Vals benchmarked Tencent Hy4 Preview at #21 of 58 on the Vals Index (55.4%) and #4 among open-weight models at about $1.28 per test. It is the cheapest top-ten model on Code Migration (47.4%) versus much costlier Muse Spark and Opus 4.8 runs, leads open-weight models on three agentic benches, and ships with a 1M context window and 64k max output tokens.

Key Takeaways

  • โœ“#21 of 58 on Vals Index (55.4%) and #4 open-weight at roughly $1.28 per test, below median cost on most benches.
  • โœ“Code Migration 47.4% lands in the top ten at about $3.41 per test versus ~$14.21 Muse Spark and ~$30.51 Opus 4.8.
  • โœ“Top open-weight on three agentic benchmarks; 1M context and 64k max output; weaker on terminal work (~55% Terminal-Bench 2.1).
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