GPT-5.6 Luna
GPT-5.6 Luna by OpenAI: League Score, pricing, context window and sourced benchmarks — the full tracked record.
60 Closed $0.20 / $1.20 per 1M 1.1M context
League positions: #24 overall · #10 Reasoning Division · #4 Value Division. Score coverage: 65% of components measured. Count tokens & cost for GPT-5.6 Luna · Estimate a workload cost
Specifications & pricing
| Maker | OpenAI — lab profile |
| Family | GPT-5.6 |
| Released | Jul 9, 2026 |
| Status | Current |
| Weights | Closed / proprietary API |
| License | Proprietary |
| Knowledge cutoff | 2026-02-16 |
| Context window | 1,050,000 tokens |
| Max output | 128,000 tokens |
| Modalities in | text, image |
| Modalities out | text |
| API price (input) | $0.20 per 1M tokens |
| API price (output) | $1.20 per 1M tokens |
| Cached input | $0.020 per 1M |
| Blended (3:1 in:out) | $0.45 per 1M |
| Pricing source | Official pricing page (checked Oct 14, 2026) |
| API access | OpenAI API |
Benchmark results
| Benchmark | Score | Source | Date | Link |
|---|---|---|---|---|
| GPQA Diamond | 92.3 / 100 | BenchLM GPQA leaderboard | Oct 14, 2026 | Source |
| LiveBench overall | 66.1 / 100 | LiveBench | Oct 14, 2026 | Source |
| MMLU-Pro | 86.0 / 100 | BenchLM MMLU-Pro (Vals AI mirror) | Oct 14, 2026 | Source |
How its League Score is built
| Component | Raw | Normalised | Weight | Date | Link |
|---|---|---|---|---|---|
| LiveBench overall | 66.1 | 47.9 | 40% | Oct 14, 2026 | Source |
| GPQA Diamond | 92.3 | 83.9 | 15% | Oct 14, 2026 | Source |
| MMLU-Pro | 86.0 | 74.8 | 10% | Oct 14, 2026 | Source |
Normalised 0–100 against the tracked field; missing components redistribute their weight. Full rules on the methodology page.
Closest rivals
- GPT-5.6 Luna vs GPT-5 — full comparison or compare any pair
- GPT-5.6 Luna vs Qwen3.5-397B-A17B — full comparison or compare any pair
- GPT-5.6 Luna vs Mistral Medium 3.5 — full comparison or compare any pair
FAQ
How much does GPT-5.6 Luna cost?
GPT-5.6 Luna costs $0.20 per 1M input tokens and $1.20 per 1M output tokens on the first-party API (checked Oct 14, 2026).
What is the context window of GPT-5.6 Luna?
GPT-5.6 Luna accepts up to 1,050,000 tokens of context.
Is GPT-5.6 Luna open source?
No — GPT-5.6 Luna is a closed model available through OpenAI’s API and products.
Data verified Oct 14, 2026. Spotted an error? Every figure above links to its source.