GPT-6.1 Sol vs Hy4 preview: Specs & Benchmark Comparison
GPT-6.1 Sol is developed by OpenAI, while Hy4 preview comes from Tencent. Hy4 preview was released in August 2026, and GPT-6.1 Sol 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-6.1 Sol.
We have 10 benchmark results for GPT-6.1 Sol and 32 benchmark results for Hy4 preview, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
GPT-6.1 Sol is available through an API at $2 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-6.1 Sol | Hy4 preview |
|---|---|---|
| Company | OpenAI | Tencent |
| Release Date | September 29, 2026 | August 28, 2026 |
| Parameters | — | 770B |
| Multimodal | Yes | No |
| Context (input) | 1.1M | — |
| Context (output) | 128K | — |
| Input Price / 1M | $2.00 | — |
| Output Price / 1M | $10.00 | — |
| Average Score | 58.5% | 58.7% |
Verdict
GPT-6.1 Sol leads in 1 out of 2 comparison categories.
Both models show comparable average scores: GPT-6.1 Sol — 0.6, Hy4 preview — 0.6.
GPT-6.1 Sol is newer: released 9/29/2026 vs 8/28/2026.
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Frequently Asked Questions
Which is better for coding — GPT-6.1 Sol or Hy4 preview?
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Which has a larger context window — GPT-6.1 Sol or Hy4 preview?
The GPT-6.1 Sol 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-6.1 Sol or Hy4 preview page. See also the complete list of AI model comparisons.