Pairwise benchmark snapshot · Aug 17, 2026
In this head-to-head showdown, Seed 2.1 Turbo delivers higher overall intelligence and human-preferred responses (Elo 1,472 vs 1,260), while Seed 2.1 Turbo leads in SWE-bench software engineering benchmarks (63.2%), while Seed 2.1 Turbo is more budget-friendly at $2.5/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
9 benchmarks evaluated across capability, speed, and cost
First million-token Gemini Pro. Baseline for 1.5 vs 2.5 vs 3.x Pro.
ByteDance Seed 2.1 Turbo, listed on public model timelines as an Aug 10 2026 API drop.
Δ 212 Arena Elo pts
160 tok/s
$2.5 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Comparing top standard models across 6 key capability 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 | Gemini 1.5 Pro | Seed 2.1 Turbo | Advantage Delta |
|---|---|---|---|
| Preference Elo | +212 | ||
| Coding Elo | — | — | |
| LiveBench | +15.6% | ||
| SWE-bench | +25.2% | ||
| GPQA Diamond | +18.8% | ||
| Time to first token | +120 ms | ||
| Output speed | 70 tok/s | 160 tok/s | +90 tok/s |
| Input price | $1.25/1M | $0.5/1M | +$0.75/1M |
| Output price | $2.5/1M | +$2.5/1M | |
| Context window | +1.7M |
Simulate monthly production API costs in USD (US Dollar).
Seed 2.1 Turbo is estimated to save $63.75/month ($765/year).
Higher SWE-bench (63.2%).
Lower output list price ($2.5/1M).
Lower TTFT (120 ms).
Larger window (2M).
Both accept images. Defaulting to the higher-Elo side (Seed 2.1 Turbo).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Seed 2.1 Turbo | Higher SWE-bench (63.2%). |
| High-volume chat | Seed 2.1 Turbo | Lower output list price ($2.5/1M). |
| Voice / low-latency UI | Seed 2.1 Turbo | Lower TTFT (120 ms). |
| Long-document RAG | Gemini 1.5 Pro | Larger window (2M). |
| Screenshots / vision | Seed 2.1 Turbo | Both accept images. Defaulting to the higher-Elo side (Seed 2.1 Turbo). |
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