Claude Opus 5 vs GPT-5.6 Luna: Specs & Benchmark Comparison
| Characteristic | Claude Opus 5 | GPT-5.6 Luna |
|---|---|---|
| Company | Anthropic | OpenAI |
| Release Date | July 24, 2026 | July 9, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $5.00 | $0.20 |
| Output Price / 1M | $25.00 | $1.20 |
| Average Score | 0.6 | 0.5 |
| Benchmarks | ||
| ARC-AGI-3 | 0.3 | 0.0 |
| OSWorld 2.0 | 0.7 | 0.5 |
| FrontierCode 1.1 | 0.5 | 0.4 |
| AutomationBench | 0.3 | 0.1 |
| BrowseComp | 0.9 | 0.8 |
| HealthBench Professional | 0.6 | 0.6 |
| DeepSWE 1.1 | 0.7 | 0.7 |
Visual Benchmark Comparison
Claude Opus 5
GPT-5.6 Luna
ARC-AGI-30.3 vs 0.0
0.3
OSWorld 2.00.7 vs 0.5
0.7
0.5
FrontierCode 1.10.5 vs 0.4
0.5
0.4
AutomationBench0.3 vs 0.1
0.3
0.1
BrowseComp0.9 vs 0.8
0.9
0.8
HealthBench Professional0.6 vs 0.6
0.6
0.6
DeepSWE 1.10.7 vs 0.7
0.7
0.7
Verdict
GPT-5.6 Luna leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Opus 5 — 0.6, GPT-5.6 Luna — 0.5.
API Cost
GPT-5.6 Luna is 21.4x cheaper: input $0.20/1M vs $5.00/1M tokens.
Context Window
GPT-5.6 Luna supports a larger context: 1M vs 1M tokens.
Recency
Claude Opus 5 is newer: released 7/24/2026 vs 7/9/2026.
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Frequently Asked Questions
Which is better for coding — Claude Opus 5 or GPT-5.6 Luna?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Opus 5 or GPT-5.6 Luna?
GPT-5.6 Luna is cheaper for input: $0.20 per 1M tokens vs $5.00.
Which has a larger context window — Claude Opus 5 or GPT-5.6 Luna?
GPT-5.6 Luna supports a larger context: 1,050,000 tokens vs 1,000,000.
The Claude Opus 5 and GPT-5.6 Luna comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Opus 5 or GPT-5.6 Luna page. See also the complete list of AI model comparisons.