Fable 5 vs GPT-5.6 Luna
Live Unit Economics, TTFT Latency & Reasoning Benchmark Analysis
Which model is better: Fable 5 or GPT-5.6 Luna?
Verified Performance & Unit Economics Delta
Daily synchronized metrics from synthetic latency endpoints and benchmark evaluations.
| Metric / Dimension | Fable 5 | GPT-5.6 Luna | Net Delta / Advantage |
|---|---|---|---|
| Input Cost / 1M Tokens | $2.00 | $0.18 | GPT-5.6 Luna is 11.1x cheaper |
| Output Cost / 1M Tokens | $8.00 | $0.72 | GPT-5.6 Luna (1011.1% lower) |
| Avg TTFT Response Latency | 240ms | 90ms | GPT-5.6 Luna (+150ms faster) |
| SWE-bench Verified (Coding) | 58% | 48.5% | Fable 5 (+9.5% lead) |
| Inference Value Score (IVR) | 59.8 / 100 | 99.9 / 100 | GPT-5.6 Luna (+40.1 pts) |
Interactive Monthly Token Economics & ROI Forecaster
Model your expected production workload across prompt (input) and completion (output) tokens.
Estimated Monthly Spend
$2/1M in · $8/1M out
$0.18/1M in · $0.72/1M out
When to Choose Fable 5
Choose Fable 5 when you need Long-horizon multi-agent world simulations, narrative engine synthesis, interactive character memory, and creative reasoning. and have an infrastructure budget aligned with $2.00/1M 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: Fable 5 or GPT-5.6 Luna?
GPT-5.6 Luna is cheaper at $0.18/1M input tokens compared to $2.00/1M for Fable 5.
Which model has lower latency: Fable 5 or GPT-5.6 Luna?
GPT-5.6 Luna delivers faster response times with an average TTFT of 90ms vs 240ms for Fable 5.
When should you choose Fable 5?
Choose Fable 5 when you need Long-horizon multi-agent world simulations, narrative engine synthesis, interactive character memory, and creative reasoning. and have an infrastructure budget aligned with $2.00/1M 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.