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© 2026 CompareLLM. Public benchmark data aggregated from Arena Elo, LiveBench, SWE-bench & OpenRouter.

Every score has a dated snapshot.

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  3. MoonshotAI: Kimi K2 Thinking vs Kimi K3

Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)

MoonshotAI: Kimi K2 Thinking vs Kimi K3 benchmark

In this head-to-head showdown, MoonshotAI: Kimi K2 Thinking is more budget-friendly at $2.5/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.

Executive Comparison Verdict

Bottom Line: Both MoonshotAI: Kimi K2 Thinking and Kimi K3 present distinct architectural strengths. Compare the verified benchmark matrix below to choose the model tailored to your specific application requirements.
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Moonshot
MoonshotAI: Kimi K2 Thinking

Auto-discovered from OpenRouter (moonshotai/kimi-k2-thinking). Preview until a second source matches.

$2.5/1M out
Moonshot
Kimi K3

Moonshot AI frontier flagship reasoning and agent swarm model with 256k context and top-tier SWE-bench coding capability.

Elo 1,528$15/1M out

Kimi K3 Thinking Depth & Cost Scaler

Simulate accuracy gains vs added response time & token cost

Mode: Medium (Deep Reasoning)

Reasoning models “think before answering” by generating internal reasoning tokens. Higher effort improves math, coding, and logic accuracy, but increases response delay and token costs.

Thinking Delay
290 ms
Standard speed
Reasoning Depth
~2,500
Internal tokens
Cost / 1k Calls
$43.50
7.3× standard bill
Accuracy Boost
+5.5% accuracy
STEM & SWE-bench
Top Rival Showdowns for MoonshotAI: Kimi K2 Thinking
All Matchups
Compare vs:vs Claude Opus 4.5vs GPT-5vs Gemini 3 Provs Grok 4.6vs DeepSeek V4 Pro
Preference Leader

No shared data

Single model data

Throughput Leader

No shared data

No latency data

Value per Dollar Leader

MoonshotAI: Kimi K2 Thinking

$2.5 / 1M output

Capability Percentiles

Relative percentile scores computed across all active models in the benchmark catalog.

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect
Percentile 0–100
Dimensional AdvantageKimi K3 5/6
Head-to-Head Comparison

Overall Matchup Breakdown

Category wins across reasoning intelligence, generation speed, and token cost.

MoonshotAI: Kimi K2 Thinking (2)vsKimi K3 (8)
MoonshotAI: Kimi K2 Thinking: 2W (20%)Overall: Kimi K3Kimi K3: 8W (80%)
← MoonshotAI: Kimi K2 ThinkingKimi K3 →
Kimi K3 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo
—vs1,528
Coding Elo
—vs1,535
SWE-bench
—vs73.8%
LiveBench
—vs69.5%
GPQA Diamond
—vs88.4%
MoonshotAI: Kimi K2 Thinking: 0WKimi K3: 5W
Kimi K3 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed
—vs68 tok/s
Time to first token
—vs290 ms
MoonshotAI: Kimi K2 Thinking: 0WKimi K3: 2W
MoonshotAI: Kimi K2 Thinking (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price
$2.5/1Mvs$15/1M
Input price
$0.6/1Mvs$3/1M
Context window
262kvs1M
MoonshotAI: Kimi K2 Thinking: 2WKimi K3: 1W

Side-by-Side Benchmark Matrix

Preference Elo
MoonshotAI: Kimi K2 Thinking—
Kimi K31,528
lmarena · Aug 17, 2026
Coding Elo
MoonshotAI: Kimi K2 Thinking—
Kimi K31,535
lmarena · Aug 17, 2026
LiveBench
MoonshotAI: Kimi K2 Thinking—
Kimi K369.5%
livebench · Aug 17, 2026
SWE-bench
MoonshotAI: Kimi K2 Thinking—
Kimi K373.8%
swebench · Aug 17, 2026
GPQA Diamond
MoonshotAI: Kimi K2 Thinking—
Kimi K388.4%
seed-bootstrap · Aug 1, 2026
Time to first token
MoonshotAI: Kimi K2 Thinking—
Kimi K3290 ms
seed-bootstrap · Aug 1, 2026
Output speed
MoonshotAI: Kimi K2 Thinking—
Kimi K368 tok/s
seed-bootstrap · Aug 1, 2026
Input priceMoonshotAI: Kimi K2 Thinking (+$2.4/1M)
MoonshotAI: Kimi K2 Thinking$0.6/1M
openrouter · Aug 17, 2026
Kimi K3$3/1M
openrouter · Aug 17, 2026
Output priceMoonshotAI: Kimi K2 Thinking (+$12.5/1M)
MoonshotAI: Kimi K2 Thinking$2.5/1M
openrouter · Aug 17, 2026
Kimi K3$15/1M
openrouter · Aug 17, 2026
Context windowKimi K3 (+786k)
MoonshotAI: Kimi K2 Thinking262k
openrouter · Aug 17, 2026
Kimi K31M
openrouter · Aug 17, 2026
BenchmarkMoonshotAI: Kimi K2 ThinkingKimi K3Advantage Delta
Preference Elo—
1,528
lmarena · Aug 17, 2026
—
Coding Elo—
1,535
lmarena · Aug 17, 2026
—
LiveBench—
69.5%
livebench · Aug 17, 2026
—
SWE-bench—
73.8%
swebench · Aug 17, 2026
—
GPQA Diamond—
88.4%
seed-bootstrap · Aug 1, 2026
—
Time to first token—
290 ms
seed-bootstrap · Aug 1, 2026
—
Output speed—
68 tok/s
seed-bootstrap · Aug 1, 2026
—
Input price
$0.6/1M
openrouter · Aug 17, 2026
$3/1M
openrouter · Aug 17, 2026
MoonshotAI: Kimi K2 Thinking (+$2.4/1M)
Output price
$2.5/1M
openrouter · Aug 17, 2026
$15/1M
openrouter · Aug 17, 2026
MoonshotAI: Kimi K2 Thinking (+$12.5/1M)
Context window
262k
openrouter · Aug 17, 2026
1M
openrouter · Aug 17, 2026
Kimi K3 (+786k)
Interactive Simulator (USD)

