Pairwise benchmark snapshot · Aug 1, 2026
In this head-to-head showdown, GPT-4.5 Orion delivers higher overall intelligence and human-preferred responses (Elo 1,540 vs 1,515), while Kimi K2.5 Max leads in SWE-bench software engineering benchmarks (71.3%), while Kimi K2.5 Max is more budget-friendly at $2/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
9 direct benchmark disciplines evaluated across capability, speed, and cost
OpenAI largest dense non-reasoning model with expansive world knowledge and reduced hallucinations.
Moonshot flagship reasoning model with high-fidelity coding, deep thinking, and tool use across a 200k context.
Currently comparing GPT-4.5 Orion vs Kimi K2.5 Max. Alternative family tiers available.
Simulate accuracy gains vs added response time & token cost
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.
Δ 25 Arena Elo pts
72 tok/s
$2 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Comparing top Western standard models with China's leading frontier rival across 6 skill dimensions. Tap any spoke or dot to inspect.
Category wins across reasoning intelligence, generation speed, and token cost.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
| Benchmark | GPT-4.5 Orion | Kimi K2.5 Max | Advantage Delta |
|---|---|---|---|
| Preference Elo | +25 | ||
| Coding Elo | — | ||
| LiveBench | +1.3% | ||
| SWE-bench | +0.3% | ||
| GPQA Diamond | +3.6% | ||
| Time to first token | +80 ms | ||
| Output speed | 60 tok/s | 72 tok/s | +12 tok/s |
| Input price | $0.5/1M | +$74.5/1M | |
| Output price | $150/1M | +$148/1M | |
| Context window | +72k |
Simulate monthly production API costs in USD (US Dollar).
Kimi K2.5 Max is estimated to save $4,827.50/month ($57,930/year).
Higher SWE-bench (71.3%).
Lower output list price ($2/1M).
Lower TTFT (270 ms).
Larger window (200k).
Both accept images. Defaulting to the higher-Elo side (GPT-4.5 Orion).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Kimi K2.5 Max | Higher SWE-bench (71.3%). |
| High-volume chat | Kimi K2.5 Max | Lower output list price ($2/1M). |
| Voice / low-latency UI | Kimi K2.5 Max | Lower TTFT (270 ms). |
| Long-document RAG | Kimi K2.5 Max | Larger window (200k). |
| Screenshots / vision | GPT-4.5 Orion | Both accept images. Defaulting to the higher-Elo side (GPT-4.5 Orion). |
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