Head-to-head comparison
Reka Flash 3 (Reka) and Fugu Ultra (Sakana AI) 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 18 August 2026
As of 18 August 2026, Fugu Ultra holds the stronger ModelCap Index position (#159 vs #226); Reka Flash 3 is 150× cheaper per output token ($0.20/1M vs $30.00/1M); Fugu Ultra offers the longer context window (1M vs 66K tokens); and Reka Flash 3 ships open weights.
Evidence: 1 public benchmark observation across 1 board · global corpus prior · leave-one-anchor-out calibrated. 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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Fugu Ultra ranks higher on the ModelCap Index as of 18 August 2026: #159 against #226. 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.
Reka Flash 3 is cheaper on output tokens: $0.20/1M against $30.00/1M. Input tokens are $0.10/1M for Reka Flash 3 and $5.00/1M for Fugu Ultra. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.
Fugu Ultra has the larger context window: 1M tokens against 66K.
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.
Reka Flash 3: Open weights. Fugu Ultra: 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 Reka Flash 3 and 1 for Fugu Ultra, 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 18 August 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.