Noometry

Model comparison

Claude Opus 4.5 vs Mistral Medium 3.5

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 39.6 on the Noometry Index. Mistral Medium 3.5 costs 3.3× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Last verified . 20 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #39 Confirmed

Mistral Medium 3.5 Mistral AI

39.6

Rank #151 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Claude Opus 4.5 scores higher in 8 categories and Mistral Medium 3.5 in 1 category; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 4.5 leads 42.5 to 16.6.
  • The biggest single-benchmark swing is NYT Connections (extended): 52.5% for Claude Opus 4.5 and 12.9% for Mistral Medium 3.5.
  • Mistral Medium 3.5 is cheaper at $1.50 / $7.50 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • Mistral Medium 3.5 accepts more context: 262K tokens versus 200K.
  • Mistral Medium 3.5 has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4.5Mistral Medium 3.5
ProviderAnthropicMistral AI
Noometry Index50.539.6
Released2025-11-01—
WeightsProprietaryOpen
Context window200K262K
Max output64K210K
Input $ / M tokens$5$1.50
Output $ / M tokens$25$7.50
Results tracked6922

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 55.4 (#21), Mistral Medium 3.5: 35.7 (#208)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena WebDev14931263
LMArena Coding15041461
SWE-bench Verified76.7%—
SWE-bench Verified (bash only)76.8%—
SWE-bench Multilingual70.7%—
GSO26.5%—
WeirdML63.7%—
ALE-Bench1,025—
AlgoTune1.77—

Agentic & Tool Use Not comparable

Claude Opus 4.5: 47.2 (#11), Mistral Medium 3.5: —

BenchmarkClaude Opus 4.5Mistral Medium 3.5
Terminal-Bench63.1%—
Berkeley Function Calling Leaderboard77.5%—
GDPval45.5%—
Remote Labor Index3.8%—
τ²-bench Airline84%—
τ²-bench Banking24.7%—
τ²-bench Retail79.6%—
τ²-bench Telecom92.3%—
Cybench82%—
DeepResearch Bench54.8%—
OSWorld66.3%—
BALROG43.5%—
LMArena Search1180—
METR Time Horizons75%—
Vending-Bench 24,967—

Reasoning Claude Opus 4.5 leads

Claude Opus 4.5: 42.5 (#43), Mistral Medium 3.5: 16.6 (#290)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
Kagi LLM Benchmark80.2%41.4%
NYT Connections (extended)52.5%12.9%
LMArena Hard Prompts14761436
Epoch Capabilities Index150.1141.42
ARC-AGI-237.6%—
SimpleBench62%—
ARC-AGI-180%—
Chess Puzzles12%—
EnigmaEval11.9%—
EBR-Bench14.3%—
Mystery Game Puzzles22%—
DTBench89.9%—
LMCA44.5%—
ForecastBench60.7—

Math Claude Opus 4.5 leads

Claude Opus 4.5: 38.5 (#85), Mistral Medium 3.5: 36.4 (#113)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena Math14631432
FrontierMath (Tiers 1-3)34.4%—
FrontierMath Tier 44.9%—
OTIS Mock AIME 2024-202586.1%—
ProofBench36%—
FrontierMath (Feb 2025 set)20.7%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.5 leads

Claude Opus 4.5: 56.4 (#38), Mistral Medium 3.5: 39.3 (#123)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena Expert14881431
GPQA Diamond86%—
Humanity's Last Exam25.2%—
SimpleQA Verified45.7%—
Vectara Hallucination Rate10.9%—

Multimodal Mistral Medium 3.5 leads

Claude Opus 4.5: 31.1 (#99), Mistral Medium 3.5: 37.6 (#64)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena Vision—1222
GeoBench75%—
VPCT40%—
Furniture Assembly28.3%—
LMArena Document1462—

Multilingual Claude Opus 4.5 leads

Claude Opus 4.5: 54.5 (#45), Mistral Medium 3.5: 52.1 (#93)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena Non-English14381405
LMArena Chinese14701443
LMArena French14711448
LMArena German14491453
LMArena Korean14241387
LMArena Russian14481396
LMArena Spanish14551406
LMArena Japanese1415—

Instruction Following Claude Opus 4.5 leads

Claude Opus 4.5: 77.7 (#20), Mistral Medium 3.5: 74.7 (#87)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena Instruction Following14781414

Long Context Claude Opus 4.5 leads

Claude Opus 4.5: 46.4 (#21), Mistral Medium 3.5: 43.2 (#101)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena Longer Query14801414
CL-bench21.1%—

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.2 (#28), Mistral Medium 3.5: 58.6 (#113)

BenchmarkClaude Opus 4.5Mistral Medium 3.5
LMArena Text14511421
LMArena Creative Writing14451372
LMArena Multi-Turn14661423
EQ-Bench Creative Writing1687—
EQ-Bench 4—993

Frequently asked questions

Is Claude Opus 4.5 better than Mistral Medium 3.5?

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 39.6 on the Noometry Index. Mistral Medium 3.5 costs 3.3× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 4.5 or Mistral Medium 3.5?

Mistral Medium 3.5 is cheaper. It lists at $1.50 per million input tokens and $7.50 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or Mistral Medium 3.5 better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 35.7 in the Noometry coding category.

Which has the bigger context window?

Mistral Medium 3.5 does, with 262K tokens against 200K.

How many benchmarks do Claude Opus 4.5 and Mistral Medium 3.5 share?

20 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Mistral Medium 3.5 has 22.

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