Noometry

Model comparison

Claude Opus 5.5 vs MiMo-V2.5

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.4 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 . 20 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

MiMo-V2.5 Xiaomi

43.4

Rank #93 Confirmed

Summary

  • They share 20 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 91.8 to 36.8.
  • 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 Index68.643.4
Released2026-09-222026-04-22
WeightsProprietaryOpen
Context window1M1.05M
Max output128K131K
Input $ / M tokens$4$0.14
Output $ / M tokens$20$0.28
Results tracked4423

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), MiMo-V2.5: 43.9 (#81)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena WebDev18131438
SciCode66.9%43.1%
LMArena Coding15471469
ALE-Bench2,147513.95
FrontierCode54.6%—
CursorBench57.8%—
FrontierSWE62.3%—
MirrorCode77.4%—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), MiMo-V2.5: —

BenchmarkClaude Opus 5.5MiMo-V2.5
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), MiMo-V2.5: 28.6 (#101)

BenchmarkClaude Opus 5.5MiMo-V2.5
CritPt31.7%3.7%
LMArena Hard Prompts15351450
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), MiMo-V2.5: 36.8 (#163)

BenchmarkClaude Opus 5.5MiMo-V2.5
ProofBench100%16%
LMArena Math15061436
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), MiMo-V2.5: 40.8 (#115)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Expert15471460
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 57.8 (#1), MiMo-V2.5: 39.8 (#54)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Vision13211247
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), MiMo-V2.5: 51.9 (#99)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Non-English15071404
LMArena Chinese15881468
LMArena French15141447
LMArena Russian15201395
LMArena Spanish15071416
LMArena German—1421
LMArena Japanese—1306
LMArena Korean—1363

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), MiMo-V2.5: 75.5 (#60)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Instruction Following15371434

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), MiMo-V2.5: 44.2 (#73)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Longer Query15321445

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), MiMo-V2.5: 61.6 (#86)

BenchmarkClaude Opus 5.5MiMo-V2.5
LMArena Text15151428
LMArena Creative Writing15331393
LMArena Multi-Turn14991445
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 68.6 to 43.4 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: 71.9 versus 43.9 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?

20 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and MiMo-V2.5 has 23.

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