token.app › Compare › Claude Opus 4.8 vs GPT-5.6 Luna
Claude Opus 4.8 vs GPT-5.6 Luna
GPT-5.6 Luna leads on 4 of 5 shared benchmarks. GPT-5.6 Luna is 44× 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
| Claude Opus 4.8 | GPT-5.6 Luna | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input $/1M | $5.00 | $0.100 |
| Output $/1M | $25.00 | $0.600 |
| Blended $/1M | $10.00 | $0.225 |
| Context window | 1M | 1.1M |
| Max output | 128K | 128K |
| Released | May 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 91.0% | 91.6% |
| FrontierMath T1–3 | 80.0% | 82.1% |
| FrontierMath T4 | 56.1% | 61.0% |
| SimpleQA Verified | 39.5% | 41.7% |
| OTIS Mock AIME | 98.3% | 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 Claude Opus 4.8 if…
- No clear advantage on the data we hold.
Choose GPT-5.6 Luna if…
- Costs less per token — $0.225 vs $10.00 blended
- Higher GPQA Diamond (91.6% vs 91.0%)
- Higher FrontierMath T1–3 (82.1% vs 80.0%)
- Higher FrontierMath T4 (61.0% vs 56.1%)
- Higher SimpleQA Verified (41.7% vs 39.5%)
- Larger context window (1.1M)
- Newer model (released Jul 2026)
FAQ
Which is better, Claude Opus 4.8 or GPT-5.6 Luna?
Across the 5 benchmarks both models have independently-run scores for, Claude Opus 4.8 leads on 0 and GPT-5.6 Luna leads on 4. Benchmarks are one input — price and context window are on this page too.
Is Claude Opus 4.8 cheaper than GPT-5.6 Luna?
GPT-5.6 Luna is cheaper: $0.225 versus $10.00 per million tokens blended at 3:1 input:output. Input alone: $5.00 vs $0.100. Output alone: $25.00 vs $0.600.
What context windows do Claude Opus 4.8 and GPT-5.6 Luna have?
Claude Opus 4.8: 1,000,000 tokens. GPT-5.6 Luna: 1,050,000 tokens.
Who makes Claude Opus 4.8 and GPT-5.6 Luna?
Claude Opus 4.8 is made by Anthropic. GPT-5.6 Luna is made by OpenAI.