Noometry

Model comparison

Claude Sonnet 4.5 vs Mistral Small 3.2

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 30.8 on the Noometry Index. Mistral Small 3.2 costs 45× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

Last verified . 6 shared benchmarks.

Claude Sonnet 4.5 Anthropic

44.0

Rank #76 Confirmed

Mistral Small 3.2 Mistral AI

30.8

Rank #271 Confirmed

Summary

  • They share 6 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 4 categories and Mistral Small 3.2 in 0 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where Claude Sonnet 4.5 leads 66.7 to 45.1.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 77.8% for Claude Sonnet 4.5 and 30.3% for Mistral Small 3.2.
  • Mistral Small 3.2 is cheaper at $0.0938 / $0.25 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
  • Claude Sonnet 4.5 accepts more context: 1M tokens versus 256K.
  • Mistral Small 3.2 has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 4.5Mistral Small 3.2
ProviderAnthropicMistral AI
Noometry Index44.030.8
Released2025-09-292025-06-20
WeightsProprietaryOpen
Context window1M256K
Max output64K16K
Input $ / M tokens$3$0.0938
Output $ / M tokens$15$0.25
Results tracked736

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Category by category

Coding Not comparable

Claude Sonnet 4.5: 47.8 (#54), Mistral Small 3.2: —

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
SWE-bench Verified71.3%—
SWE-bench Verified (bash only)71.4%—
LMArena WebDev1393—
SWE-bench Multilingual67%—
SciCode44.7%—
GSO14.7%—
WeirdML47.7%—
LMArena Coding1489—
ALE-Bench796.15—
AlgoTune1.52—

Agentic & Tool Use Not comparable

Claude Sonnet 4.5: 38.1 (#30), Mistral Small 3.2: —

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
Terminal-Bench46.5%—
Berkeley Function Calling Leaderboard73.2%—
GDPval42.5%—
Remote Labor Index2.1%—
τ²-bench Airline72%—
τ²-bench Banking25.3%—
τ²-bench Retail72.4%—
τ²-bench Telecom84.9%—
Cybench60%—
DeepResearch Bench52.6%—
OSWorld62.9%—
LMArena Search1159—
METR Time Horizons67.4%—
Vending-Bench 23,839—

Reasoning Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 26.9 (#113), Mistral Small 3.2: 17.5 (#282)

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
Kagi LLM Benchmark57.9%40.4%
Chess Puzzles12%1%
Epoch Capabilities Index146.84131.73
ARC-AGI-213.6%—
SimpleBench54.3%—
NYT Connections (extended)37.3%—
ARC-AGI-163.7%—
CritPt1.1%—
EnigmaEval6%—
EBR-Bench2.4%—
LMArena Hard Prompts1462—
Mystery Game Puzzles17%—
DTBench83.2%—
LMCA38.8%—
ForecastBench61.9—

Math Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 31.9 (#190), Mistral Small 3.2: 24.9 (#251)

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
OTIS Mock AIME 2024-202577.8%30.3%
FrontierMath (Tiers 1-3)23.9%—
FrontierMath Tier 42.4%—
ProofBench19%—
Omni-MATH55.3%—
LMArena Math1448—
MATH Level 597.7%—
FrontierMath (Feb 2025 set)15.2%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 48.4 (#70), Mistral Small 3.2: 26.8 (#249)

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
GPQA Diamond82.3%49.1%
Humanity's Last Exam13.7%—
SimpleQA Verified30.7%—
MMLU-Pro86.9%—
Vectara Hallucination Rate12%—
GPQA (HELM)68.6%—
LMArena Expert1483—

Multimodal Not comparable

Claude Sonnet 4.5: 34.1 (#84), Mistral Small 3.2: —

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
VPCT39.8%—
LMArena Document1450—

Multilingual Not comparable

Claude Sonnet 4.5: 53.6 (#65), Mistral Small 3.2: —

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
LMArena Non-English1425—
LMArena Chinese1459—
LMArena French1459—
LMArena German1427—
LMArena Japanese1390—
LMArena Korean1403—
LMArena Russian1436—
LMArena Spanish1457—

Instruction Following Not comparable

Claude Sonnet 4.5: 75.2 (#74), Mistral Small 3.2: —

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
IFEval85%—
LMArena Instruction Following1459—

Long Context Not comparable

Claude Sonnet 4.5: 45.2 (#45), Mistral Small 3.2: —

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
LMArena Longer Query1476—

Writing & Preference Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 66.7 (#33), Mistral Small 3.2: 45.1 (#219)

BenchmarkClaude Sonnet 4.5Mistral Small 3.2
EQ-Bench Creative Writing16781255
LMArena Text1439—
LMArena Creative Writing1442—
WildBench85.4%—
LMArena Multi-Turn1465—

Frequently asked questions

Is Claude Sonnet 4.5 better than Mistral Small 3.2?

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 30.8 on the Noometry Index. Mistral Small 3.2 costs 45× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 4.5 or Mistral Small 3.2?

Mistral Small 3.2 is cheaper. It lists at $0.0938 per million input tokens and $0.25 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.

Which has the bigger context window?

Claude Sonnet 4.5 does, with 1M tokens against 256K.

How many benchmarks do Claude Sonnet 4.5 and Mistral Small 3.2 share?

6 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Mistral Small 3.2 has 6.

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