Pairwise benchmark snapshot · Aug 16, 2026
In this head-to-head showdown, Seed 2.1 Turbo delivers higher overall intelligence and human-preferred responses (Elo 1,472 vs 1,420), while Seed 2.1 Turbo leads in SWE-bench software engineering benchmarks (63.2%), while Kimi Chat 1.5 is more budget-friendly at $0.8/1M per 1M output tokens, while Seed 2.1 Turbo provides faster response streaming (160 tok/s). 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.
ByteDance Seed 2.1 Turbo, listed on public model timelines as an Aug 10 2026 API drop.
Currently comparing Kimi Chat 1.5 vs Seed 2.1 Turbo. Alternative family tiers available.
Δ 52 Arena Elo pts
160 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 | Seed 2.1 Turbo | Advantage Delta |
|---|---|---|---|
| Preference Elo | +52 | ||
| Coding Elo | +90 | ||
| LiveBench | +6.8% | ||
| SWE-bench | +12.2% | ||
| GPQA Diamond | +5.3% | ||
| Time to first token | +90 ms | ||
| Output speed | 95 tok/s | 160 tok/s | +65 tok/s |
| Input price | $0.2/1M | $0.27/1M | +$0.07/1M |
| Output price | $0.8/1M | +$0.3/1M | |
| Context window | +1.7M |
Simulate monthly production API costs in USD (US Dollar).
Kimi Chat 1.5 is estimated to save $6.95/month ($83/year).
Higher SWE-bench (63.2%).
Lower output list price ($0.8/1M).
Lower TTFT (120 ms).
Larger window (2M).
Seed 2.1 Turbo is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Seed 2.1 Turbo | Higher SWE-bench (63.2%). |
| High-volume chat | Kimi Chat 1.5 | Lower output list price ($0.8/1M). |
| Voice / low-latency UI | Seed 2.1 Turbo | Lower TTFT (120 ms). |
| Long-document RAG | Kimi Chat 1.5 | Larger window (2M). |
| Screenshots / vision | Seed 2.1 Turbo | Seed 2.1 Turbo is the side marked multimodal in the catalog. |
No comments posted on this matchup yet. Be the first to share an evaluation note!
Dynamic OpenGraph banner generated at /compare/kimi-1-5-long-vs-seed-2-1-turbo/opengraph-image
Verified Head-to-Head Telemetry
