Head-to-head comparison
Solar Open2 250B (Upstage) and MiMo V2 Flash (XiaomiMiMo) 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 13 September 2026
As of 13 September 2026, MiMo V2 Flash holds the stronger ModelCap Index position (#48 vs #51); and MiMo V2 Flash ships open weights.
Evidence: publisher-corpus-prior over 186 held-out anchors (23%); launch card against 2 resolved peers on 4 rows (77%); exceeds every named peer on 4 of 4 rows; no cross-lab optimism probe available; shrunk 5.9 toward the measured corpus · global-corpus-prior over 186 held-out anchors (14%); launch card against 4 resolved peers on 10 rows (86%); exceeds every named peer on 1 of 10 rows; optimism haircut 0 from cross-lab-probe; shrunk 1.5 toward the measured corpus. 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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MiMo V2 Flash ranks higher on the ModelCap Index as of 13 September 2026: #48 against #51. 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. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.
At least one of the two has no listed API price on ModelCap right now, so no price comparison is made.
Both publish a —-token context window.
AA Terminal-Bench 2.1: Solar Open2 250B 44.2%, MiMo V2 Flash 61.8% — MiMo V2 Flash leads.
Solar Open2 250B: Restricted license. MiMo V2 Flash: 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 0 API providers for Solar Open2 250B and 0 for MiMo V2 Flash, 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 13 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.