Model comparison
Upstage Solar Pro 4 vs Xiaomi MiMo-V2.5-Pro
Upstage against Xiaomi, compared on context, price, and verified benchmark results.
Catalog record checked September 2, 2026Individual provider fields may changeEvidence confidence: High — see receipts below
Upstage
Upstage Solar Pro 4
Frontier
Xiaomi
Xiaomi MiMo-V2.5-Pro
Frontier · Open weights
| Specification | Upstage Solar Pro 4 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| Provider | Upstage | Xiaomi |
| Tier | Frontier | Frontier |
| Context window | 524K | Winner: 1M |
| Max output | Not verifiedUnverified | Not verifiedUnverified |
| Input / 1M tokens | Winner: $0.30 | $1 |
| Output / 1M tokens | Winner: $1.20 | $3 |
| Weights | Closed | Open |
| Parameters | Not disclosedUnverified | 1.02T total / 42B active (MoE) |
| Reasoning levels | low, medium, high | low, high, max |
| Modalities | text | text, image |
| License | Not disclosedUnverified | MIT |
| API model id | solar-pro-4 | mimo-v2-5-pro |
| Released | August 10, 2026 | April 22, 2026 |
| Artificial Analysis Intelligence Index (2026-08-14) | 50 | Winner: 52 |
Prices are USD per million tokens at standard rates, excluding batch and caching discounts. Bold indicates the better figure where one is objectively better. Values we could not confirm from the provider are shown as “Not verified” rather than estimated.
Benchmark receipts
- 2026-08-14: Artificial AnalysisComposite index blending reasoning, knowledge, and coding evals into one 0–100 score. Comparability: directly comparable — AA occasionally rebaselines the index scale between snapshots — a score captured on one date is only comparable to same-snapshot scores (check measuredAt).
Pricing tiers: Upstage Solar Pro 4: List $0.30/$1.20 per MTok; live promo rate is $0.03/$0.12 (90% off through 2026-09-10). Closed API. 524K context. · Xiaomi MiMo-V2.5-Pro: $1.00/$3.00 per MTok up to 256K prompt; $2.00/$6.00 above 256K (to 1M). Open weights (MIT). 1.02T/42B active MoE, native multimodal.
Upstage Solar Pro 4
Solar Pro 4 is Upstage's closed flagship with a 524K context at a low launch price.
Best for
- Long-context
- Cost-sensitive API
- Korean + English
Watch out
Closed API; promo pricing may end.
Xiaomi MiMo-V2.5-Pro
MiMo-V2.5-Pro is Xiaomi's open-weight (MIT) 1.02T MoE with native multimodal and a 1M context.
Best for
- Open-weight frontier
- Multimodal
- Long-context
Watch out
Verify weights/pricing on your endpoint.
When the cheaper one wins
Upstage Solar Pro 4 is cheaper on output at $1.20 per million tokens against $3 for Xiaomi MiMo-V2.5-Pro — about 2.5×. Use the cheaper tier for classification, extraction, summarisation, and any task where the expensive model’s extra score does not change the accepted output. The expensive one only pays if your hardest task actually fails on the cheap tier. These are standard-tier API rates, excluding batch and cache discounts.
Run the model pickerEvidence confidence: High
How strong and complete the evidence behind this comparison is — not a prediction of which model is better.
- Pricing verified on both sides — Input and output rates are verified for both models.
- 3/5 core specs verified on both sides — Not published for at least one side: max output, parameter count.
- 1 shared named benchmark with differing scores — Measured on: Artificial Analysis Intelligence Index.
- Verified within the last 90 days — Newest catalog check was 9 days ago.
- Both models carry source citations — Each side has at least two catalog sources on record.
Source receipts
Each catalog figure was checked against the provider or an independent second source on the date shown.
