GPT-5.6 Luna vs o3-mini
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: GPT-5.6 Luna or o3-mini?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | GPT-5.6 Luna | o3-mini | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $0.18 | $1.10 | GPT-5.6 Luna is 6.1x cheaper |
| Output Cost / 1M Tokens | $0.72 | $4.40 | GPT-5.6 Luna (83.6% lower) |
| Avg TTFT Response Latency | 90ms | 1200ms | GPT-5.6 Luna (+1110ms faster) |
| SWE-bench Verified (Coding) | 48.5% | 49.3% | o3-mini (+0.8% lead) |
| Inference Value Score (IVR) | 99.9 / 100 | 77 / 100 | GPT-5.6 Luna (+22.9 pts) |
Interactive Monthly Token Economics & ROI Forecaster
Model your expected production workload across prompt (input) and completion (output) tokens.
Estimated Monthly Spend
$0.18/1M in · $0.72/1M out
$1.1/1M in · $4.4/1M out
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 have an infrastructure budget aligned with $0.18/1M tokens.
When to Choose o3-mini
Choose o3-mini when you need Cost-efficient STEM reasoning, high-throughput math problem-solving, and structured code synthesis. and prioritize OpenAI ecosystem integration at $1.10/1M tokens.
Related Questions & Decision Factors
Which is cheaper: GPT-5.6 Luna or o3-mini?
GPT-5.6 Luna is cheaper at $0.18/1M input tokens compared to $1.10/1M for o3-mini.
Which model has lower latency: GPT-5.6 Luna or o3-mini?
GPT-5.6 Luna delivers faster response times with an average TTFT of 90ms vs 1200ms for o3-mini.
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 have an infrastructure budget aligned with $0.18/1M tokens.
When should you choose o3-mini?
Choose o3-mini when you need Cost-efficient STEM reasoning, high-throughput math problem-solving, and structured code synthesis. and prioritize OpenAI ecosystem integration at $1.10/1M tokens.