Head-to-head comparison
Claude Fable 5.1 (Anthropic) and Hy3 (Tencent) 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, Claude Fable 5.1 holds the stronger ModelCap Index position (#2 vs #20); Hy3 is 94.7× cheaper per output token ($0.528/1M vs $50.00/1M); Claude Fable 5.1 offers the longer context window (1M vs 262K tokens); and Hy3 ships open weights.
Evidence: 2 public benchmark observations across 2 boards · 5 public benchmark observations across 5 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.
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Claude Fable 5.1 ranks higher on the ModelCap Index as of 3 September 2026: #2 against #20. 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.
Hy3 is cheaper on output tokens: $0.528/1M against $50.00/1M. Input tokens are $10.00/1M for Claude Fable 5.1 and $0.132/1M for Hy3. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.
Claude Fable 5.1 has the larger context window: 1M tokens against 262K.
AA Terminal-Bench 2.1: Claude Fable 5.1 91.4%, Hy3 64.4% — Claude Fable 5.1 leads.
Claude Fable 5.1: API only. Hy3: Open weights. 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 4 API providers for Claude Fable 5.1 and 6 for Hy3, 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.