Pairwise benchmark snapshot · Aug 16, 2026

GPT-4.5 Orion vs Kimi K3 benchmark

Name: GPT-4.5 Orion vs Kimi K3 AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares GPT-4.5 Orion (OpenAI) and Kimi K3 (Moonshot) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, GPT-4.5 Orion is ahead by 12 points (1,540 vs 1,528; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, Kimi K3 resolves 73.8% versus 71% (seed-bootstrap (Aug 1, 2026)). Kimi K3 streams faster (68 tok/s) while Kimi K3 is the cheaper output token ($15/1M). Kimi K3 has the larger context window (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-4.5 Orion

OpenAI largest dense non-reasoning model with expansive world knowledge and reduced hallucinations.

Elo 1,540$150/1M 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

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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-4.5 Orion (1)vsKimi K3 (9)

GPT-4.5 Orion: 1W (10%)Overall: Kimi K3Kimi K3: 9W (90%)

← GPT-4.5 OrionKimi K3 →

Kimi K3 (4/5)

Intelligence & Reasoning

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

Preference Elo

1,540vs1,528

Coding Elo

1,520vs1,535

SWE-bench

71%vs73.8%

LiveBench

68.5%vs69.5%

GPQA Diamond

84%vs88.4%

GPT-4.5 Orion: 1WKimi K3: 4W

Kimi K3 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

60 tok/svs68 tok/s

Time to first token

350 msvs290 ms

GPT-4.5 Orion: 0WKimi K3: 2W

Kimi K3 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$150/1Mvs$15/1M

Input price

$75/1Mvs$3/1M

Context window

128kvs1M

GPT-4.5 Orion: 0WKimi K3: 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 AdvantageKimi K3 6/6

Preference Elo

GPT-4.5 Orion

12 pts advantage

Throughput Speed

Kimi K3

8 tok/s faster

Price Efficiency

Kimi K3

$135.00/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+1%1,540

EloHigh is better

1,528

Code Elo

High is better

1,520

Code EloHigh is better

1,535+1%

LiveBench

High is better

68.5%

LiveBenchHigh is better

69.5%+1%

SWE-bench

High is better

71%

SWE-benchHigh is better

73.8%+4%

GPQA

High is better

84%

GPQAHigh is better

88.4%+5%

TTFT

Low is better

350 ms

TTFTLow is better

290 ms+21%

Speed

High is better

60 tok/s

SpeedHigh is better

68 tok/s+13%

In $

Low is better

$75/1M

In $Low is better

$3/1M+2400%

Out $

Low is better

$150/1M

Out $Low is better

$15/1M+900%

Context

High is better

128k

ContextHigh is better

1M+719%

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 93% with Kimi K3

Monthly Volume50M tokens/mo

Quick Presets:

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

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

GPT-4.5 Orion$4,875.00 / mo

In: $2625.00Out: $2250.00

Kimi K3$330.00 / mo

In: $105.00Out: $225.00

Estimated Cost Delta

Kimi K3 is estimated to save $4,545.00/month ($54,540/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Kimi K3:Pick Kimi K3 when repo-level coding accuracy is the constraint.
2
Kimi K3:Pick Kimi K3 when time-to-first-token matters more than peak Elo.
3
Kimi K3:Pick Kimi K3 for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsKimi K3

Higher SWE-bench (73.8%).

High-volume chatKimi K3

Lower output list price ($15/1M).

Voice / low-latency UIKimi K3

Lower TTFT (290 ms).

Long-document RAGKimi K3

Larger window (1M).

Screenshots / visionGPT-4.5 Orion

Both accept images. Defaulting to the higher-Elo side (GPT-4.5 Orion).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Kimi K3	Higher SWE-bench (73.8%).
High-volume chat	Kimi K3	Lower output list price ($15/1M).
Voice / low-latency UI	Kimi K3	Lower TTFT (290 ms).
Long-document RAG	Kimi K3	Larger window (1M).
Screenshots / vision	GPT-4.5 Orion	Both accept images. Defaulting to the higher-Elo side (GPT-4.5 Orion).

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.

