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Model comparison

Gemini 3.5 Flash vs Kimi K3

Data verified

Head-to-head evidence from 25 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

64.75/100
Margin
16.2pts
winning →
Kimi K3
Moonshot AI
80.96/100
1 category wins2 category wins

Public leaderboard positions: Gemini 3.5 Flash #33 (Estimated); Kimi K3 #4 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Gemini 3.5 Flash and Kimi K3 share 25 comparable benchmark results. 3 of 8 categories are comparable. 21 results are unique to Gemini 3.5 Flash; 32 to Kimi K3.

Updated July 23, 2026
Shared results
25
Gemini 3.5 Flash only
21
Kimi K3 only
32
Comparable categories
3 / 8

Pick Kimi K3 if you want the stronger benchmark profile. Gemini 3.5 Flash only becomes the better choice if multimodal & grounded is the priority or you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 25 shared benchmark results across 5 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Kimi K3 is clearly ahead on the BenchAlign aggregate, 80.96 to 64.75. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Kimi K3's sharpest advantage is in knowledge, where it averages 61 against 47.2. The single biggest benchmark swing on the page is HLE, 40.2% to 56%. Gemini 3.5 Flash does hit back in multimodal & grounded, so the answer changes if that is the part of the workload you care about most.

Kimi K3 is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $1.50 input / $9.00 output per 1M tokens for Gemini 3.5 Flash. Kimi K3 gives you the larger context window at 1.05M, compared with 1M for Gemini 3.5 Flash.

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 Gemini 3.5 Flash and Kimi K3
CategoryGemini 3.5 FlashΔKimi K3
KnowledgeGemini 3.5 Flash47.2Margin→ 13.8Kimi K361.0
AgenticGemini 3.5 Flash77.2Margin→ 12.3Kimi K389.5
MultimodalGemini 3.5 Flash83.8Margin← 5.3Kimi K378.5
CodingGemini 3.5 Flash53.9MarginNo overlapKimi K3Not measured
ReasoningGemini 3.5 Flash74.7MarginNo overlapKimi K3Not measured
MathGemini 3.5 Flash32.9MarginNo overlapKimi K3Not measured
Inst. FollowingGemini 3.5 Flash76.3MarginNo overlapKimi K3Not measured

Decisive benchmark drivers

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

More
A · Gemini 3.5 FlashB · Kimi K3

  1. HLE

    Knowledge
    Source ↗
    A 40.2%B 56%
    Winner: Kimi K3Δ 15.8
    HLE: Gemini 3.5 Flash scored 40.2%; Kimi K3 scored 56%. Kimi K3 wins this benchmark.

  2. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 76.2%B 88.3%
    Winner: Kimi K3Δ 12.1
    Terminal-Bench 2.0: Gemini 3.5 Flash scored 76.2%; Kimi K3 scored 88.3%. Kimi K3 wins this benchmark.

  3. CharXiv

    Multimodal
    Source ↗
    A 84.2%B 91.3%
    Winner: Kimi K3Δ 7.1
    CharXiv: Gemini 3.5 Flash scored 84.2%; Kimi K3 scored 91.3%. Kimi K3 wins this benchmark.

  4. MMMU-Pro

    Multimodal
    Source ↗
    A 83.6%B 81.6%
    Winner: Gemini 3.5 FlashΔ 2
    MMMU-Pro: Gemini 3.5 Flash scored 83.6%; Kimi K3 scored 81.6%. Gemini 3.5 Flash wins this benchmark.

  5. GPQA

    Knowledge
    Source ↗
    A 92.2%B 93.5%
    Winner: Kimi K3Δ 1.3
    GPQA: Gemini 3.5 Flash scored 92.2%; Kimi K3 scored 93.5%. Kimi K3 wins this benchmark.

Operational comparison

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

MetricGemini 3.5 FlashKimi K3Comparison
Input / output priceUSD per 1M tokensGemini 3.5 Flash$1.5 input / $9 outputKimi K3$3 input / $15 outputGemini 3.5 Flash has the lower combined listed price.
Generation speedtokens per secondGemini 3.5 Flash284.2 tok/sKimi K3Not availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenGemini 3.5 Flash18.55 sKimi K3Not availableA complete latency comparison is not available.
Context windowmaximum listed tokensGemini 3.5 Flash1MKimi K31.05MKimi K3 lists the larger context window.

