Grok 4.5 vs Hy4 preview: Specs & Benchmark Comparison
Grok 4.5 is developed by xAI, while Hy4 preview comes from Tencent. Grok 4.5 was released in July 2026, and Hy4 preview followed a month later in August 2026. Hy4 preview has a published size of about 770 billion parameters; xAI has not disclosed the parameter count of Grok 4.5.
The two models share 5 published benchmarks. Hy4 preview leads on 4 of them, Grok 4.5 on 1. The widest gaps are on DeepSWE, where Hy4 preview scores 64.3% against 53.0%; SWE-Marathon, where Hy4 preview scores 31.9% against 29.0%. Averaged across everything we track, Grok 4.5 sits at 52.9% and Hy4 preview at 58.7%.
Grok 4.5 is available through an API at $2 per million input tokens with a 500K-token context window. We do not track a hosted API for Hy4 preview, so pricing and context cannot be compared directly.
| Characteristic | Grok 4.5 | Hy4 preview |
|---|---|---|
| Company | xAI | Tencent |
| Release Date | July 16, 2026 | August 28, 2026 |
| Parameters | — | 770B |
| Multimodal | Yes | No |
| Context (input) | 500K | — |
| Input Price / 1M | $2.00 | — |
| Output Price / 1M | $6.00 | — |
| Average Score | 52.9% | 58.7% |
| Benchmarks | ||
| DeepSWE | 53.0% | 64.3% |
| SWE-Marathon | 29.0% | 31.9% |
| Terminal-Bench 2.1 | 83.0% | 85.4% |
| GPQA | 93.0% | 92.3% |
| SWE-Bench Pro | 65.0% | 65.7% |
Visual Benchmark Comparison
Verdict
Hy4 preview leads in 1 out of 2 comparison categories.
Both models show comparable average scores: Grok 4.5 — 0.5, Hy4 preview — 0.6.
Hy4 preview is newer: released 8/28/2026 vs 7/16/2026.
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Frequently Asked Questions
Which is better for coding — Grok 4.5 or Hy4 preview?
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The Grok 4.5 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 Grok 4.5 or Hy4 preview page. See also the complete list of AI model comparisons.