OpenAI GPT-4o vs GPT-5.6 Luna
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: OpenAI GPT-4o or GPT-5.6 Luna?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | OpenAI GPT-4o | GPT-5.6 Luna | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $2.50 | $0.18 | GPT-5.6 Luna is 13.9x cheaper |
| Output Cost / 1M Tokens | $10.00 | $0.72 | GPT-5.6 Luna (1288.9% lower) |
| Avg TTFT Response Latency | 280ms | 90ms | GPT-5.6 Luna (+190ms faster) |
| SWE-bench Verified (Coding) | 38.8% | 48.5% | GPT-5.6 Luna (+9.7% lead) |
| Inference Value Score (IVR) | 45.5 / 100 | 99.9 / 100 | GPT-5.6 Luna (+54.4 pts) |
Interactive Monthly Token Economics & ROI Forecaster
Model your expected production workload across prompt (input) and completion (output) tokens.
Estimated Monthly Spend
$2.5/1M in · $10/1M out
$0.18/1M in · $0.72/1M out
When to Choose OpenAI GPT-4o
Choose OpenAI GPT-4o when you need General multimodal assistant applications, consumer chat interfaces, and enterprise knowledge workers. and have an infrastructure budget aligned with $2.50/1M 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: OpenAI GPT-4o or GPT-5.6 Luna?
GPT-5.6 Luna is cheaper at $0.18/1M input tokens compared to $2.50/1M for OpenAI GPT-4o.
Which model has lower latency: OpenAI GPT-4o or GPT-5.6 Luna?
GPT-5.6 Luna delivers faster response times with an average TTFT of 90ms vs 280ms for OpenAI GPT-4o.
When should you choose OpenAI GPT-4o?
Choose OpenAI GPT-4o when you need General multimodal assistant applications, consumer chat interfaces, and enterprise knowledge workers. and have an infrastructure budget aligned with $2.50/1M 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.