Benchmark Deep Dive

AgenticKimi K3 wins
BenchmarkGemini 3.5 FlashKimi K3Result
Terminal-Bench 2.0Source 76.2%88.3%Kimi K3 leads
MCP AtlasSource 83.6%84.2%Kimi K3 leads
ToolathlonSource 56.5%—Not comparable
OSWorld-VerifiedSource 78.4%—Not comparable
Finance Agent v2Source 57.9%—Not comparable
GDPval-AASource 13491679Kimi K3 leads
τ²-bench resultsSource 95.3%—Not comparable
GDPval-AASource 42.4%59.0%Kimi K3 leads
AA Agentic IndexSource 37.5%50.1%Kimi K3 leads
APEX-Agents-AASource 47.1%41.3%Gemini 3.5 Flash leads
Gert LabsSource 61.85%—Not comparable
ResearchClawBenchSource 18.0%—Not comparable
AA AutomationBenchSource 42.6%52.7%Kimi K3 leads
AA EnterpriseOps-GymSource 50.1%45.3%Gemini 3.5 Flash leads
terminalBenchHardSource 40.9%—Not comparable
BrowseCompSource —91.2%Not comparable
DeepSearchQASource —95.0%Not comparable
Toolathlon-VerifiedSource —73.2%Not comparable
AutomationBenchSource —30.8%Not comparable
JobBenchSource —52.9%Not comparable
APEX-AgentsSource —37.6%Not comparable
SpreadsheetBench 2Source —34.8%Not comparable
DECK-BenchSource —73.5%Not comparable
AA BriefcaseSource —1543Not comparable
AA Harvey LABSource —94.6%Not comparable
AA Tau3 BankingSource —33.4%Not comparable
aaTerminalBench21Source —85%Not comparable
AA ITBenchSource —47.7%Not comparable
Coding
BenchmarkGemini 3.5 FlashKimi K3Result
Terminal-Bench 2.0Source 76.2%—Not comparable
SWE-bench ProSource 55.1%—Not comparable
SciCodeSource 53.1%—Not comparable
Vibe Code BenchSource 48.68%—Not comparable
cursorBench31Source 49.8%—Not comparable
cursorBench32Source 48.8%—Not comparable
AA Coding IndexSource 70.1%76.2%Kimi K3 leads
AA-SciCodeSource 53.1%58.7%Kimi K3 leads
deepSweSource —67.5%Not comparable
FrontierSWESource —81.2%Not comparable
ProgramBenchSource —77.8%Not comparable
Kimi Code Bench v2Source —72.9%Not comparable
sweMarathonSource —42%Not comparable
PostTrain BenchSource —36.6%Not comparable
MLS-Bench LiteSource —48.3%Not comparable
Reasoning
BenchmarkGemini 3.5 FlashKimi K3Result
MRCRv2Source 77.3%—Not comparable
MRCR 1MSource 26.6%—Not comparable
ARC-AGI-2Source 72.1%—Not comparable
AA-LCRSource 69.3%74.7%Kimi K3 leads
CritPtSource 13.1%23.4%Kimi K3 leads
KnowledgeKimi K3 wins
BenchmarkGemini 3.5 FlashKimi K3Result
Artificial Analysis Intelligence IndexSource 50.2%57.1%Kimi K3 leads
GPQASource 92.2%93.5%Kimi K3 leads
GPQA-DSource 92.7%93.5%Kimi K3 leads
HLESource 40.2%56%Kimi K3 leads
AA-Omniscience AccuracySource 51.9%46.0%Gemini 3.5 Flash leads
AA-Omniscience Hallucination RateSource 60.7%50.9%Kimi K3 leads
AA-GPQA DiamondSource 92.2%93.5%Kimi K3 leads
AA-HLESource 41.0%44.3%Kimi K3 leads
AA-Omniscience IndexSource 22.7%18.4%Gemini 3.5 Flash leads
HLE w/o toolsSource —43.5%Not comparable
Math
BenchmarkGemini 3.5 FlashKimi K3Result
FrontierMath v2 (Tiers 1-3)Source 38.966%—Not comparable
FrontierMath v2 (Tier 4)Source 14.583%—Not comparable
MultimodalGemini 3.5 Flash wins
BenchmarkGemini 3.5 FlashKimi K3Result
CharXivSource 84.2%91.3%Kimi K3 leads
MMMU-ProSource 83.6%81.6%Gemini 3.5 Flash leads
Blueprint-Bench 2Source 33.6%—Not comparable
AA-MMMU-ProSource 84.3%80.5%Gemini 3.5 Flash leads
Design Arena WebsiteSource 12851386Kimi K3 leads
OfficeQA ProSource —63.3%Not comparable
MMMU-Pro w/ PythonSource —83.4%Not comparable
CharXiv w/o toolsSource —84.8%Not comparable
MathVisionSource —94.3%Not comparable
MathVision w/ PythonSource —97.8%Not comparable
BabyVision w/ PythonSource —85.7%Not comparable
ZeroBenchSource —23.0%Not comparable
ZeroBench w/ PythonSource —41.0%Not comparable
WorldVQA ForceAnswerSource —51.0%Not comparable
OmniDocBenchSource —91.1%Not comparable
PerceptionBenchSource —58.5%Not comparable
Inst. Following
BenchmarkGemini 3.5 FlashKimi K3Result
IFBenchSource 76.3%—Not comparable
AA-IFBenchSource 76.3%—Not comparable
Frequently Asked Questions (4)

Which is better, Gemini 3.5 Flash or Kimi K3?

Kimi K3 is ahead on BenchLM's BenchAlign leaderboard, 80.96 to 64.75. The biggest single separator in this matchup is HLE, where the scores are 40.2% and 56%.

Which is better for knowledge tasks, Gemini 3.5 Flash or Kimi K3?

Kimi K3 has the edge for knowledge tasks in this comparison, averaging 61 versus 47.2. Inside this category, HLE is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Gemini 3.5 Flash or Kimi K3?

Kimi K3 has the edge for agentic tasks in this comparison, averaging 89.5 versus 77.2. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Gemini 3.5 Flash or Kimi K3?

Gemini 3.5 Flash has the edge for multimodal and grounded tasks in this comparison, averaging 83.8 versus 78.5. Inside this category, Design Arena Website is the benchmark that creates the most daylight between them.

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