Pairwise benchmark snapshot · Aug 1, 2026
In this head-to-head showdown, Kimi Chat 1.5 delivers higher overall intelligence and human-preferred responses (Elo 1,420 vs 1,370), while Llama 3.1 405B leads in SWE-bench software engineering benchmarks (58.4%), while Kimi Chat 1.5 is more budget-friendly at $0.8/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
10 direct benchmark disciplines evaluated across capability, speed, and cost
Moonshot ultra-long context model supporting up to 2 million tokens per request.
Meta flagship open-weight 405B dense foundation model with 128k context window.
Currently comparing Kimi Chat 1.5 vs Llama 3.1 405B. Alternative family tiers available.
Δ 50 Arena Elo pts
95 tok/s
$0.8 / 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 | Kimi Chat 1.5 | Llama 3.1 405B | Advantage Delta |
|---|---|---|---|
| Preference Elo | +50 | ||
| Coding Elo | +5 | ||
| LiveBench | +3.2% | ||
| SWE-bench | +7.4% | ||
| GPQA Diamond | +3.7% | ||
| Time to first token | +150 ms | ||
| Output speed | 95 tok/s | 42 tok/s | +53 tok/s |
| Input price | $0.2/1M | $1.25/1M | +$1.05/1M |
| Output price | $0.8/1M | $3.5/1M | +$2.7/1M |
| Context window | +1.9M |
Simulate monthly production API costs in USD (US Dollar).
Kimi Chat 1.5 is estimated to save $77.25/month ($927/year).
Higher SWE-bench (58.4%).
Lower output list price ($0.8/1M).
Lower TTFT (210 ms).
Larger window (2M).
Kimi Chat 1.5 is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Llama 3.1 405B | Higher SWE-bench (58.4%). |
| High-volume chat | Kimi Chat 1.5 | Lower output list price ($0.8/1M). |
| Voice / low-latency UI | Kimi Chat 1.5 | Lower TTFT (210 ms). |
| Long-document RAG | Kimi Chat 1.5 | Larger window (2M). |
| Screenshots / vision | Kimi Chat 1.5 | Kimi Chat 1.5 is the side marked multimodal in the catalog. |
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Verified Head-to-Head Telemetry