Noometry

Model comparison

Claude Sonnet 4.5 vs Magistral Small

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 29.9 on the Noometry Index. Magistral Small costs 8.0× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

Last verified . 10 shared benchmarks.

Claude Sonnet 4.5 Anthropic

44.0

Rank #76 Confirmed

Magistral Small Mistral AI

29.9

Rank #289 Confirmed

Summary

  • They share 10 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 4 categories and Magistral Small in 0 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Sonnet 4.5 leads 26.9 to 6.9.
  • The biggest single-benchmark swing is ARC-AGI-1: 63.7% for Claude Sonnet 4.5 and 5% for Magistral Small.
  • Magistral Small is cheaper at $0.50 / $1.50 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
  • Claude Sonnet 4.5 accepts more context: 1M tokens versus 128K.
  • Magistral Small has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 4.5Magistral Small
ProviderAnthropicMistral AI
Noometry Index44.029.9
Released2025-09-292025-06-10
WeightsProprietaryOpen
Context window1M128K
Max output64K40K
Input $ / M tokens$3$0.50
Output $ / M tokens$15$1.50
Results tracked7310

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Category by category

Coding Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 47.8 (#54), Magistral Small: 37.8 (#172)

BenchmarkClaude Sonnet 4.5Magistral Small
SciCode44.7%35.2%
SWE-bench Verified71.3%—
SWE-bench Verified (bash only)71.4%—
LMArena WebDev1393—
SWE-bench Multilingual67%—
GSO14.7%—
WeirdML47.7%—
LMArena Coding1489—
ALE-Bench796.15—
AlgoTune1.52—

Agentic & Tool Use Not comparable

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

BenchmarkClaude Sonnet 4.5Magistral Small
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), Magistral Small: 6.9 (#345)

BenchmarkClaude Sonnet 4.5Magistral Small
ARC-AGI-213.6%0%
Kagi LLM Benchmark57.9%6.3%
ARC-AGI-163.7%5%
CritPt1.1%0.3%
Chess Puzzles12%3%
DTBench83.2%61.3%
Epoch Capabilities Index146.84133.19
SimpleBench54.3%—
NYT Connections (extended)37.3%—
EnigmaEval6%—
EBR-Bench2.4%—
LMArena Hard Prompts1462—
Mystery Game Puzzles17%—
LMCA38.8%—
ForecastBench61.9—

Math Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 31.9 (#190), Magistral Small: 24.9 (#253)

BenchmarkClaude Sonnet 4.5Magistral Small
OTIS Mock AIME 2024-202577.8%30%
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), Magistral Small: 30.9 (#215)

BenchmarkClaude Sonnet 4.5Magistral Small
GPQA Diamond82.3%56.1%
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), Magistral Small: —

BenchmarkClaude Sonnet 4.5Magistral Small
VPCT39.8%—
LMArena Document1450—

Multilingual Not comparable

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

BenchmarkClaude Sonnet 4.5Magistral Small
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), Magistral Small: —

BenchmarkClaude Sonnet 4.5Magistral Small
IFEval85%—
LMArena Instruction Following1459—

Long Context Not comparable

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

BenchmarkClaude Sonnet 4.5Magistral Small
LMArena Longer Query1476—

Writing & Preference Not comparable

Claude Sonnet 4.5: 66.7 (#33), Magistral Small: —

BenchmarkClaude Sonnet 4.5Magistral Small
LMArena Text1439—
LMArena Creative Writing1442—
EQ-Bench Creative Writing1678—
WildBench85.4%—
LMArena Multi-Turn1465—

Frequently asked questions

Is Claude Sonnet 4.5 better than Magistral Small?

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 29.9 on the Noometry Index. Magistral Small costs 8.0× 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 Magistral Small?

Magistral Small is cheaper. It lists at $0.50 per million input tokens and $1.50 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.

Is Claude Sonnet 4.5 or Magistral Small better for coding?

Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 37.8 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 4.5 does, with 1M tokens against 128K.

How many benchmarks do Claude Sonnet 4.5 and Magistral Small share?

10 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Magistral Small has 10.

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