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AI Choice Engine

Model comparison

GPT-5.6 Sol vs Xiaomi MiMo-V2.6-Pro

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

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

OpenAI

GPT-5.6 Sol

Frontier

vs

Xiaomi

Xiaomi MiMo-V2.6-Pro

Frontier · Open weights

AI model capability comparison
SpecificationGPT-5.6 SolXiaomi MiMo-V2.6-Pro
ProviderOpenAIXiaomi
TierFrontierFrontier
Context windowWinner: 1.05M1.05M
Max output128KNot verifiedUnverified
Input / 1M tokens$4Winner: $0.435
Output / 1M tokens$20Winner: $0.87
WeightsClosedOpen
Parametersprevious-generation reasoning + coding model1.02T total / 42B active (MoE)
Reasoning levelsnone, low, medium, high, xhigh, maxNot verifiedUnverified
Modalitiestext, imagetext, image, video, audio
LicenseNot disclosedUnverifiedMIT
API model idgpt-5.6-solmimo-v2.6-pro
ReleasedJuly 9, 2026September 21, 2026
Artificial Analysis Intelligence Index [max] (2026-09-26)47Not verifiedUnverified
Artificial Analysis Intelligence Index (2026-09-26)Not verifiedUnverified46.3
Terminal-Bench 2.1 (2026-07-09)88.8Winner: 89.9
GPQA Diamond (2026-07-09)94.6Not verifiedUnverified
DeepSWE 1.1 (2026-09-21)Not verifiedUnverified71.9

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

  • 2026-07-09
    OpenAI — GPT-5.6 evals table (vendor)

    Agentic terminal work: multi-step tasks executed in a sandboxed shell environment.

    Comparable with caveatNot comparable with Terminal-Bench 3.0 or 4.0 (different task sets) or v1; harness configuration (container, time limits) also shifts results.

Pricing tiers

GPT-5.6 Sol: Launch list was $5/$30; cut to $4/$20 on 2026-08-21, promo held at least through 2026-11-21. Above 272K input the whole request bills 2x input / 1.5x output ($8/$30). Cached input $0.40/MTok; cache writes 1.25x input; batch $2/$10. Knowledge cutoff Feb 16 2026.

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

GPT-5.6 Sol

GPT-5.6 Sol was OpenAI's GPT-5.6 flagship for complex reasoning and coding with a 1.05M-token context — superseded on 2026-09-22 by GPT-6 Sol at half the price.

Best for

  • Complex reasoning
  • Agentic coding
  • Hard knowledge work

Watch out

Superseded: GPT-6 Sol lists $2/$10, half this row's $4/$20 promo rate, and scores higher on the Artificial Analysis index. Still served; 'max' effort and 'ultra' multi-agent mode multiply token use.

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 $20 for GPT-5.6 Sol — about 23×. 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: Medium

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, reasoning levels.
  • 2 shared named benchmarks (scores match) — Measured on: Artificial Analysis Intelligence Index, Terminal-Bench 2.1 — scores are equivalent, so the benchmark does not separate the pair.
  • 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? GPT-5.6 Sol · Xiaomi MiMo-V2.6-Pro

Common questions

GPT-5.6 Sol vs Xiaomi MiMo-V2.6-Pro

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

Is GPT-5.6 Sol or Xiaomi MiMo-V2.6-Pro cheaper for input?
Xiaomi MiMo-V2.6-Pro is cheaper at $0.435 per million input tokens, against $4 for GPT-5.6 Sol — roughly 9.2× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; GPT-5.6 Sol has tiered pricing: Launch list was $5/$30; cut to $4/$20 on 2026-08-21, promo held at least through 2026-11-21. Above 272K input the whole request bills 2x input / 1.5x output ($8/$30). Cached input $0.40/MTok; cache writes 1.25x input; batch $2/$10. Knowledge cutoff Feb 16 2026. 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 GPT-5.6 Sol or Xiaomi MiMo-V2.6-Pro cheaper for output?
Xiaomi MiMo-V2.6-Pro is cheaper at $0.87 per million output tokens, against $20 for GPT-5.6 Sol — roughly 23× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; GPT-5.6 Sol has tiered pricing: Launch list was $5/$30; cut to $4/$20 on 2026-08-21, promo held at least through 2026-11-21. Above 272K input the whole request bills 2x input / 1.5x output ($8/$30). Cached input $0.40/MTok; cache writes 1.25x input; batch $2/$10. Knowledge cutoff Feb 16 2026. 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, GPT-5.6 Sol or Xiaomi MiMo-V2.6-Pro?
Both accept about 1.05M tokens of context, so document length will not decide between them.
Should I use GPT-5.6 Sol 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. GPT-5.6 Sol suits complex reasoning; Xiaomi MiMo-V2.6-Pro suits open-weight frontier work.
Can I self-host GPT-5.6 Sol 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. GPT-5.6 Sol 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: Xiaomi MiMo-V2.6-Pro costs $0.435 per 1M tokens versus $4 for GPT-5.6 Sol — a 9.2x difference at the headline tier.
  • Context: GPT-5.6 Sol takes 1.05M against 1.05M for Xiaomi MiMo-V2.6-Pro — only decisive if your prompts approach the smaller window.
  • Measured capability: GPT-5.6 Sol leads Artificial Analysis Intelligence Index 47 to 46.3 (measured 2026-09-26).
  • Deployment: Xiaomi MiMo-V2.6-Pro publishes weights you can self-host; the other is API-only.
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