Workload Cost & Savings Calculator

Simulate monthly production API costs in USD (US Dollar).

Save up to 82% with MoonshotAI: Kimi K2 Thinking
Monthly Volume50M tokens/mo
Quick Presets:
Token Ratio (In vs Out)70% In / 30% Out
RAG / Search (10% out)Coding / Chat (50% out)
MoonshotAI: Kimi K2 Thinking$58.50 / mo
In: $21Out: $37.5
Kimi K3$330.00 / mo
In: $105Out: $225
Estimated Cost Delta

MoonshotAI: Kimi K2 Thinking is estimated to save $271.50/month ($3,258/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

  • 1
    MoonshotAI: Kimi K2 Thinking:Pick MoonshotAI: Kimi K2 Thinking when you are optimizing output cost.
  • 2
    Kimi K3:Pick Kimi K3 for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatMoonshotAI: Kimi K2 Thinking

Lower output list price ($2.5/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGKimi K3

Larger window (1M).

Screenshots / visionKimi K3

Kimi K3 is the side marked multimodal in the catalog.

Target WorkloadRecommended PickEvaluation Rationale
Repo / coding agentsinsufficient dataNeed SWE-bench on both sides.
High-volume chatMoonshotAI: Kimi K2 ThinkingLower output list price ($2.5/1M).
Voice / low-latency UIinsufficient dataNeed TTFT on both sides.
Long-document RAGKimi K3Larger window (1M).
Screenshots / visionKimi K3Kimi K3 is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news
launchJun 8, 2026

Kimi K3: Moonshot’s long-context open-weight competitive row

Jun 2026. The Kimi vs GPT hub remaps to the top Moonshot Elo vs top OpenAI Elo.

Community Sentiment

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CompareLLM Matrix

Verified head-to-head card

LIVE
VS
Moonshot

MoonshotAI: Kimi K2 Thinking

Elo n/a
LiveBench—
SWE-bench—
Speed—
Output cost$2.5/1M
Moonshot

Kimi K3

Elo 1,528
LiveBench69.5%
SWE-bench73.8%
Speed68 tok/s
Output cost$15/1M

Frequently Asked Questions

Which is better overall, MoonshotAI: Kimi K2 Thinking or Kimi K3?
We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.
Which is better at coding, MoonshotAI: Kimi K2 Thinking or Kimi K3?
SWE-bench is missing for at least one model, so we do not rank coding from a single number.
Which is cheaper to run in production?
MoonshotAI: Kimi K2 Thinking output tokens are $2.5/1M versus $15/1M. Input prices and retry rates still move the real bill.
Which is faster, MoonshotAI: Kimi K2 Thinking or Kimi K3?
We do not have TTFT for both models.
Which has the larger context window?
Kimi K3 accepts 1M tokens versus 262k.
Can I self-host either model?
Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?
No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?
Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. MoonshotAI: Kimi K2 Thinking and Kimi K3 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Related news

  • launch · Jun 8, 2026

    Kimi K3: Moonshot’s long-context open-weight competitive row

Similar Head-to-Head Comparisons

All MoonshotAI: Kimi K2 Thinking matchups →|All Kimi K3 matchups →
Kimi K3 vs MoonshotAI: Kimi K2.5 (previous kimi)MoonshotAI: Kimi K2 0711 vs Kimi K3Kimi Chat 1.5 vs Kimi K3Claude Opus 4.5 vs Kimi K3Claude Opus 4.6 vs Kimi K3Claude Sonnet 4.5 vs Kimi K3