GPT-5.4 vs GPT-5.6 Luna
Side-by-side comparison. Updated 2026-07-09.
Summary
Compare GPT-5.4 and GPT-5.6 Luna across pricing, context window, modalities, strengths, weaknesses, and best-fit workloads.
Use the details below to weigh cost, context, modalities, and workload fit.
At a Glance
| Attribute | GPT-5.4 | GPT-5.6 Luna |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | Intelligent Coding Agentic Long Context | Fast Intelligent Coding |
| Context | 1,050,000 tokens | 1,050,000 tokens |
| Input price | $2.50/1M | $1.00/1M |
| Output price | $15.00/1M | $6.00/1M |
| Input modalities | Text, Image, File | Text |
| Output modalities | Text | Text |
GPT-5.4 Strengths
GPT-5.6 Luna Strengths
- Cheapest GPT-5.6 tier at $1/$6 per 1M tokens
- Fastest tier — built for latency-sensitive, high-volume workloads
- 1.05M-token context despite the low price point
- Good default for cost-sensitive production traffic