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LIVE

OpenAI

GPT-4.5 Orion

Elo 1,540

LiveBench68.5%

SWE-bench71%

Speed60 tok/s

Output cost$150/1M

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, GPT-4.5 Orion or Kimi K3?: GPT-4.5 Orion has the higher preference Elo in our latest snapshot (1,540). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, GPT-4.5 Orion or Kimi K3?: Kimi K3 leads SWE-bench at 73.8% vs 71%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Kimi K3 output tokens are $15/1M versus $150/1M. Input prices and retry rates still move the real bill.
Which is faster, GPT-4.5 Orion or Kimi K3?: Kimi K3 has the lower time-to-first-token (290 ms vs 350 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Kimi K3 accepts 1M tokens versus 128k.
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-4.5 Orion and Kimi K3 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All GPT-4.5 Orion matchups →|All Kimi K3 matchups →

GPT-4.5 Orion vs OpenAI: o1 (previous gpt-flagship)GPT-4.5 Orion vs GPT-5 (next gpt-flagship)Kimi K3 vs MoonshotAI: Kimi K2.5 (previous kimi)GPT-5.6 Terra vs GPT-4.5 Orion GPT-5.6 Sol vs GPT-4.5 Orion OpenAI: o3 Mini vs GPT-4.5 Orion

GPT-4.5 Orion vs Kimi K3 benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

GPT-4.5 Orion (1)vsKimi K3 (9)

GPT-4.5 Orion: 1W (10%)Overall: Kimi K3Kimi K3: 9W (90%)

← GPT-4.5 OrionKimi K3 →

Kimi K3 (4/5)

Intelligence & Reasoning

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

Preference Elo

1,540vs1,528

Coding Elo

1,520vs1,535

SWE-bench

71%vs73.8%

LiveBench

68.5%vs69.5%

GPQA Diamond

84%vs88.4%

GPT-4.5 Orion: 1WKimi K3: 4W

Kimi K3 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

60 tok/svs68 tok/s

Time to first token

350 msvs290 ms

GPT-4.5 Orion: 0WKimi K3: 2W

Kimi K3 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$150/1Mvs$15/1M

Input price

$75/1Mvs$3/1M

Context window

128kvs1M

GPT-4.5 Orion: 0WKimi K3: 3W

Recommended Workload Routing

Repo / coding agentsKimi K3

Higher SWE-bench (73.8%).

High-volume chatKimi K3

Lower output list price ($15/1M).

Voice / low-latency UIKimi K3

Lower TTFT (290 ms).

Long-document RAGKimi K3

Larger window (1M).

Screenshots / visionGPT-4.5 Orion

Both accept images. Defaulting to the higher-Elo side (GPT-4.5 Orion).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Kimi K3	Higher SWE-bench (73.8%).
High-volume chat	Kimi K3	Lower output list price ($15/1M).
Voice / low-latency UI	Kimi K3	Lower TTFT (290 ms).
Long-document RAG	Kimi K3	Larger window (1M).
Screenshots / vision	GPT-4.5 Orion	Both accept images. Defaulting to the higher-Elo side (GPT-4.5 Orion).

Frequently Asked Questions

Which is better overall, GPT-4.5 Orion or Kimi K3?

GPT-4.5 Orion has the higher preference Elo in our latest snapshot (1,540). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, GPT-4.5 Orion or Kimi K3?

Kimi K3 leads SWE-bench at 73.8% vs 71%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Kimi K3 output tokens are $15/1M versus $150/1M. Input prices and retry rates still move the real bill.

Which is faster, GPT-4.5 Orion or Kimi K3?

Kimi K3 has the lower time-to-first-token (290 ms vs 350 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Kimi K3 accepts 1M tokens versus 128k.

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-4.5 Orion and Kimi K3 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-4.5 Orion

Kimi K3

Kimi K3

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

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

Cast Your Matchup Vote

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CompareLLM Matrix

GPT-4.5 Orion

Kimi K3

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-4.5 Orion

Kimi K3

Kimi K3

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

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

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

GPT-4.5 Orion

Kimi K3

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons