GPT-6 Astra (batch) Paid vs GPT-5.6 Luna Paid
GPT-6 Astra (batch) vs GPT-5.6 Luna compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
GPT-6 Astra (batch) — full profile › · GPT-5.6 Luna — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$25 /M outputManaged API (no infra to run)
$1.2 /M outputManaged API (no infra to run)
GPT-6 Astra (batch) vs GPT-5.6 Luna specs
| Spec | GPT-6 Astra (batch) | GPT-5.6 Luna | Winner |
|---|---|---|---|
| Maker | OpenAI | OpenAI | – |
| Type | Proprietary | Proprietary | – |
| Context window | 1.1M tokens | 1.1M tokens | = Tie |
| Input price | $5/M | $0.2/M | |
| Output price | $25/M | $1.2/M | |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
GPT-5.6 Luna is ~21× cheaper than GPT-6 Astra (batch) on output tokens ($1.2 vs $25 per M tokens).
- You want frontier performance through a managed API
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | GPT-6 Astra (batch) | GPT-5.6 Luna |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✓ |
Benchmarks: GPT-6 Astra (batch) vs GPT-5.6 Luna
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How GPT-6 Astra (batch) and GPT-5.6 Luna score
| Criterion | GPT-6 Astra (batch) | GPT-5.6 Luna |
|---|---|---|
| Cost-efficiency | 3.0 | 4.5 |
| Context window | 5.0 | 5.0 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
GPT-6 Astra (batch) Paid
GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon...
GPT-5.6 Luna Paid
GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...
Frequently asked questions
GPT-6 Astra (batch) vs GPT-5.6 Luna — which is cheaper?
GPT-5.6 Luna is cheaper on output ($1.2/M vs $25/M).
Which has the larger context window?
GPT-6 Astra (batch) offers the larger context window (1.1M tokens).
GPT-6 Astra (batch) vs GPT-5.6 Luna — which should I pick in 2026?
Choose GPT-5.6 Luna for the lower output price ($1.2/M vs $25/M). Choose GPT-6 Astra (batch) if you need the larger 1.1M context window.
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