Noometry

Model comparison

Claude Opus 5.5 vs MiMo-V2.5

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 43.0 on the Noometry Index. MiMo-V2.5 costs 46× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 15 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

MiMo-V2.5 Xiaomi

43.0

Rank #89 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and MiMo-V2.5 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 35.4.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Opus 5.5 and 16% for MiMo-V2.5.
  • MiMo-V2.5 is cheaper at $0.14 / $0.28 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • MiMo-V2.5 accepts more context: 1.05M tokens versus 1M.
  • MiMo-V2.5 has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5MiMo-V2.5
ProviderAnthropicXiaomi
Noometry Index68.543.0
Released2026-09-222026-04-22
WeightsProprietaryOpen
Context window1M1.05M
Max output128K131K
Input $ / M tokens$4$0.14
Output $ / M tokens$20$0.28
Results tracked3523

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), MiMo-V2.5: 43.6 (#75)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena WebDev18201438
SciCode66.9%43.1%
LMArena Coding15451469
FrontierCode54.4%—
CursorBench57.8%—
FrontierSWE62.3%—
MirrorCode77.4%—
ALE-Bench—513.95

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#13), MiMo-V2.5: —

BenchmarkClaude Opus 5.5MiMo-V2.5
APEX-Agents73.5%—
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), MiMo-V2.5: 27.8 (#98)

BenchmarkClaude Opus 5.5MiMo-V2.5
CritPt31.7%3.7%
LMArena Hard Prompts15451450
ARC-AGI-292.5%—
NYT Connections (extended)88.5%—
ARC-AGI-197.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), MiMo-V2.5: 35.4 (#145)

BenchmarkClaude Opus 5.5MiMo-V2.5
ProofBench100%16%
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
LMArena Math—1436

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.6 (#9), MiMo-V2.5: 40.2 (#109)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Expert15641459
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 56.5 (#2), MiMo-V2.5: 39.0 (#53)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Vision—1245
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), MiMo-V2.5: 52.0 (#96)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Non-English15131404
LMArena Chinese15721467
LMArena Russian15321395
LMArena French—1447
LMArena German—1421
LMArena Japanese—1304
LMArena Korean—1363
LMArena Spanish—1412

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), MiMo-V2.5: 75.7 (#55)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Instruction Following15351433

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), MiMo-V2.5: 44.1 (#69)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Longer Query15401444

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), MiMo-V2.5: 61.8 (#82)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Text15181427
LMArena Creative Writing15381392
LMArena Multi-Turn15201445
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than MiMo-V2.5?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 43.0 on the Noometry Index. MiMo-V2.5 costs 46× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or MiMo-V2.5?

MiMo-V2.5 is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or MiMo-V2.5 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 43.6 in the Noometry coding category.

Which has the bigger context window?

MiMo-V2.5 does, with 1.05M tokens against 1M.

How many benchmarks do Claude Opus 5.5 and MiMo-V2.5 share?

15 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and MiMo-V2.5 has 23.

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