Head-to-head comparison
Hy4 preview (Tencent) and Grok 4.20 Multi-Agent (xAI) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.
Snapshot as of 3 September 2026
As of 3 September 2026, Grok 4.20 Multi-Agent holds the stronger ModelCap Index position (#12 vs #19); Grok 4.20 Multi-Agent is cheaper per output token ($2.50/1M vs $2.50/1M); Grok 4.20 Multi-Agent offers the longer context window (2M vs 1M tokens); and Hy4 preview ships open weights.
Evidence: placed against measured peers on publisher-reported benchmarks, discounted for self-report optimism; floored directly above its measured family predecessor · 2 public benchmark observations across 2 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.
Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.
Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.
Grok 4.20 Multi-Agent ranks higher on the ModelCap Index as of 3 September 2026: #12 against #19. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.
Grok 4.20 Multi-Agent is cheaper on output tokens: $2.50/1M against $2.50/1M. Input tokens are $0.834/1M for Hy4 preview and $1.25/1M for Grok 4.20 Multi-Agent. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.
Grok 4.20 Multi-Agent has the larger context window: 2M tokens against 1M.
The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.
Hy4 preview: Open weights. Grok 4.20 Multi-Agent: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.
ModelCap currently lists 1 API provider for Hy4 preview and 1 for Grok 4.20 Multi-Agent, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.
Every figure comes from the sealed ModelCap dataset published 3 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.