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Model comparison

Grok 3 [Beta] vs Kimi K2.5

Data verified

Head-to-head evidence from 2 shared benchmark results across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.

40.43/100
Margin
19.2pts
winning →
Kimi K2.5
Moonshot AI
59.66/100
0 category wins1 category wins

Public leaderboard positions: Grok 3 [Beta] #171 (Supported); Kimi K2.5 #54 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Grok 3 [Beta] and Kimi K2.5 share 2 comparable benchmark results. 1 of 8 categories are comparable. 0 results are unique to Grok 3 [Beta]; 61 to Kimi K2.5.

Updated July 20, 2026
Shared results
2
Grok 3 [Beta] only
0
Kimi K2.5 only
61
Comparable categories
1 / 8

Pick Kimi K2.5 if you want the stronger benchmark profile. Grok 3 [Beta] only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.

Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 1 evidence category; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Kimi K2.5 is clearly ahead on the BenchAlign aggregate, 59.66 to 40.43. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Kimi K2.5's sharpest advantage is in mathematics, where it averages 60.6 against 2.8. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 3.793% to 27.900%.

Kimi K2.5 gives you the larger context window at 256K, compared with 128K for Grok 3 [Beta].

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 Grok 3 [Beta] and Kimi K2.5
CategoryGrok 3 [Beta]ΔKimi K2.5
MathGrok 3 [Beta]2.8Margin→ 57.8Kimi K2.560.6
AgenticGrok 3 [Beta]Not measuredMarginNo overlapKimi K2.555.0
CodingGrok 3 [Beta]Not measuredMarginNo overlapKimi K2.559.4
ReasoningGrok 3 [Beta]Not measuredMarginNo overlapKimi K2.561.0
KnowledgeGrok 3 [Beta]Not measuredMarginNo overlapKimi K2.556.9
MultilingualGrok 3 [Beta]Not measuredMarginNo overlapKimi K2.582.3
MultimodalGrok 3 [Beta]Not measuredMarginNo overlapKimi K2.578.5
Inst. FollowingGrok 3 [Beta]Not measuredMarginNo overlapKimi K2.593.9

Decisive benchmark drivers

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

More
A · Grok 3 [Beta]B · Kimi K2.5

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 3.793%B 27.900%
    Winner: Kimi K2.5Δ 24.1
    FrontierMath v2 (Tiers 1-3): Grok 3 [Beta] scored 3.793%; Kimi K2.5 scored 27.900%. Kimi K2.5 wins this benchmark.

  2. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 0.000%B 4.200%
    Winner: Kimi K2.5Δ 4.2
    FrontierMath v2 (Tier 4): Grok 3 [Beta] scored 0.000%; Kimi K2.5 scored 4.200%. Kimi K2.5 wins this benchmark.

