token.app › Compare › Grok 4.5 vs GPT-5.6 Luna
Grok 4.5 vs GPT-5.6 Luna
GPT-5.6 Luna leads on 3 of 5 shared benchmarks. GPT-5.6 Luna is 13× 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
| Grok 4.5 | GPT-5.6 Luna | |
|---|---|---|
| Provider | xAI | OpenAI |
| Input $/1M | $2.00 | $0.100 |
| Output $/1M | $6.00 | $0.600 |
| Blended $/1M | $3.00 | $0.225 |
| Context window | 500K | 1.1M |
| Max output | — | 128K |
| Released | Jul 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 93.4% | 91.6% |
| FrontierMath T1–3 | 57.2% | 82.1% |
| FrontierMath T4 | 24.4% | 61.0% |
| SimpleQA Verified | 53.5% | 41.7% |
| OTIS Mock AIME | 97.8% | 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 Grok 4.5 if…
- Higher GPQA Diamond (93.4% vs 91.6%)
- Higher SimpleQA Verified (53.5% vs 41.7%)
Choose GPT-5.6 Luna if…
- Costs less per token — $0.225 vs $3.00 blended
- Higher FrontierMath T1–3 (82.1% vs 57.2%)
- Higher FrontierMath T4 (61.0% vs 24.4%)
- Higher OTIS Mock AIME (98.3% vs 97.8%)
- Larger context window (1.1M)
- Newer model (released Jul 2026)
FAQ
Which is better, Grok 4.5 or GPT-5.6 Luna?
Across the 5 benchmarks both models have independently-run scores for, Grok 4.5 leads on 2 and GPT-5.6 Luna leads on 3. Benchmarks are one input — price and context window are on this page too.
Is Grok 4.5 cheaper than GPT-5.6 Luna?
GPT-5.6 Luna is cheaper: $0.225 versus $3.00 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $0.100. Output alone: $6.00 vs $0.600.
What context windows do Grok 4.5 and GPT-5.6 Luna have?
Grok 4.5: 500,000 tokens. GPT-5.6 Luna: 1,050,000 tokens.
Who makes Grok 4.5 and GPT-5.6 Luna?
Grok 4.5 is made by xAI. GPT-5.6 Luna is made by OpenAI.