Claude Haiku 5.5 vs Hy4 preview: Specs & Benchmark Comparison
Claude Haiku 5.5 is developed by Anthropic, while Hy4 preview comes from Tencent. Hy4 preview was released in August 2026, and Claude Haiku 5.5 followed 2 months later in October 2026. Hy4 preview has a published size of about 770 billion parameters; Anthropic has not disclosed the parameter count of Claude Haiku 5.5.
The two models share 5 published benchmarks. Claude Haiku 5.5 leads on 3 of them, Hy4 preview on 2. The widest gaps are on Program Bench, where Claude Haiku 5.5 scores 82.0% against 17.5%; OfficeQA Pro, where Hy4 preview scores 66.2% against 60.3%. Averaged across everything we track, Claude Haiku 5.5 sits at 57.7% and Hy4 preview at 58.7%.
Claude Haiku 5.5 is available through an API at $0.10 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 | Claude Haiku 5.5 | Hy4 preview |
|---|---|---|
| Company | Anthropic | Tencent |
| Release Date | October 7, 2026 | August 28, 2026 |
| Parameters | — | 770B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | — |
| Context (output) | 128K | — |
| Input Price / 1M | $0.10 | — |
| Output Price / 1M | $0.50 | — |
| Average Score | 57.7% | 58.7% |
| Benchmarks | ||
| Program Bench | 82.0% | 17.5% |
| OfficeQA Pro | 60.3% | 66.2% |
| Humanity's Last Exam (no tools, text-only) | 45.9% | 43.4% |
| SWE-Bench Pro | 64.8% | 65.7% |
| SWE-bench Multilingual | 83.7% | 82.9% |
Visual Benchmark Comparison
Verdict
Claude Haiku 5.5 leads in 1 out of 2 comparison categories.
Both models show comparable average scores: Claude Haiku 5.5 — 0.6, Hy4 preview — 0.6.
Claude Haiku 5.5 is newer: released 10/7/2026 vs 8/28/2026.
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Frequently Asked Questions
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The Claude Haiku 5.5 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 Claude Haiku 5.5 or Hy4 preview page. See also the complete list of AI model comparisons.