Claude Sonnet 5 vs GPT-5.6 Luna: Specs & Benchmark Comparison
| Characteristic | Claude Sonnet 5 | GPT-5.6 Luna |
|---|---|---|
| Company | Anthropic | OpenAI |
| Release Date | June 30, 2026 | July 9, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 64K | 128K |
| Input Price / 1M | $2.00 | $0.20 |
| Output Price / 1M | $10.00 | $1.20 |
| Average Score | 0.6 | 0.5 |
| Benchmarks | ||
| GDP.pdf | 0.8 | 0.2 |
| BenchCAD | 0.4 | 0.6 |
| DeepSWE 1.1 | 0.5 | 0.7 |
| FrontierCode 1.1 | 0.4 | 0.4 |
| HealthBench Professional | 0.6 | 0.6 |
| BrowseComp | 0.8 | 0.8 |
| AutomationBench | 0.1 | 0.1 |
| Toolathlon | 0.5 | 0.5 |
| SWE-Bench Pro | 0.6 | 0.6 |
Visual Benchmark Comparison
Claude Sonnet 5
GPT-5.6 Luna
GDP.pdf0.8 vs 0.2
0.8
0.2
BenchCAD0.4 vs 0.6
0.4
0.6
DeepSWE 1.10.5 vs 0.7
0.5
0.7
FrontierCode 1.10.4 vs 0.4
0.4
0.4
HealthBench Professional0.6 vs 0.6
0.6
0.6
BrowseComp0.8 vs 0.8
0.8
0.8
AutomationBench0.1 vs 0.1
0.1
0.1
Toolathlon0.5 vs 0.5
0.5
0.5
SWE-Bench Pro0.6 vs 0.6
0.6
0.6
Verdict
GPT-5.6 Luna leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Sonnet 5 — 0.6, GPT-5.6 Luna — 0.5.
API Cost
GPT-5.6 Luna is 8.6x cheaper: input $0.20/1M vs $2.00/1M tokens.
Context Window
GPT-5.6 Luna supports a larger context: 1M vs 1M tokens.
Recency
Both models were released around the same time: 6/30/2026 and 7/9/2026.
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Frequently Asked Questions
Which is better for coding — Claude Sonnet 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 Sonnet 5 or GPT-5.6 Luna?
GPT-5.6 Luna is cheaper for input: $0.20 per 1M tokens vs $2.00.
Which has a larger context window — Claude Sonnet 5 or GPT-5.6 Luna?
GPT-5.6 Luna supports a larger context: 1,050,000 tokens vs 1,000,000.
The Claude Sonnet 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 Sonnet 5 or GPT-5.6 Luna page. See also the complete list of AI model comparisons.