Skip to main content
AI Choice Engine

Model comparison

Upstage Solar Pro 4 vs Xiaomi MiMo-V2.6-Pro

Upstage against Xiaomi, compared on context, price, and verified benchmark results.

Catalog record checked September 26, 2026Individual provider fields may changeEvidence confidence: High — see receipts below

Upstage

Upstage Solar Pro 4

Frontier

vs

Xiaomi

Xiaomi MiMo-V2.6-Pro

Frontier · Open weights

AI model capability comparison
SpecificationUpstage Solar Pro 4Xiaomi MiMo-V2.6-Pro
ProviderUpstageXiaomi
TierFrontierFrontier
Context window524KWinner: 1.05M
Max output128KNot verifiedUnverified
Input / 1M tokensWinner: $0.30$0.435
Output / 1M tokens$1.20Winner: $0.87
WeightsClosedOpen
ParametersNot disclosedUnverified1.02T total / 42B active (MoE)
Reasoning levelslow, medium, highNot verifiedUnverified
Modalitiestexttext, image, video, audio
LicenseNot disclosedUnverifiedMIT
API model idsolar-pro4mimo-v2.6-pro
ReleasedAugust 10, 2026September 21, 2026
Artificial Analysis Intelligence Index (2026-09-26)28.2Winner: 46.3
DeepSWE 1.1 (2026-09-21)Not verifiedUnverified71.9
Terminal-Bench 2.1 (2026-09-21)Not verifiedUnverified89.9

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

Where each score comes from, and how far it can be compared across models.

  • 2026-09-26
    Artificial Analysis

    Composite index blending reasoning, knowledge, and coding evals into one 0–100 score.

    Comparable with caveatOnly same-version scores are comparable. v4.3.2 was rebaselined (the top score fell from 66 on v4.1.1 to ~58), so v4.1.1 figures must not be compared with v4.3.2 figures — check measuredAt.

  • 2026-09-21
    Xiaomi MiMo-V2.6 announcement (vendor)

    Agentic software engineering: pass@1 on real repo tasks with reported cost per completed task.

    Directly comparable

Pricing tiers

Upstage Solar Pro 4: List $0.30/$1.20 per MTok; cached input $0.06. The 90%-off launch promo ended 2026-09-10. Closed API. 524K context with up to 128K output.

Xiaomi MiMo-V2.6-Pro: $0.435/$0.87 per MTok (cache hit $0.0036; cache writes free for a limited time) — unchanged from V2.5-Pro. UltraSpeed mode (mimo-v2.6-pro-ultraspeed) costs $4.35/$8.70. Open weights (MIT) as MiMo-V2.6-Pro-RL.

FrontierRecord checked September 26, 2026

Upstage Solar Pro 4

Solar Pro 4 is Upstage's closed flagship with a 524K context at a low $0.30/$1.20 list price.

Best for

  • Long-context
  • Cost-sensitive API
  • Korean + English

Watch out

Closed API; the launch promo has ended, so budget at the $0.30/$1.20 list rate.

FrontierOpen weightsRecord checked September 26, 2026

Xiaomi MiMo-V2.6-Pro

MiMo-V2.6-Pro is Xiaomi's open-weight (MIT) 1.02T MoE with omni-modal input and a 1M context — the top open-weight model on the Artificial Analysis index at under $1 per million output tokens.

Best for

  • Open-weight frontier work
  • Omni-modal input
  • Cheap long-context API

Watch out

Max output is not verified; vendor benchmark claims (DeepSWE 71.9) are not yet independently reproduced.

When the cheaper one wins

Xiaomi MiMo-V2.6-Pro is cheaper on output at $0.87 per million tokens against $1.20 for Upstage Solar Pro 4 — about 1.4×. 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 picker

Evidence 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.
  • 2/5 core specs verified on both sides — Not published for at least one side: max output, parameter count, reasoning levels.
  • 1 shared named benchmark with differing scores — Measured on: Artificial Analysis Intelligence Index.
  • Verified within the last 90 days — Newest catalog check was 2 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.

Related comparisons

Diving deeper on one model? Upstage Solar Pro 4 · Xiaomi MiMo-V2.6-Pro

Common questions

Upstage Solar Pro 4 vs Xiaomi MiMo-V2.6-Pro

Answered from the verified figures on this page rather than general guidance.

Is Upstage Solar Pro 4 or Xiaomi MiMo-V2.6-Pro cheaper for input?
Upstage Solar Pro 4 is cheaper at $0.30 per million input tokens, against $0.435 for Xiaomi MiMo-V2.6-Pro — roughly 1.4× 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; cached input $0.06. The 90%-off launch promo ended 2026-09-10. Closed API. 524K context with up to 128K output. Xiaomi MiMo-V2.6-Pro has tiered pricing: $0.435/$0.87 per MTok (cache hit $0.0036; cache writes free for a limited time) — unchanged from V2.5-Pro. UltraSpeed mode (mimo-v2.6-pro-ultraspeed) costs $4.35/$8.70. Open weights (MIT) as MiMo-V2.6-Pro-RL.
Is Upstage Solar Pro 4 or Xiaomi MiMo-V2.6-Pro cheaper for output?
Xiaomi MiMo-V2.6-Pro is cheaper at $0.87 per million output tokens, against $1.20 for Upstage Solar Pro 4 — roughly 1.4× 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; cached input $0.06. The 90%-off launch promo ended 2026-09-10. Closed API. 524K context with up to 128K output. Xiaomi MiMo-V2.6-Pro has tiered pricing: $0.435/$0.87 per MTok (cache hit $0.0036; cache writes free for a limited time) — unchanged from V2.5-Pro. UltraSpeed mode (mimo-v2.6-pro-ultraspeed) costs $4.35/$8.70. Open weights (MIT) as MiMo-V2.6-Pro-RL.
Which has the larger context window, Upstage Solar Pro 4 or Xiaomi MiMo-V2.6-Pro?
Xiaomi MiMo-V2.6-Pro accepts 1.05M tokens against 524K for Upstage Solar Pro 4. This only matters if you routinely send very long documents or large codebases.
Should I use Upstage Solar Pro 4 or Xiaomi MiMo-V2.6-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-V2.6-Pro suits open-weight frontier work.
Can I self-host Upstage Solar Pro 4 or Xiaomi MiMo-V2.6-Pro?
Xiaomi MiMo-V2.6-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 $0.435 for Xiaomi MiMo-V2.6-Pro — a 1.4x difference at the headline tier.
  • Context: Xiaomi MiMo-V2.6-Pro takes 1.05M against 524K for Upstage Solar Pro 4 — only decisive if your prompts approach the smaller window.
  • Deployment: Xiaomi MiMo-V2.6-Pro publishes weights you can self-host; the other is API-only.
Run the model pickerEstimate stack costAll model comparisons

Choosing a harness rather than a model — Cursor, Copilot, Claude Code, Windsurf, or Lovable? Compare agentic harnesses · Latest releases.