token.app › Compare › GPT-5.1 vs GPT-5.6 Luna
GPT-5.1 vs GPT-5.6 Luna
GPT-5.6 Luna leads on 2 of 3 shared benchmarks. GPT-5.6 Luna is 15× cheaper per token on a blended 3:1 basis. GPT-5.6 Luna accepts the larger context window (1.1M).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-5.1 | GPT-5.6 Luna | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input $/1M | $1.25 | $0.100 |
| Output $/1M | $10.00 | $0.600 |
| Blended $/1M | $3.44 | $0.225 |
| Context window | 400K | 1.1M |
| Max output | 128K | 128K |
| Released | Nov 2025 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 87.6% | 91.6% |
| SimpleQA Verified | 48.9% | 41.7% |
| OTIS Mock AIME | 88.6% | 98.3% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose GPT-5.1 if…
- Higher SimpleQA Verified (48.9% vs 41.7%)
Choose GPT-5.6 Luna if…
- Costs less per token — $0.225 vs $3.44 blended
- Higher GPQA Diamond (91.6% vs 87.6%)
- Higher OTIS Mock AIME (98.3% vs 88.6%)
- Larger context window (1.1M)
- Newer model (released Jul 2026)
FAQ
Which is better, GPT-5.1 or GPT-5.6 Luna?
Across the 3 benchmarks both models have independently-run scores for, GPT-5.1 leads on 1 and GPT-5.6 Luna leads on 2. Benchmarks are one input — price and context window are on this page too.
Is GPT-5.1 cheaper than GPT-5.6 Luna?
GPT-5.6 Luna is cheaper: $0.225 versus $3.44 per million tokens blended at 3:1 input:output. Input alone: $1.25 vs $0.100. Output alone: $10.00 vs $0.600.
What context windows do GPT-5.1 and GPT-5.6 Luna have?
GPT-5.1: 400,000 tokens. GPT-5.6 Luna: 1,050,000 tokens.
Who makes GPT-5.1 and GPT-5.6 Luna?
GPT-5.1 is made by OpenAI. GPT-5.6 Luna is made by OpenAI.