Noometry

Model comparison

Gemini 3.5 Flash vs Kimi K2 (Jul 2025)

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 41.2 on the Noometry Index. Kimi K2 (Jul 2025) costs 3.4× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.

Last verified . 24 shared benchmarks.

Gemini 3.5 Flash Google

54.2

Rank #32 Confirmed

Kimi K2 (Jul 2025) Moonshot AI

41.2

Rank #140 Confirmed

Summary

  • They share 24 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 8 categories and Kimi K2 (Jul 2025) in 1 category; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.8 to 23.3.
  • The biggest single-benchmark swing is SimpleBench: 76.7% for Gemini 3.5 Flash and 26.3% for Kimi K2 (Jul 2025).
  • Kimi K2 (Jul 2025) is cheaper at $0.57 / $2.30 per million input/output tokens, against $1.50 / $9 for Gemini 3.5 Flash.
  • Gemini 3.5 Flash accepts more context: 1.05M tokens versus 262K.
  • Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.

Side by side

Gemini 3.5 FlashKimi K2 (Jul 2025)
ProviderGoogleMoonshot AI
Noometry Index54.241.2
Released2026-05-192025-07-12
WeightsProprietaryOpen
Context window1.05M262K
Max output66K262K
Input $ / M tokens$1.50$0.57
Output $ / M tokens$9$2.30
Results tracked5442

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Category by category

Coding Gemini 3.5 Flash leads

Gemini 3.5 Flash: 49.4 (#49), Kimi K2 (Jul 2025): 42.4 (#102)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
WeirdML62.6%42.8%
LMArena Coding14921399
ALE-Bench911.02597.5
SWE-bench Verified79.3%—
DeepSWE37.4%—
SWE-bench Verified (bash only)—63.4%
Aider Polyglot—59.1%
LMArena WebDev1499—
SciCode53.1%—
GSO—4.9%

Agentic & Tool Use Kimi K2 (Jul 2025) leads

Gemini 3.5 Flash: 24.7 (#114), Kimi K2 (Jul 2025): 32.4 (#64)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
Terminal-Bench—35.7%
APEX-Agents27.5%—
Berkeley Function Calling Leaderboard—59.1%
GBAEval6.7%—
GDP.pdf14%—
METR Time Horizons—59.2%
Vending-Bench 25,396—

Reasoning Gemini 3.5 Flash leads

Gemini 3.5 Flash: 62.8 (#18), Kimi K2 (Jul 2025): 23.3 (#179)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
SimpleBench76.7%26.3%
LMArena Hard Prompts14881384
Epoch Capabilities Index154.46146.01
ForecastBench5960.2
ARC-AGI-272.1%—
Kagi LLM Benchmark—64.4%
NYT Connections (extended)92.6%—
ARC-AGI-192.5%—
CritPt13.1%—
Chess Puzzles50%—
EnigmaEval25.4%—
EBR-Bench4.8%—
Mystery Game Puzzles32%—
DTBench94.7%—
LMCA47.1%—
Surface Evolver Bench58.1%—

Math Gemini 3.5 Flash leads

Gemini 3.5 Flash: 60.7 (#36), Kimi K2 (Jul 2025): 42.7 (#83)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
LMArena Math15041397
FrontierMath (Feb 2025 set)39%21.4%
FrontierMath Tier 4 (v1)14.6%0%
FrontierMath (Tiers 1-3)62.8%—
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions76.3%—
OTIS Mock AIME 2024-202595.6%—
ProofBench31%—
Omni-MATH—65.4%

Knowledge Gemini 3.5 Flash leads

Gemini 3.5 Flash: 66.3 (#11), Kimi K2 (Jul 2025): 37.3 (#157)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
LMArena Expert14951365
GPQA Diamond92.8%—
SimpleQA Verified66.2%—
MMLU-Pro—81.9%
Confabulations—20.4%
Vectara Hallucination Rate—17.9%
GPQA (HELM)—65.3%

Multimodal Not comparable

Gemini 3.5 Flash: 45.7 (#15), Kimi K2 (Jul 2025): —

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
LMArena Vision1310—
Blueprint-Bench 233.6%—
LMArena Document1463—

Multilingual Gemini 3.5 Flash leads

Gemini 3.5 Flash: 57.0 (#13), Kimi K2 (Jul 2025): 49.6 (#130)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
LMArena Non-English14761372
LMArena Chinese15261415
LMArena French14901379
LMArena German14921387
LMArena Japanese14861349
LMArena Korean14511325
LMArena Russian14931385
LMArena Spanish14801386

Instruction Following Gemini 3.5 Flash leads

Gemini 3.5 Flash: 77.0 (#30), Kimi K2 (Jul 2025): 71.1 (#156)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
LMArena Instruction Following14671348
IFEval—85%

Long Context Gemini 3.5 Flash leads

Gemini 3.5 Flash: 45.4 (#38), Kimi K2 (Jul 2025): 41.2 (#145)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
LMArena Longer Query14821353
Fiction.LiveBench—66.7%
CL-bench—17.6%

Writing & Preference Gemini 3.5 Flash leads

Gemini 3.5 Flash: 65.5 (#47), Kimi K2 (Jul 2025): 62.3 (#78)

BenchmarkGemini 3.5 FlashKimi K2 (Jul 2025)
LMArena Text14821380
LMArena Creative Writing14701350
LMArena Multi-Turn14811371
Short-Story Creative Writing—85.6%
EQ-Bench Creative Writing—1666
WildBench—86.2%
EQ-Bench 41087—

Frequently asked questions

Is Gemini 3.5 Flash better than Kimi K2 (Jul 2025)?

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 41.2 on the Noometry Index. Kimi K2 (Jul 2025) costs 3.4× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.5 Flash or Kimi K2 (Jul 2025)?

Kimi K2 (Jul 2025) is cheaper. It lists at $0.57 per million input tokens and $2.30 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.

Is Gemini 3.5 Flash or Kimi K2 (Jul 2025) better for coding?

Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 42.4 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.5 Flash does, with 1.05M tokens against 262K.

How many benchmarks do Gemini 3.5 Flash and Kimi K2 (Jul 2025) share?

24 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and Kimi K2 (Jul 2025) has 42.

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