Pairwise benchmark snapshot · Aug 16, 2026

Claude Opus 4.5 vs MoonshotAI: Kimi K2.5 benchmark

Name: Claude Opus 4.5 vs MoonshotAI: Kimi K2.5 AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Claude Opus 4.5 (Anthropic) and MoonshotAI: Kimi K2.5 (Moonshot) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Opus 4.5 is ahead by 53 points (1,568 vs 1,515; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, Claude Opus 4.5 resolves 76.8% versus 71.3% (seed-bootstrap (Aug 1, 2026)). MoonshotAI: Kimi K2.5 streams faster (72 tok/s) while MoonshotAI: Kimi K2.5 is the cheaper output token ($2.85/1M). MoonshotAI: Kimi K2.5 has the larger context window (262k tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.

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Anthropic

Claude Opus 4.5

Anthropic frontier coding and computer-use model. SWE-bench leader on the official mini-SWE-agent harness in the Feb 2026 refresh.

Elo 1,568$25/1M out

Moonshot

MoonshotAI: Kimi K2.5

Auto-discovered from OpenRouter (moonshotai/kimi-k2.5). Preview until a second source matches.

Elo 1,515$2.8499999999999996/1M out

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Quick vs:vs Claude Opus 4.6 vs Claude Sonnet 4.5 vs Claude 3.7 Sonnet vs GPT-5

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Opus 4.5 (4)vsMoonshotAI: Kimi K2.5 (6)

Claude Opus 4.5: 4W (40%)Overall: MoonshotAI: Kimi K2.5MoonshotAI: Kimi K2.5: 6W (60%)

← Claude Opus 4.5MoonshotAI: Kimi K2.5 →

Claude Opus 4.5 (4/5)

Intelligence & Reasoning

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

Preference Elo

1,568vs1,515

Coding Elo

1,574vs1,520

SWE-bench

76.8%vs71.3%

LiveBench

71.2%vs67.2%

GPQA Diamond

84.1%vs87.6%

Claude Opus 4.5: 4WMoonshotAI: Kimi K2.5: 1W

MoonshotAI: Kimi K2.5 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

62 tok/svs72 tok/s

Time to first token

380 msvs270 ms

Claude Opus 4.5: 0WMoonshotAI: Kimi K2.5: 2W

MoonshotAI: Kimi K2.5 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$25/1Mvs$2.85/1M

Input price

$5/1Mvs$0.57/1M

Context window

200kvs262k

Claude Opus 4.5: 0WMoonshotAI: Kimi K2.5: 3W

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 AdvantageEven 3–3

Preference Elo

Claude Opus 4.5

53 pts advantage

Throughput Speed

MoonshotAI: Kimi K2.5

10 tok/s faster

Price Efficiency

MoonshotAI: Kimi K2.5

$22.15/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+3%1,568

EloHigh is better

1,515

Code Elo

High is better

+4%1,574

Code EloHigh is better

1,520

LiveBench

High is better

+6%71.2%

LiveBenchHigh is better

67.2%

SWE-bench

High is better

+8%76.8%

SWE-benchHigh is better

71.3%

GPQA

High is better

84.1%

GPQAHigh is better

87.6%+4%

TTFT

Low is better

380 ms

TTFTLow is better

270 ms+41%

Speed

High is better

62 tok/s

SpeedHigh is better

72 tok/s+16%

In $

Low is better

$5/1M

In $Low is better

$0.57/1M+777%

Out $

Low is better

$25/1M

Out $Low is better

$2.85/1M+777%

Context

High is better

200k

ContextHigh is better

262k+31%

Interactive Simulator

Workload Cost & Savings Calculator

Simulate monthly production API costs based on published $/1M tokens.

Save up to 89% with MoonshotAI: Kimi K2.5

Monthly Volume50M tokens/mo

Quick Presets:

Token Ratio (In vs Out)70% In / 30% Out

RAG / Search (10% out)Coding / Chat (50% out)

Claude Opus 4.5$550.00 / mo

In: $175.00Out: $375.00

MoonshotAI: Kimi K2.5$62.70 / mo

In: $19.95Out: $42.75

Estimated Cost Delta

MoonshotAI: Kimi K2.5 is estimated to save $487.30/month ($5,848/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Claude Opus 4.5:Pick Claude Opus 4.5 when repo-level coding accuracy is the constraint.
2
MoonshotAI: Kimi K2.5:Pick MoonshotAI: Kimi K2.5 when you are optimizing output cost.
3
MoonshotAI: Kimi K2.5:Pick MoonshotAI: Kimi K2.5 when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsClaude Opus 4.5

Higher SWE-bench (76.8%).

High-volume chatMoonshotAI: Kimi K2.5

Lower output list price ($2.85/1M).

Voice / low-latency UIMoonshotAI: Kimi K2.5

Lower TTFT (270 ms).

Long-document RAGMoonshotAI: Kimi K2.5

Larger window (262k).

Screenshots / visionClaude Opus 4.5

Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Opus 4.5	Higher SWE-bench (76.8%).
High-volume chat	MoonshotAI: Kimi K2.5	Lower output list price ($2.85/1M).
Voice / low-latency UI	MoonshotAI: Kimi K2.5	Lower TTFT (270 ms).
Long-document RAG	MoonshotAI: Kimi K2.5	Larger window (262k).
Screenshots / vision	Claude Opus 4.5	Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Related Editorial Dispatches & Benchmark Notes

View all news

launchFeb 20, 2026

Claude Opus 4.5 and the Feb 2026 SWE-bench row we still cite

The Feb refresh made 4.5 a coding reference. Newer Opus SKUs exist; this row stays as the dated harness point.

