GPT-5.6 Luna vs Grok 3
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: GPT-5.6 Luna or Grok 3?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | GPT-5.6 Luna | Grok 3 | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $0.18 | $3.00 | GPT-5.6 Luna is 16.7x cheaper |
| Output Cost / 1M Tokens | $0.72 | $15.00 | GPT-5.6 Luna (95.2% lower) |
| Avg TTFT Response Latency | 90ms | 850ms | GPT-5.6 Luna (+760ms faster) |
| SWE-bench Verified (Coding) | 48.5% | 58.5% | Grok 3 (+10.0% lead) |
| Inference Value Score (IVR) | 99.9 / 100 | 45.9 / 100 | GPT-5.6 Luna (+54 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
$3/1M in · $15/1M 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 Grok 3
Choose Grok 3 when you need Frontier scientific reasoning, real-time web exploration, and advanced mathematical problem solving. and prioritize xAI ecosystem integration at $3.00/1M tokens.
Related Questions & Decision Factors
Which is cheaper: GPT-5.6 Luna or Grok 3?
GPT-5.6 Luna is cheaper at $0.18/1M input tokens compared to $3.00/1M for Grok 3.
Which model has lower latency: GPT-5.6 Luna or Grok 3?
GPT-5.6 Luna delivers faster response times with an average TTFT of 90ms vs 850ms for Grok 3.
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 Grok 3?
Choose Grok 3 when you need Frontier scientific reasoning, real-time web exploration, and advanced mathematical problem solving. and prioritize xAI ecosystem integration at $3.00/1M tokens.