Pairwise benchmark snapshot · Aug 16, 2026
In this head-to-head showdown, GPT-5.6 Terra delivers higher overall intelligence and human-preferred responses (Elo 1,548 vs 1,398), while GPT-5.6 Terra leads in SWE-bench software engineering benchmarks (70.4%), while Qwen3.8 27B is more budget-friendly at $0.4/1M 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
OpenAI 5.6 mid tier. Official API $2/$12 per 1M after the Jul 30 2026 price cut.
Alibaba open-weight 27B drop dated Aug 14 2026. Dense enough to self-host; not a frontier MoE.
Currently comparing GPT-5.6 Terra vs Qwen3.8 27B. Alternative family tiers available.
Δ 150 Arena Elo pts
152 tok/s
$0.4 / 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-5.6 Terra | Qwen3.8 27B | Advantage Delta |
|---|---|---|---|
| Preference Elo | +150 | ||
| Coding Elo | +120 | ||
| LiveBench | +8.5% | ||
| SWE-bench | +11.6% | ||
| GPQA Diamond | +8.6% | ||
| Time to first token | +20 ms | ||
| Output speed | 128 tok/s | 152 tok/s | +24 tok/s |
| Input price | +$1.9/1M | ||
| Output price | +$11.6/1M | ||
| Context window | +869k |
Simulate monthly production API costs in USD (US Dollar).
Qwen3.8 27B is estimated to save $240.50/month ($2,886/year).
Higher SWE-bench (70.4%).
Lower output list price ($0.4/1M).
Lower TTFT (140 ms).
Larger window (1M).
GPT-5.6 Terra is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | GPT-5.6 Terra | Higher SWE-bench (70.4%). |
| High-volume chat | Qwen3.8 27B | Lower output list price ($0.4/1M). |
| Voice / low-latency UI | Qwen3.8 27B | Lower TTFT (140 ms). |
| Long-document RAG | GPT-5.6 Terra | Larger window (1M). |
| Screenshots / vision | GPT-5.6 Terra | GPT-5.6 Terra is the side marked multimodal in the catalog. |
Alibaba open-weight 27B drop. Local/open-weight lists should see it. It will not win frontier-agents.
Terra is OpenAI’s Sonnet-class invoice. Use it when Sol is too expensive and Luna is too small.
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Verified Head-to-Head Telemetry