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LIVE

Anthropic

Claude Opus 4.5

Elo 1,568

LiveBench71.2%

SWE-bench76.8%

Speed62 tok/s

Output cost$25/1M

Moonshot

MoonshotAI: Kimi K2.5

Elo 1,515

LiveBench67.2%

SWE-bench71.3%

Speed72 tok/s

Output cost$2.85/1M

Frequently Asked Questions

Which is better overall, Claude Opus 4.5 or MoonshotAI: Kimi K2.5?: Claude Opus 4.5 has the higher preference Elo in our latest snapshot (1,568). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Claude Opus 4.5 or MoonshotAI: Kimi K2.5?: Claude Opus 4.5 leads SWE-bench at 76.8% vs 71.3%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: MoonshotAI: Kimi K2.5 output tokens are $2.85/1M versus $25/1M. Input prices and retry rates still move the real bill.
Which is faster, Claude Opus 4.5 or MoonshotAI: Kimi K2.5?: MoonshotAI: Kimi K2.5 has the lower time-to-first-token (270 ms vs 380 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: MoonshotAI: Kimi K2.5 accepts 262k tokens versus 200k.
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. Claude Opus 4.5 and MoonshotAI: Kimi K2.5 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Claude Opus 4.5 matchups →|All MoonshotAI: Kimi K2.5 matchups →

Claude Opus 4.5 vs Claude Opus 4 (previous opus)Claude Opus 4.5 vs Claude Opus 4.6 (next opus)MoonshotAI: Kimi K2.5 vs MoonshotAI: Kimi K2 0711 (previous kimi)MoonshotAI: Kimi K2.5 vs Kimi K3 (next kimi)Claude Sonnet 5 vs Claude Opus 4.5 Claude Opus 4.8 vs Claude Opus 4.5

Claude Opus 4.5 vs MoonshotAI: Kimi K2.5 benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Opus 4.5 (4)vsMoonshotAI: Kimi K2.5 (6)

Claude Opus 4.5: 4W (40%)Overall: MoonshotAI: Kimi K2.5MoonshotAI: Kimi K2.5: 6W (60%)

← Claude Opus 4.5MoonshotAI: Kimi K2.5 →

Claude Opus 4.5 (4/5)

Intelligence & Reasoning

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

Preference Elo

1,568vs1,515

Coding Elo

1,574vs1,520

SWE-bench

76.8%vs71.3%

LiveBench

71.2%vs67.2%

GPQA Diamond

84.1%vs87.6%

Claude Opus 4.5: 4WMoonshotAI: Kimi K2.5: 1W

MoonshotAI: Kimi K2.5 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

62 tok/svs72 tok/s

Time to first token

380 msvs270 ms

Claude Opus 4.5: 0WMoonshotAI: Kimi K2.5: 2W

MoonshotAI: Kimi K2.5 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$25/1Mvs$2.85/1M

Input price

$5/1Mvs$0.57/1M

Context window

200kvs262k

Claude Opus 4.5: 0WMoonshotAI: Kimi K2.5: 3W

Recommended Workload Routing

Repo / coding agentsClaude Opus 4.5

Higher SWE-bench (76.8%).

High-volume chatMoonshotAI: Kimi K2.5

Lower output list price ($2.85/1M).

Voice / low-latency UIMoonshotAI: Kimi K2.5

Lower TTFT (270 ms).

Long-document RAGMoonshotAI: Kimi K2.5

Larger window (262k).

Screenshots / visionClaude Opus 4.5

Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Opus 4.5	Higher SWE-bench (76.8%).
High-volume chat	MoonshotAI: Kimi K2.5	Lower output list price ($2.85/1M).
Voice / low-latency UI	MoonshotAI: Kimi K2.5	Lower TTFT (270 ms).
Long-document RAG	MoonshotAI: Kimi K2.5	Larger window (262k).
Screenshots / vision	Claude Opus 4.5	Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Frequently Asked Questions

Which is better overall, Claude Opus 4.5 or MoonshotAI: Kimi K2.5?

Claude Opus 4.5 has the higher preference Elo in our latest snapshot (1,568). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Claude Opus 4.5 or MoonshotAI: Kimi K2.5?

Claude Opus 4.5 leads SWE-bench at 76.8% vs 71.3%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

MoonshotAI: Kimi K2.5 output tokens are $2.85/1M versus $25/1M. Input prices and retry rates still move the real bill.

Which is faster, Claude Opus 4.5 or MoonshotAI: Kimi K2.5?

MoonshotAI: Kimi K2.5 has the lower time-to-first-token (270 ms vs 380 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

MoonshotAI: Kimi K2.5 accepts 262k tokens versus 200k.

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. Claude Opus 4.5 and MoonshotAI: Kimi K2.5 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Opus 4.5

MoonshotAI: Kimi K2.5

MoonshotAI: Kimi K2.5

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude Opus 4.5 and the Feb 2026 SWE-bench row we still cite

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Opus 4.5

MoonshotAI: Kimi K2.5

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Opus 4.5

MoonshotAI: Kimi K2.5

MoonshotAI: Kimi K2.5

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude Opus 4.5 and the Feb 2026 SWE-bench row we still cite

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Opus 4.5

MoonshotAI: Kimi K2.5

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons