarkDeepSeek V4 Flash (Max)Gemini 3.5 FlashResult
MRCR 1MSource 78.7%26.6%DeepSeek V4 Flash (Max) leads
CorpusQA 1MSource 60.5%—Not comparable
AA-LCRSource 63.0%69.3%Gemini 3.5 Flash leads
CritPtSource 7.1%13.1%Gemini 3.5 Flash leads
MRCRv2Source —77.3%Not comparable
ARC-AGI-2Source —72.1%Not comparable
KnowledgeDeepSeek V4 Flash (Max) wins
BenchmarkDeepSeek V4 Flash (Max)Gemini 3.5 FlashResult
MMLU-ProSource 86.2%—Not comparable
SimpleQASource 34.1%—Not comparable
Chinese-SimpleQASource 78.9%—Not comparable
GPQASource 88.1%92.2%Gemini 3.5 Flash leads
GPQA-DSource 88.1%92.7%Gemini 3.5 Flash leads
HLESource 34.8%40.2%Gemini 3.5 Flash leads
Artificial Analysis Intelligence IndexSource 40.3%50.2%Gemini 3.5 Flash leads
AA-GPQA DiamondSource 89.4%92.2%Gemini 3.5 Flash leads
AA-HLESource 32.1%41.0%Gemini 3.5 Flash leads
AA-Omniscience IndexSource -22.9%22.7%Gemini 3.5 Flash leads
AA-Omniscience AccuracySource 37.2%51.9%Gemini 3.5 Flash leads
AA-Omniscience Hallucination RateSource 95.8%60.7%Gemini 3.5 Flash leads
AA Openness IndexSource 50.0%—Not comparable
MathDeepSeek V4 Flash (Max) wins
BenchmarkDeepSeek V4 Flash (Max)Gemini 3.5 FlashResult
HMMT Feb 2026Source 94.8%—Not comparable
IMOAnswerBenchSource 88.4%—Not comparable
ApexSource 33.0%—Not comparable
Apex ShortlistSource 85.7%—Not comparable
FrontierMath v2 (Tiers 1-3)Source —38.966%Not comparable
FrontierMath v2 (Tier 4)Source —14.583%Not comparable
Multimodal
BenchmarkDeepSeek V4 Flash (Max)Gemini 3.5 FlashResult
Design Arena WebsiteSource 12381285Gemini 3.5 Flash leads
CharXivSource —84.2%Not comparable
MMMU-ProSource —83.6%Not comparable
Blueprint-Bench 2Source —33.6%Not comparable
AA-MMMU-ProSource —84.3%Not comparable
Inst. Following
BenchmarkDeepSeek V4 Flash (Max)Gemini 3.5 FlashResult
AA-IFBenchSource 79.2%76.3%DeepSeek V4 Flash (Max) leads
IFBenchSource —76.3%Not comparable
Frequently Asked Questions (5)

Which is better, DeepSeek V4 Flash (Max) or Gemini 3.5 Flash?

DeepSeek V4 Flash (Max) and Gemini 3.5 Flash 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, DeepSeek V4 Flash (Max) or Gemini 3.5 Flash?

DeepSeek V4 Flash (Max) has the edge for knowledge tasks in this comparison, averaging 55.3 versus 47.2. Inside this category, AA-Omniscience Index is the benchmark that creates the most daylight between them.

Which is better for coding, DeepSeek V4 Flash (Max) or Gemini 3.5 Flash?

DeepSeek V4 Flash (Max) has the edge for coding in this comparison, averaging 68.8 versus 53.9. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for math, DeepSeek V4 Flash (Max) or Gemini 3.5 Flash?

DeepSeek V4 Flash (Max) has the edge for math in this comparison, averaging 94.8 versus 32.9. Gemini 3.5 Flash stays close enough that the answer can still flip depending on your workload.

Which is better for agentic tasks, DeepSeek V4 Flash (Max) or Gemini 3.5 Flash?

Gemini 3.5 Flash has the edge for agentic tasks in this comparison, averaging 77.2 versus 63.8. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.

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