token.app › Compare › Phi 4 vs GPT-5.6 Luna
Phi 4 vs GPT-5.6 Luna
GPT-5.6 Luna leads on 2 of 2 shared benchmarks. Phi 4 is 2.6× 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
| Phi 4 | GPT-5.6 Luna | |
|---|---|---|
| Provider | Microsoft | OpenAI |
| Input $/1M | $0.070 | $0.100 |
| Output $/1M | $0.140 | $0.600 |
| Blended $/1M | $0.088 | $0.225 |
| Context window | 16K | 1.1M |
| Max output | 16K | 128K |
| Released | Jan 2025 | Jul 2026 |
| Licence | Open weights | Proprietary |
| GPQA Diamond | 56.1% | 91.6% |
| OTIS Mock AIME | 13.8% | 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 Phi 4 if…
- Costs less per token — $0.088 vs $0.225 blended
- Open weights — self-hostable
Choose GPT-5.6 Luna if…
- Higher GPQA Diamond (91.6% vs 56.1%)
- Higher OTIS Mock AIME (98.3% vs 13.8%)
- Larger context window (1.1M)
- Newer model (released Jul 2026)
FAQ
Which is better, Phi 4 or GPT-5.6 Luna?
Across the 2 benchmarks both models have independently-run scores for, Phi 4 leads on 0 and GPT-5.6 Luna leads on 2. Benchmarks are one input — price and context window are on this page too.
Is Phi 4 cheaper than GPT-5.6 Luna?
Phi 4 is cheaper: $0.088 versus $0.225 per million tokens blended at 3:1 input:output. Input alone: $0.070 vs $0.100. Output alone: $0.140 vs $0.600.
What context windows do Phi 4 and GPT-5.6 Luna have?
Phi 4: 16,384 tokens. GPT-5.6 Luna: 1,050,000 tokens.
Who makes Phi 4 and GPT-5.6 Luna?
Phi 4 is made by Microsoft. GPT-5.6 Luna is made by OpenAI.