Pairwise benchmark snapshot · Aug 17, 2026
In this head-to-head showdown, GPT-5.6 Terra delivers higher overall intelligence and human-preferred responses (Elo 1,548 vs 1,536), while DeepSeek V4 Pro leads in SWE-bench software engineering benchmarks (71.6%), while DeepSeek V4 Pro is more budget-friendly at $3.96/1M per 1M output tokens, while GPT-5.6 Terra provides faster response streaming (128 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
Open-weight-adjacent DeepSeek flagship. High reasoning density per dollar.
OpenAI 5.6 mid tier. Official API $2/$12 per 1M after the Jul 30 2026 price cut.
Currently comparing DeepSeek V4 Pro vs GPT-5.6 Terra. 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 12 Arena Elo pts
128 tok/s
$3.9600000000000004 / 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 | DeepSeek V4 Pro | GPT-5.6 Terra | Advantage Delta |
|---|---|---|---|
| Preference Elo | +12 | ||
| Coding Elo | +2 | ||
| LiveBench | +1% | ||
| SWE-bench | +1.2% | ||
| GPQA Diamond | +2% | ||
| Time to first token | +250 ms | ||
| Output speed | 70 tok/s | 128 tok/s | +58 tok/s |
| Input price | $1.32/1M | +$0.32/1M | |
| Output price | $3.96/1M | +$2.04/1M | |
| Context window | +1k |
Simulate monthly production API costs in USD (US Dollar).
DeepSeek V4 Pro is estimated to save $19.40/month ($233/year).
Higher SWE-bench (71.6%).
Lower output list price ($3.96/1M).
Lower TTFT (160 ms).
Larger window (1.1M).
GPT-5.6 Terra is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | DeepSeek V4 Pro | Higher SWE-bench (71.6%). |
| High-volume chat | DeepSeek V4 Pro | Lower output list price ($3.96/1M). |
| Voice / low-latency UI | GPT-5.6 Terra | Lower TTFT (160 ms). |
| Long-document RAG | GPT-5.6 Terra | Larger window (1.1M). |
| Screenshots / vision | GPT-5.6 Terra | GPT-5.6 Terra is the side marked multimodal in the catalog. |
Terra is OpenAI’s Sonnet-class invoice. Use it when Sol is too expensive and Luna is too small.
Top DeepSeek vs top Anthropic Elo. Usually V4 Pro vs Opus 5. License and invoice decide as much as Elo.
2026-06 open-weight-adjacent flagship. The usual cheap-vs-Claude question starts here.
Jan 2025 reasoning model. Still searched. V4 Pro is the newer DeepSeek buy.
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