Pairwise benchmark snapshot · Aug 16, 2026

GPT-5.6 Sol vs MoonshotAI: Kimi K2.5 benchmark

Name: GPT-5.6 Sol vs MoonshotAI: Kimi K2.5 AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares GPT-5.6 Sol (OpenAI) and MoonshotAI: Kimi K2.5 (Moonshot) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, GPT-5.6 Sol is ahead by 93 points (1,608 vs 1,515; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, GPT-5.6 Sol resolves 77.6% versus 71.3% (seed-bootstrap (Aug 16, 2026)). GPT-5.6 Sol streams faster (84 tok/s) while MoonshotAI: Kimi K2.5 is the cheaper output token ($2.85/1M). GPT-5.6 Sol has the larger context window (1.1M 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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OpenAI

GPT-5.6 Sol

OpenAI 5.6 flagship tier. Official API $5/$30 per 1M tokens (OpenAI pricing, Jul 30 2026 update left Sol unchanged).

Elo 1,608$30/1M 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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Model A

Model B

Quick vs:vs Claude Opus 4.5 vs Claude Opus 4.6 vs Claude Sonnet 4.5 vs Claude 3.7 Sonnet

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

GPT-5.6 Sol (6)vsMoonshotAI: Kimi K2.5 (3)

GPT-5.6 Sol: 6W (67%)Overall: GPT-5.6 SolMoonshotAI: Kimi K2.5: 3W (33%)

← GPT-5.6 Sol1 tiesMoonshotAI: Kimi K2.5 →

GPT-5.6 Sol (4/5)

Intelligence & Reasoning

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

Preference Elo

1,608vs1,515

Coding Elo

1,602vs1,520

SWE-bench

77.6%vs71.3%

LiveBench

73.9%vs67.2%

GPQA Diamond

86.8%vs87.6%

GPT-5.6 Sol: 4WMoonshotAI: Kimi K2.5: 1W

GPT-5.6 Sol (1/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

84 tok/svs72 tok/s

Time to first token

270 msvs270 ms

GPT-5.6 Sol: 1WMoonshotAI: Kimi K2.5: 0W

MoonshotAI: Kimi K2.5 (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$30/1Mvs$2.85/1M

Input price

$5/1Mvs$0.57/1M

Context window

1.1Mvs262k

GPT-5.6 Sol: 1WMoonshotAI: Kimi K2.5: 2W

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 AdvantageGPT-5.6 Sol 5/6

Preference Elo

GPT-5.6 Sol

93 pts advantage

Throughput Speed

GPT-5.6 Sol

12 tok/s faster

Price Efficiency

MoonshotAI: Kimi K2.5

$27.15/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+6%1,608

EloHigh is better

1,515

Code Elo

High is better

+5%1,602

Code EloHigh is better

1,520

LiveBench

High is better

+10%73.9%

LiveBenchHigh is better

67.2%

SWE-bench

High is better

+9%77.6%

SWE-benchHigh is better

71.3%

GPQA

High is better

86.8%

GPQAHigh is better

87.6%+1%

TTFT

Low is better

270 ms

TTFTLow is better

270 ms

Speed

High is better

+17%84 tok/s

SpeedHigh is better

72 tok/s

In $

Low is better

$5/1M

In $Low is better

$0.57/1M+777%

Out $

Low is better

$30/1M

Out $Low is better

$2.85/1M+953%

Context

High is better

+301%1.1M

ContextHigh is better

262k

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 90% 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)

GPT-5.6 Sol$625.00 / mo

In: $175.00Out: $450.00

MoonshotAI: Kimi K2.5$62.70 / mo

In: $19.95Out: $42.75

Estimated Cost Delta

MoonshotAI: Kimi K2.5 is estimated to save $562.30/month ($6,748/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
GPT-5.6 Sol:Pick GPT-5.6 Sol 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
GPT-5.6 Sol:Pick GPT-5.6 Sol when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsGPT-5.6 Sol

Higher SWE-bench (77.6%).

High-volume chatMoonshotAI: Kimi K2.5

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

Voice / low-latency UIGPT-5.6 Sol

Lower TTFT (270 ms).

Long-document RAGGPT-5.6 Sol

Larger window (1.1M).

Screenshots / visionGPT-5.6 Sol

Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Sol).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	GPT-5.6 Sol	Higher SWE-bench (77.6%).
High-volume chat	MoonshotAI: Kimi K2.5	Lower output list price ($2.85/1M).
Voice / low-latency UI	GPT-5.6 Sol	Lower TTFT (270 ms).
Long-document RAG	GPT-5.6 Sol	Larger window (1.1M).
Screenshots / vision	GPT-5.6 Sol	Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Sol).

Related Editorial Dispatches & Benchmark Notes

View all news

compareAug 12, 2026

Grok vs ChatGPT: price and Elo, not a personality contest

Brand hub remaps to top xAI vs top OpenAI. After Aug 12 that is Grok 4.6 vs Sol.

compareJul 24, 2026

Claude vs GPT benchmark: this hub always remaps to the current Elo leaders

Not a frozen 2025 article. Today that is usually Opus 5 vs GPT-5.6 Sol. Dated cells, not a brand fight.

compareJul 16, 2026

Gemini vs GPT: long context versus the OpenAI flagship invoice

Hub remaps to top Google vs top OpenAI Elo. Usually 3.6 Pro vs Sol. Window vs price is the plot.

launchJul 9, 2026

GPT-5.6 Sol: OpenAI’s $5/$30 flagship tier on this leaderboard

Jul 9 2026 family; Jul 30 price update left Sol unchanged. This is the GPT side of Claude vs GPT.

