Claude Opus 5 vs GPT-5.6 Luna
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: Claude Opus 5 or GPT-5.6 Luna?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | Claude Opus 5 | GPT-5.6 Luna | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $5.00 | $0.18 | GPT-5.6 Luna is 27.8x cheaper |
| Output Cost / 1M Tokens | $25.00 | $0.72 | GPT-5.6 Luna (3372.2% lower) |
| Avg TTFT Response Latency | 340ms | 90ms | GPT-5.6 Luna (+250ms faster) |
| SWE-bench Verified (Coding) | 82.4% | 48.5% | Claude Opus 5 (+33.9% lead) |
| Inference Value Score (IVR) | 42.7 / 100 | 99.9 / 100 | GPT-5.6 Luna (+57.2 pts) |
Interactive Monthly Token Economics & ROI Forecaster
Model your expected production workload across prompt (input) and completion (output) tokens.
Estimated Monthly Spend
$5/1M in · $25/1M out
$0.18/1M in · $0.72/1M out
When to Choose Claude Opus 5
Choose Claude Opus 5 when you need Pinnacle autonomous software architecture, whole-system enterprise codebases, PhD-level scientific synthesis, and complex multi-agent delegation. and have an infrastructure budget aligned with $5.00/1M 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: Claude Opus 5 or GPT-5.6 Luna?
GPT-5.6 Luna is cheaper at $0.18/1M input tokens compared to $5.00/1M for Claude Opus 5.
Which model has lower latency: Claude Opus 5 or GPT-5.6 Luna?
GPT-5.6 Luna delivers faster response times with an average TTFT of 90ms vs 340ms for Claude Opus 5.
When should you choose Claude Opus 5?
Choose Claude Opus 5 when you need Pinnacle autonomous software architecture, whole-system enterprise codebases, PhD-level scientific synthesis, and complex multi-agent delegation. and have an infrastructure budget aligned with $5.00/1M 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.