Noometry

Model comparison

MiMo-V2.5-Pro vs Step 3.5 Flash

MiMo-V2.5-Pro is the stronger model overall, scoring 45.2 to 42.3 on the Noometry Index. Step 3.5 Flash costs 3.6× less per token, which makes it the better buy when MiMo-V2.5-Pro's lead doesn't matter for your workload.

Last verified . 18 shared benchmarks.

MiMo-V2.5-Pro Xiaomi

45.2

Rank #74 Confirmed

Step 3.5 Flash StepFun

42.3

Rank #116 Confirmed

Summary

  • They share 18 benchmarks with published results for both. MiMo-V2.5-Pro scores higher in 7 categories and Step 3.5 Flash in 1 category; 8 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where MiMo-V2.5-Pro leads 65.3 to 58.8.
  • The biggest single-benchmark swing is NYT Connections (extended): 34.4% for MiMo-V2.5-Pro and 28.4% for Step 3.5 Flash.
  • Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.43 / $0.87 for MiMo-V2.5-Pro.
  • MiMo-V2.5-Pro accepts more context: 1.05M tokens versus 256K.

Side by side

MiMo-V2.5-ProStep 3.5 Flash
ProviderXiaomiStepFun
Noometry Index45.242.3
Released2026-04-222026-01-29
WeightsOpenOpen
Context window1.05M256K
Max output131K256K
Input $ / M tokens$0.43$0.10
Output $ / M tokens$0.87$0.30
Results tracked2719

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Category by category

Coding MiMo-V2.5-Pro leads

MiMo-V2.5-Pro: 47.4 (#60), Step 3.5 Flash: 42.4 (#105)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
LMArena Coding15031436
LMArena WebDev1479—
SciCode50.2%—
ALE-Bench899.8—

Reasoning MiMo-V2.5-Pro leads

MiMo-V2.5-Pro: 26.8 (#130), Step 3.5 Flash: 22.2 (#202)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
NYT Connections (extended)34.4%28.4%
LMArena Hard Prompts14881411
CritPt4%—
DTBench84.5%—
LMCA29.5%—

Math Step 3.5 Flash leads

MiMo-V2.5-Pro: 40.0 (#96), Step 3.5 Flash: 42.6 (#84)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
LMArena Math14811408
MathArena Final-Answer Competitions—66.8%
ProofBench22%—

Knowledge MiMo-V2.5-Pro leads

MiMo-V2.5-Pro: 42.2 (#98), Step 3.5 Flash: 39.6 (#132)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
LMArena Expert15031421

Multilingual MiMo-V2.5-Pro leads

MiMo-V2.5-Pro: 55.1 (#34), Step 3.5 Flash: 50.5 (#119)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
LMArena Non-English14491385
LMArena Chinese15071447
LMArena French14881421
LMArena German14581405
LMArena Japanese14121354
LMArena Korean14371352
LMArena Russian14501385
LMArena Spanish14711419

Instruction Following MiMo-V2.5-Pro leads

MiMo-V2.5-Pro: 77.5 (#21), Step 3.5 Flash: 73.1 (#124)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
LMArena Instruction Following14771385

Long Context MiMo-V2.5-Pro leads

MiMo-V2.5-Pro: 45.4 (#37), Step 3.5 Flash: 42.8 (#117)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
LMArena Longer Query14831402

Writing & Preference MiMo-V2.5-Pro leads

MiMo-V2.5-Pro: 65.3 (#49), Step 3.5 Flash: 58.8 (#113)

BenchmarkMiMo-V2.5-ProStep 3.5 Flash
LMArena Text14651403
LMArena Creative Writing14401357
LMArena Multi-Turn14771405
EQ-Bench Creative Writing1493—
EQ-Bench 41208—

Frequently asked questions

Is MiMo-V2.5-Pro better than Step 3.5 Flash?

MiMo-V2.5-Pro is the stronger model overall, scoring 45.2 to 42.3 on the Noometry Index. Step 3.5 Flash costs 3.6× less per token, which makes it the better buy when MiMo-V2.5-Pro's lead doesn't matter for your workload.

Which is cheaper, MiMo-V2.5-Pro or Step 3.5 Flash?

Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; MiMo-V2.5-Pro lists at $0.43 and $0.87.

Is MiMo-V2.5-Pro or Step 3.5 Flash better for coding?

MiMo-V2.5-Pro scores higher on coding benchmarks: 47.4 versus 42.4 in the Noometry coding category.

Which has the bigger context window?

MiMo-V2.5-Pro does, with 1.05M tokens against 256K.

How many benchmarks do MiMo-V2.5-Pro and Step 3.5 Flash share?

18 benchmarks have published results for both models. MiMo-V2.5-Pro has 27 scored results on Noometry and Step 3.5 Flash has 19.

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