Pairwise benchmark snapshot · Aug 16, 2026
In this head-to-head showdown, GPT-5.6 Sol delivers higher overall intelligence and human-preferred responses (Elo 1,608 vs 1,490), while GPT-5.6 Sol leads in SWE-bench software engineering benchmarks (77.6%), while DeepSeek V4 Flash is more budget-friendly at $0.28/1M 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
DeepSeek Jul 31 2026 price-performance SKU. Public listings put it near $0.14/$0.28 per 1M tokens.
OpenAI 5.6 flagship tier. Official API $5/$30 per 1M tokens (OpenAI pricing, Jul 30 2026 update left Sol unchanged).
Currently comparing DeepSeek V4 Flash vs GPT-5.6 Sol. 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 118 Arena Elo pts
142 tok/s
$0.28 / 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 Flash | GPT-5.6 Sol | Advantage Delta |
|---|---|---|---|
| Preference Elo | +118 | ||
| Coding Elo | +86 | ||
| LiveBench | +6.1% | ||
| SWE-bench | +6.4% | ||
| GPQA Diamond | +5.2% | ||
| Time to first token | +105 ms | ||
| Output speed | 142 tok/s | 84 tok/s | +58 tok/s |
| Input price | $0.14/1M | +$4.86/1M | |
| Output price | $0.28/1M | +$29.72/1M | |
| Context window | +840k |
Simulate monthly production API costs in USD (US Dollar).
DeepSeek V4 Flash is estimated to save $615.90/month ($7,391/year).
Higher SWE-bench (77.6%).
Lower output list price ($0.28/1M).
Lower TTFT (165 ms).
Larger window (1M).
GPT-5.6 Sol is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | GPT-5.6 Sol | Higher SWE-bench (77.6%). |
| High-volume chat | DeepSeek V4 Flash | Lower output list price ($0.28/1M). |
| Voice / low-latency UI | DeepSeek V4 Flash | Lower TTFT (165 ms). |
| Long-document RAG | GPT-5.6 Sol | Larger window (1M). |
| Screenshots / vision | GPT-5.6 Sol | GPT-5.6 Sol is the side marked multimodal in the catalog. |
Brand hub remaps to top xAI vs top OpenAI. After Aug 12 that is Grok 4.6 vs Sol.
Public listings put Flash near $0.14/$0.28 per 1M. That is a batch SKU, not a chatbot crown.
Not a frozen 2025 article. Today that is usually Opus 5 vs GPT-5.6 Sol. Dated cells, not a brand fight.
Hub remaps to top Google vs top OpenAI Elo. Usually 3.6 Pro vs Sol. Window vs price is the plot.
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Verified Head-to-Head Telemetry
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