Noometry

Model comparison

Claude Opus 5.5 vs Ministral 8B

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 28.2 on the Noometry Index. Ministral 8B costs 53× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 14 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Ministral 8B Mistral AI

28.2

Rank #325 Confirmed

Summary

  • They share 14 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and Ministral 8B 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 25.7.
  • The biggest single-benchmark swing is GPQA Diamond: 90.6% for Claude Opus 5.5 and 27.1% for Ministral 8B.
  • Ministral 8B is cheaper at $0.15 / $0.15 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 262K.
  • Ministral 8B has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Ministral 8B
ProviderAnthropicMistral AI
Noometry Index68.628.2
Released2026-09-222024-10-01
WeightsProprietaryOpen
Context window1M262K
Max output128K262K
Input $ / M tokens$4$0.15
Output $ / M tokens$20$0.15
Results tracked4417

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Ministral 8B: 35.0 (#230)

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Coding15471202
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), Ministral 8B: 16.4 (#148)

BenchmarkClaude Opus 5.5Ministral 8B
APEX-Agents73.5%—
Berkeley Function Calling Leaderboard—11.1%
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Ministral 8B: 18.4 (#281)

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Hard Prompts15351191
DTBench98.9%45.7%
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Ministral 8B: 25.7 (#267)

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Math15061188
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
MATH Level 5—14.9%
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Ministral 8B: 12.6 (#297)

BenchmarkClaude Opus 5.5Ministral 8B
GPQA Diamond90.6%27.1%
LMArena Expert15471170
SimpleQA Verified72.2%—
Vectara Hallucination Rate—7.4%

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Ministral 8B: —

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Ministral 8B: 35.1 (#247)

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Non-English15071165
LMArena Chinese15881193
LMArena Russian15201195
LMArena French1514—
LMArena Spanish1507—

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Ministral 8B: 60.5 (#250)

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Instruction Following15371161

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Ministral 8B: 36.7 (#227)

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Longer Query15321212

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Ministral 8B: 39.6 (#246)

BenchmarkClaude Opus 5.5Ministral 8B
LMArena Text15151191
LMArena Creative Writing15331175
LMArena Multi-Turn14991166
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Ministral 8B?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 28.2 on the Noometry Index. Ministral 8B costs 53× 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 Ministral 8B?

Ministral 8B is cheaper. It lists at $0.15 per million input tokens and $0.15 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Ministral 8B better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 35.0 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 262K.

How many benchmarks do Claude Opus 5.5 and Ministral 8B share?

14 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Ministral 8B has 17.

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