- Upstage Solar Pro 4: Upstage — Solar Pro 4 (accessed 2026-08-29)
- Upstage Solar Pro 4: Upstage (accessed 2026-08-29)
- Xiaomi MiMo-V2.5-Pro: Xiaomi — MiMo V2.5 (accessed 2026-08-29)
- Xiaomi MiMo-V2.5-Pro: Xiaomi MiMo (accessed 2026-08-29)
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Diving deeper on one model? Upstage Solar Pro 4 · Xiaomi MiMo-V2.5-Pro
Common questions
Upstage Solar Pro 4 vs Xiaomi MiMo-V2.5-Pro
Answered from the verified figures on this page rather than general guidance.
Is Upstage Solar Pro 4 or Xiaomi MiMo-V2.5-Pro cheaper for input?
Upstage Solar Pro 4 is cheaper at $0.30 per million input tokens, against $1 for Xiaomi MiMo-V2.5-Pro — roughly 3.3× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Upstage Solar Pro 4 has tiered pricing: List $0.30/$1.20 per MTok; live promo rate is $0.03/$0.12 (90% off through 2026-09-10). Closed API. 524K context. Xiaomi MiMo-V2.5-Pro has tiered pricing: $1.00/$3.00 per MTok up to 256K prompt; $2.00/$6.00 above 256K (to 1M). Open weights (MIT). 1.02T/42B active MoE, native multimodal.
Is Upstage Solar Pro 4 or Xiaomi MiMo-V2.5-Pro cheaper for output?
Upstage Solar Pro 4 is cheaper at $1.20 per million output tokens, against $3 for Xiaomi MiMo-V2.5-Pro — roughly 2.5× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Upstage Solar Pro 4 has tiered pricing: List $0.30/$1.20 per MTok; live promo rate is $0.03/$0.12 (90% off through 2026-09-10). Closed API. 524K context. Xiaomi MiMo-V2.5-Pro has tiered pricing: $1.00/$3.00 per MTok up to 256K prompt; $2.00/$6.00 above 256K (to 1M). Open weights (MIT). 1.02T/42B active MoE, native multimodal.
Which has the larger context window, Upstage Solar Pro 4 or Xiaomi MiMo-V2.5-Pro?
Xiaomi MiMo-V2.5-Pro accepts 1M tokens against 524K for Upstage Solar Pro 4. This only matters if you routinely send very long documents or large codebases.
Do Upstage Solar Pro 4 and Xiaomi MiMo-V2.5-Pro support the same reasoning levels?
Upstage Solar Pro 4 exposes low, medium, high, while Xiaomi MiMo-V2.5-Pro exposes low, high, max.
Should I use Upstage Solar Pro 4 or Xiaomi MiMo-V2.5-Pro?
Both sit in the frontier tier, so the choice usually comes down to price and context rather than capability. Upstage Solar Pro 4 suits long-context; Xiaomi MiMo-V2.5-Pro suits open-weight frontier.
Can I self-host Upstage Solar Pro 4 or Xiaomi MiMo-V2.5-Pro?
Xiaomi MiMo-V2.5-Pro publishes open weights, but self-hosting and third-party provider access depend on the licence, hardware, serving support, and availability. Upstage Solar Pro 4 is a closed model whose supported access paths are controlled by its provider.
Next step
Choosing between them
The verified figures that separate this pair, computed from the catalog rather than restated boilerplate.
- Input price: Upstage Solar Pro 4 costs $0.30 per 1M tokens versus $1 for Xiaomi MiMo-V2.5-Pro — a 3.3x difference at the headline tier.
- Context: Xiaomi MiMo-V2.5-Pro takes 1M against 524K for Upstage Solar Pro 4 — only decisive if your prompts approach the smaller window.
- Measured capability: Xiaomi MiMo-V2.5-Pro leads Artificial Analysis Intelligence Index 52 to 50 (measured 2026-08-14).
- Deployment: Xiaomi MiMo-V2.5-Pro publishes weights you can self-host; the other is API-only.
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