Noometry

Model comparison

Claude Opus 5.5 vs Mistral Nemo

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 26.4 on the Noometry Index. Mistral Nemo 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 . 4 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Mistral Nemo Mistral AI

26.4

Rank #337 Confirmed

Summary

  • They share 4 benchmarks with published results for both. Claude Opus 5.5 scores higher in 5 categories and Mistral Nemo in 0 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 25.5.
  • The biggest single-benchmark swing is GPQA Diamond: 90.6% for Claude Opus 5.5 and 29.9% for Mistral Nemo.
  • Mistral Nemo 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 128K.
  • Mistral Nemo has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Mistral Nemo
ProviderAnthropicMistral AI
Noometry Index68.626.4
Released2026-09-222024-07-01
WeightsProprietaryOpen
Context window1M128K
Max output128K128K
Input $ / M tokens$4$0.15
Output $ / M tokens$20$0.15
Results tracked4410

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Category by category

Coding Not comparable

Claude Opus 5.5: 71.9 (#3), Mistral Nemo: —

BenchmarkClaude Opus 5.5Mistral Nemo
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
LMArena Coding1547—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), Mistral Nemo: 23.5 (#125)

BenchmarkClaude Opus 5.5Mistral Nemo
APEX-Agents73.5%—
Berkeley Function Calling Leaderboard—27.6%
BALROG—17.6%
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Mistral Nemo: 20.7 (#232)

BenchmarkClaude Opus 5.5Mistral Nemo
DTBench98.9%48.6%
Epoch Capabilities Index167.33118.68
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
LMArena Hard Prompts1535—
Mystery Game Puzzles71%—
LMCA68.2%—
PIQA—83.5%

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Mistral Nemo: 25.5 (#268)

BenchmarkClaude Opus 5.5Mistral Nemo
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1506—
MATH Level 5—10.8%
FrontierMath Erdős2.9%—
GSM8K—84.2%

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Mistral Nemo: 12.3 (#298)

BenchmarkClaude Opus 5.5Mistral Nemo
GPQA Diamond90.6%29.9%
SimpleQA Verified72.2%—
LMArena Expert1547—
BoolQ—82.5%

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Mistral Nemo: —

BenchmarkClaude Opus 5.5Mistral Nemo
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.1 (#2), Mistral Nemo: —

BenchmarkClaude Opus 5.5Mistral Nemo
LMArena Non-English1507—
LMArena Chinese1588—
LMArena French1514—
LMArena Russian1520—
LMArena Spanish1507—

Instruction Following Not comparable

Claude Opus 5.5: 80.0 (#3), Mistral Nemo: —

BenchmarkClaude Opus 5.5Mistral Nemo
LMArena Instruction Following1537—

Long Context Not comparable

Claude Opus 5.5: 47.1 (#19), Mistral Nemo: —

BenchmarkClaude Opus 5.5Mistral Nemo
LMArena Longer Query1532—

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Mistral Nemo: 28.5 (#296)

BenchmarkClaude Opus 5.5Mistral Nemo
EQ-Bench Creative Writing2050881
LMArena Text1515—
LMArena Creative Writing1533—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5.5 better than Mistral Nemo?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 26.4 on the Noometry Index. Mistral Nemo 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 Mistral Nemo?

Mistral Nemo 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.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 128K.

How many benchmarks do Claude Opus 5.5 and Mistral Nemo share?

4 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Mistral Nemo has 10.

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