Head-to-head comparison
Sonar Pro (Perplexity) and Grok Build 0.1 (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 19 August 2026
As of 19 August 2026, Sonar Pro holds the stronger ModelCap Index position (#202 vs #203); Grok Build 0.1 is 7.5× cheaper per output token ($2.00/1M vs $15.00/1M); and Grok Build 0.1 offers the longer context window (256K vs 200K tokens).
Evidence: 1 public benchmark observation across 1 board · 1 public benchmark observation across 1 board. 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.
Sonar Pro ranks higher on the ModelCap Index as of 19 August 2026: #202 against #203. 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 Build 0.1 is cheaper on output tokens: $2.00/1M against $15.00/1M. Input tokens are $3.00/1M for Sonar Pro and $1.00/1M for Grok Build 0.1. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.
Grok Build 0.1 has the larger context window: 256K tokens against 200K.
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.
Sonar Pro: API only. Grok Build 0.1: 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 Sonar Pro and 1 for Grok Build 0.1, 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 19 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.