Model comparison
GPT-6 Astra vs GPT-5.6 Luna
OpenAIGPT-6 Astra
- Input
- $10.00
- Output
- $50.00
- Context
- not published
- Released
- 2026-09-03
- Input
- $0.20
- Output
- $1.20
- Context
- 1.05M
- Released
- 2026-07-09
Short answer
GPT-5.6 Luna is cheaper on input tokens ($0.2 vs $10 per 1M, 50×).
Specs and pricing side by side
| Spec | GPT-6 Astra | GPT-5.6 Luna |
|---|---|---|
| Maker | OpenAI | OpenAIsame |
| Released | 2026-09-03 | 2026-07-09 |
| Context window | not published | 1.05M |
| Max output | not published | 128K |
| Input price | $10.00 | $0.20 |
| Output price | $50.00 | $1.20 |
| License | Proprietary | Proprietarysame |
| Weights | API only | API onlysame |
| Modalities | Text, Vision | Text, Visionsame |
| Knowledge cutoff | not published | 2026-02-16 |
Not published by either maker: parameters.
Benchmarks both models report
These two models have no benchmark in common in our registry, so there is no like-for-like score to compare. See each model’s own results: GPT-6 Astra, GPT-5.6 Luna.
Which one should you pick?
Pick GPT-6 Astra if…
- Your use case is: reach for it when a job means driving a browser or desktop app to completion rather than producing text about it.
Pick GPT-5.6 Luna if…
- Cost matters: input tokens cost 50× less ($0.2 vs $10 per 1M).
- Your use case is: reach for it for high-volume batch processing, classification, and embedded application work.
FAQ
Which is better, GPT-6 Astra or GPT-5.6 Luna?
GPT-5.6 Luna is cheaper on input tokens ($0.2 vs $10 per 1M, 50×). The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How much cheaper is GPT-5.6 Luna?
GPT-6 Astra: $10.00 input, $50.00 output. GPT-5.6 Luna: $0.20 input, $1.20 output (list API prices as published by each maker).
Is GPT-6 Astra newer than GPT-5.6 Luna?
GPT-6 Astra was released 2026-09-03; GPT-5.6 Luna was released 2026-07-09.