Operational comparison

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

MetricGrok 3 [Beta]Kimi K2.5Comparison
Input / output priceUSD per 1M tokensGrok 3 [Beta]Not availableKimi K2.5$0.6 input / $3 outputA complete price comparison is not available.
Generation speedtokens per secondGrok 3 [Beta]Not availableKimi K2.545 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenGrok 3 [Beta]Not availableKimi K2.52.38 sA complete latency comparison is not available.
Context windowmaximum listed tokensGrok 3 [Beta]128KKimi K2.5256KKimi K2.5 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkGrok 3 [Beta]Kimi K2.5Result
Terminal-Bench 2.0Source —50.8%Not comparable
BrowseCompSource —60.6%Not comparable
Claw-EvalSource —52.3%Not comparable
QwenClawBenchSource —54.3%Not comparable
τ³-bench resultsSource —65.7%Not comparable
DeepSearchQASource —77.1%Not comparable
DeepPlanningSource —14.4%Not comparable
ToolathlonSource —27.8%Not comparable
MCP AtlasSource —29.5%Not comparable
MCP-TasksSource —59.1%Not comparable
WideResearchSource —72.7%Not comparable
τ²-bench resultsSource —95.9%Not comparable
APEX-Agents-AASource —11.5%Not comparable
Gert LabsSource —45.88%Not comparable
ResearchClawBenchSource —14.0%Not comparable
JobBenchSource —8.7%Not comparable
AA Agentic IndexSource —21.7%Not comparable
GDPval-AASource —25.4%Not comparable
GDPval-AASource —1009Not comparable
Coding
BenchmarkGrok 3 [Beta]Kimi K2.5Result
SWE-bench VerifiedSource —76.8%Not comparable
SWE-bench Verified*Source —70.8%Not comparable
LiveCodeBench v6Source —85.0%Not comparable
SWE-bench ProSource —50.7%Not comparable
SWE MultilingualSource —73%Not comparable
SWE-RebenchSource —58.5%Not comparable
React Native EvalsSource —77.2%Not comparable
SciCodeSource —48.7%Not comparable
AA-SciCodeSource —49.0%Not comparable
AA Coding IndexSource —46.8%Not comparable
Reasoning
BenchmarkGrok 3 [Beta]Kimi K2.5Result
LongBench v2Source —61%Not comparable
AA-LCRSource —65.3%Not comparable
CritPtSource —3.1%Not comparable
Knowledge
BenchmarkGrok 3 [Beta]Kimi K2.5Result
GPQASource —87.6%Not comparable
GPQA-DSource —87.6%Not comparable
SuperGPQASource —69.2%Not comparable
MMLU-ProSource —87.1%Not comparable
MMLU-Pro (Arcee)Source —87.1%Not comparable
HLESource —30.1%Not comparable
Artificial Analysis Intelligence IndexSource —35.4%Not comparable
AA-GPQA DiamondSource —87.9%Not comparable
AA-HLESource —29.4%Not comparable
AA-Omniscience IndexSource —-8.1%Not comparable
AA-Omniscience AccuracySource —34.3%Not comparable
AA-Omniscience Hallucination RateSource —64.6%Not comparable
MathKimi K2.5 wins
BenchmarkGrok 3 [Beta]Kimi K2.5Result
FrontierMath v2 (Tiers 1-3)Source 3.793%27.900%Kimi K2.5 leads
FrontierMath v2 (Tier 4)Source 0.000%4.200%Kimi K2.5 leads
AIME 2025Source —96.1%Not comparable
AIME26Source —95.8%Not comparable
AIME25 (Arcee)Source —96.3%Not comparable
HMMT Feb 2025Source —95.4%Not comparable
HMMT Nov 2025Source —91.1%Not comparable
HMMT Feb 2026Source —87.1%Not comparable
MMAnswerBenchSource —81.8%Not comparable
Multilingual
BenchmarkGrok 3 [Beta]Kimi K2.5Result
MMLU-ProXSource —82.3%Not comparable
NOVA-63Source —56.0%Not comparable
Multimodal
BenchmarkGrok 3 [Beta]Kimi K2.5Result
MMMU-ProSource —78.5%Not comparable
Video-MMESource —87.4%Not comparable
MMVUSource —80.4%Not comparable
VideoMMMUSource —86.6%Not comparable
AA-MMMU-ProSource —75.4%Not comparable
Design Arena WebsiteSource —1282Not comparable
Inst. Following
BenchmarkGrok 3 [Beta]Kimi K2.5Result
IFEvalSource —93.9%Not comparable
AA-IFBenchSource —70.2%Not comparable
Frequently Asked Questions (2)

Which is better, Grok 3 [Beta] or Kimi K2.5?

Kimi K2.5 is ahead on BenchLM's BenchAlign leaderboard, 59.66 to 40.43. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 3.793% and 27.900%.

Which is better for math, Grok 3 [Beta] or Kimi K2.5?

Kimi K2.5 has the edge for math in this comparison, averaging 60.6 versus 2.8. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

Self-host vs API cost

Estimates at 50,000 req/day · 1000 tokens/req average.

Grok 3 [Beta]
API / mo$0
Self-host / moNot listed
Break-even—
Proprietary model — self-hosting not applicable.
Kimi K2.5
API / mo$2,700
Self-host / mo$5,221
Break-even132M/day
Model the full break-even

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