GPT-6 Astra vs Hy4 preview: Specs & Benchmark Comparison
GPT-6 Astra is developed by OpenAI, while Hy4 preview comes from Tencent. Hy4 preview was released in August 2026, and GPT-6 Astra followed a month later in September 2026. Hy4 preview has a published size of about 770 billion parameters; OpenAI has not disclosed the parameter count of GPT-6 Astra.
The two models share 4 published benchmarks. GPT-6 Astra leads on 4 of them. The widest gaps are on Agents' Last Exam, where GPT-6 Astra scores 59.3% against 22.8%; AutomationBench, where GPT-6 Astra scores 41.4% against 32.1%. Averaged across everything we track, GPT-6 Astra sits at 74.4% and Hy4 preview at 58.7%.
GPT-6 Astra is available through an API at $10 per million input tokens with a 1M-token context window. We do not track a hosted API for Hy4 preview, so pricing and context cannot be compared directly.
| Characteristic | GPT-6 Astra | Hy4 preview |
|---|---|---|
| Company | OpenAI | Tencent |
| Release Date | September 4, 2026 | August 28, 2026 |
| Parameters | — | 770B |
| Multimodal | Yes | No |
| Context (input) | 1.1M | — |
| Context (output) | 128K | — |
| Input Price / 1M | $10.00 | — |
| Output Price / 1M | $50.00 | — |
| Average Score | 74.4% | 58.7% |
| Benchmarks | ||
| Agents' Last Exam | 59.3% | 22.8% |
| AutomationBench | 41.4% | 32.1% |
| GPQA Diamond | 96.0% | 92.3% |
| Humanity's Last Exam (with tools, text-only) | 57.2% | 55.4% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: GPT-6 Astra — 0.7, Hy4 preview — 0.6.
Both models were released around the same time: 9/4/2026 and 8/28/2026.
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Frequently Asked Questions
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The GPT-6 Astra 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-6 Astra or Hy4 preview page. See also the complete list of AI model comparisons.