GPT-5.6 Luna vs Hy4 preview: Specs & Benchmark Comparison
| Characteristic | GPT-5.6 Luna | Hy4 preview |
|---|---|---|
| Company | OpenAI | Tencent |
| Release Date | July 9, 2026 | August 28, 2026 |
| Parameters | — | 770B |
| Multimodal | Yes | No |
| Context (input) | 1.1M | — |
| Context (output) | 128K | — |
| Input Price / 1M | $0.20 | — |
| Output Price / 1M | $1.20 | — |
| Average Score | 0.5 | 0.6 |
| Benchmarks | ||
| Agents' Last Exam | 0.5 | 0.2 |
| Toolathlon | 0.5 | 0.7 |
| AutomationBench | 0.1 | 0.3 |
| SWE-Bench Pro | 0.6 | 0.7 |
| DeepSWE | 0.7 | 0.6 |
| Terminal-Bench 2.1 | 0.8 | 0.9 |
| GPQA | 0.9 | 0.9 |
Visual Benchmark Comparison
GPT-5.6 Luna
Hy4 preview
Agents' Last Exam0.5 vs 0.2
0.5
0.2
Toolathlon0.5 vs 0.7
0.5
0.7
AutomationBench0.1 vs 0.3
0.1
0.3
SWE-Bench Pro0.6 vs 0.7
0.6
0.7
DeepSWE0.7 vs 0.6
0.7
0.6
Terminal-Bench 2.10.8 vs 0.9
0.8
0.9
GPQA0.9 vs 0.9
0.9
0.9
Verdict
Hy4 preview leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.6 Luna — 0.5, Hy4 preview — 0.6.
Recency
Hy4 preview is newer: released 8/28/2026 vs 7/9/2026.
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Frequently Asked Questions
Which is better for coding — GPT-5.6 Luna or Hy4 preview?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.6 Luna or Hy4 preview?
API pricing data is available on the individual model pages.
Which has a larger context window — GPT-5.6 Luna or Hy4 preview?
Context window data is available on the individual model pages.
The GPT-5.6 Luna and Hy4 preview comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.6 Luna or Hy4 preview page. See also the complete list of AI model comparisons.