DeepSeek-V4 Flash vs GPT-5.6 Luna
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: DeepSeek-V4 Flash or GPT-5.6 Luna?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | DeepSeek-V4 Flash | GPT-5.6 Luna | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $0.14 | $0.18 | DeepSeek-V4 Flash is 1.3x cheaper |
| Output Cost / 1M Tokens | $0.56 | $0.72 | DeepSeek-V4 Flash (22.2% lower) |
| Avg TTFT Response Latency | 150ms | 90ms | GPT-5.6 Luna (+60ms faster) |
| SWE-bench Verified (Coding) | 62.4% | 48.5% | DeepSeek-V4 Flash (+13.9% lead) |
| Inference Value Score (IVR) | 99.9 / 100 | 99.9 / 100 | GPT-5.6 Luna (+0 pts) |
Interactive Monthly Token Economics & ROI Forecaster
Model your expected production workload across prompt (input) and completion (output) tokens.
Estimated Monthly Spend
$0.14/1M in · $0.56/1M out
$0.18/1M in · $0.72/1M out
When to Choose DeepSeek-V4 Flash
Choose DeepSeek-V4 Flash when you need Ultra-low-cost open-weights reasoning and coding with 1M context at unprecedented token generation speeds. and have an infrastructure budget aligned with $0.14/1M tokens.
When to Choose GPT-5.6 Luna
Choose GPT-5.6 Luna when you need Real-time conversational agents, high-volume classification, intent detection, and low-latency interactive apps. and prioritize OpenAI ecosystem integration at $0.18/1M tokens.
Related Questions & Decision Factors
Which is cheaper: DeepSeek-V4 Flash or GPT-5.6 Luna?
DeepSeek-V4 Flash is cheaper at $0.14/1M input tokens compared to $0.18/1M for GPT-5.6 Luna.
Which model has lower latency: DeepSeek-V4 Flash or GPT-5.6 Luna?
GPT-5.6 Luna delivers faster response times with an average TTFT of 90ms vs 150ms for DeepSeek-V4 Flash.
When should you choose DeepSeek-V4 Flash?
Choose DeepSeek-V4 Flash when you need Ultra-low-cost open-weights reasoning and coding with 1M context at unprecedented token generation speeds. and have an infrastructure budget aligned with $0.14/1M tokens.
When should you choose GPT-5.6 Luna?
Choose GPT-5.6 Luna when you need Real-time conversational agents, high-volume classification, intent detection, and low-latency interactive apps. and prioritize OpenAI ecosystem integration at $0.18/1M tokens.