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LIVE

OpenAI

GPT-5.6 Sol

Elo 1,608

LiveBench73.9%

SWE-bench77.6%

Speed84 tok/s

Output cost$30/1M

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, GPT-5.6 Sol or MoonshotAI: Kimi K2.5?: GPT-5.6 Sol has the higher preference Elo in our latest snapshot (1,608). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, GPT-5.6 Sol or MoonshotAI: Kimi K2.5?: GPT-5.6 Sol leads SWE-bench at 77.6% 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 $30/1M. Input prices and retry rates still move the real bill.
Which is faster, GPT-5.6 Sol or MoonshotAI: Kimi K2.5?: GPT-5.6 Sol has the lower time-to-first-token (270 ms vs 270 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: GPT-5.6 Sol accepts 1.1M 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. GPT-5.6 Sol 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 GPT-5.6 Sol matchups →|All MoonshotAI: Kimi K2.5 matchups →

GPT-5.6 Sol vs GPT-5 (previous gpt-flagship)MoonshotAI: Kimi K2.5 vs MoonshotAI: Kimi K2 0711 (previous kimi)MoonshotAI: Kimi K2.5 vs Kimi K3 (next kimi)GPT-5 vs MoonshotAI: Kimi K2.5 GPT-5.6 Terra vs MoonshotAI: Kimi K2.5 GPT-4.5 Orion vs MoonshotAI: Kimi K2.5

GPT-5.6 Sol vs MoonshotAI: Kimi K2.5 benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

GPT-5.6 Sol (6)vsMoonshotAI: Kimi K2.5 (3)

GPT-5.6 Sol: 6W (67%)Overall: GPT-5.6 SolMoonshotAI: Kimi K2.5: 3W (33%)

← GPT-5.6 Sol1 tiesMoonshotAI: Kimi K2.5 →

GPT-5.6 Sol (4/5)

Intelligence & Reasoning

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

Preference Elo

1,608vs1,515

Coding Elo

1,602vs1,520

SWE-bench

77.6%vs71.3%

LiveBench

73.9%vs67.2%

GPQA Diamond

86.8%vs87.6%

GPT-5.6 Sol: 4WMoonshotAI: Kimi K2.5: 1W

GPT-5.6 Sol (1/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

84 tok/svs72 tok/s

Time to first token

270 msvs270 ms

GPT-5.6 Sol: 1WMoonshotAI: Kimi K2.5: 0W

MoonshotAI: Kimi K2.5 (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$30/1Mvs$2.85/1M

Input price

$5/1Mvs$0.57/1M

Context window

1.1Mvs262k

GPT-5.6 Sol: 1WMoonshotAI: Kimi K2.5: 2W

Recommended Workload Routing

Repo / coding agentsGPT-5.6 Sol

Higher SWE-bench (77.6%).

High-volume chatMoonshotAI: Kimi K2.5

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

Voice / low-latency UIGPT-5.6 Sol

Lower TTFT (270 ms).

Long-document RAGGPT-5.6 Sol

Larger window (1.1M).

Screenshots / visionGPT-5.6 Sol

Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Sol).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	GPT-5.6 Sol	Higher SWE-bench (77.6%).
High-volume chat	MoonshotAI: Kimi K2.5	Lower output list price ($2.85/1M).
Voice / low-latency UI	GPT-5.6 Sol	Lower TTFT (270 ms).
Long-document RAG	GPT-5.6 Sol	Larger window (1.1M).
Screenshots / vision	GPT-5.6 Sol	Both accept images. Defaulting to the higher-Elo side (GPT-5.6 Sol).

Frequently Asked Questions

Which is better overall, GPT-5.6 Sol or MoonshotAI: Kimi K2.5?

GPT-5.6 Sol has the higher preference Elo in our latest snapshot (1,608). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, GPT-5.6 Sol or MoonshotAI: Kimi K2.5?

GPT-5.6 Sol leads SWE-bench at 77.6% 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 $30/1M. Input prices and retry rates still move the real bill.

Which is faster, GPT-5.6 Sol or MoonshotAI: Kimi K2.5?

GPT-5.6 Sol has the lower time-to-first-token (270 ms vs 270 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

GPT-5.6 Sol accepts 1.1M 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. GPT-5.6 Sol 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

GPT-5.6 Sol

GPT-5.6 Sol

MoonshotAI: Kimi K2.5

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Grok vs ChatGPT: price and Elo, not a personality contest

Claude vs GPT benchmark: this hub always remaps to the current Elo leaders

Gemini vs GPT: long context versus the OpenAI flagship invoice

GPT-5.6 Sol: OpenAI’s $5/$30 flagship tier on this leaderboard

Cast Your Matchup Vote

Community Discussions (0)

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CompareLLM Matrix

GPT-5.6 Sol

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

GPT-5.6 Sol

GPT-5.6 Sol

MoonshotAI: Kimi K2.5

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Grok vs ChatGPT: price and Elo, not a personality contest

Claude vs GPT benchmark: this hub always remaps to the current Elo leaders

Gemini vs GPT: long context versus the OpenAI flagship invoice

GPT-5.6 Sol: OpenAI’s $5/$30 flagship tier on this leaderboard

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

GPT-5.6 Sol

MoonshotAI: Kimi K2.5

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons