Noometry

Model comparison

Claude Sonnet 5.5 vs Mistral Medium 3

Claude Sonnet 5.5 has enough public results to be ranked (#10); Mistral Medium 3 does not yet, so treat this comparison as directional.

Last verified . 1 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Mistral Medium 3 Mistral AI

37.0

Unranked Sparse

Summary

  • They share 1 benchmark with published results for both. Claude Sonnet 5.5 scores higher in 1 category and Mistral Medium 3 in 0 categories; one gap is clear of the uncertainty.
  • The widest gap is in knowledge, where Claude Sonnet 5.5 leads 66.0 to 34.6.
  • Mistral Medium 3 is cheaper at $0.40 / $2 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • Claude Sonnet 5.5 accepts more context: 1M tokens versus 131K.

Side by side

Claude Sonnet 5.5Mistral Medium 3
ProviderAnthropicMistral AI
Noometry Index61.937.0
Released2026-09-282025-05-07
WeightsProprietaryProprietary
Context window1M131K
Max output128K131K
Input $ / M tokens$2$0.40
Output $ / M tokens$10$2
Results tracked322

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Category by category

Coding Not comparable

Claude Sonnet 5.5: 67.3 (#6), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
FrontierCode52.1%—
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
SciCode61%—
LMArena Coding1513—
ALE-Bench1,819—

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
APEX-Agents75.5%—

Reasoning Not comparable

Claude Sonnet 5.5: 54.0 (#28), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
Epoch Capabilities Index165.03134.07
NYT Connections (extended)80.5%—
CritPt31.4%—
LMArena Hard Prompts1495—
Mystery Game Puzzles65%—

Math Not comparable

Claude Sonnet 5.5: 87.9 (#6), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1510—
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Mistral Medium 3: 34.6

BenchmarkClaude Sonnet 5.5Mistral Medium 3
GPQA Diamond95.6%—
SimpleQA Verified46.5%—
Confabulations—21.9%
LMArena Expert1540—

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Not comparable

Claude Sonnet 5.5: 55.3 (#30), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
LMArena Non-English1452—
LMArena Chinese1522—
LMArena Russian1451—

Instruction Following Not comparable

Claude Sonnet 5.5: 78.3 (#11), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
LMArena Instruction Following1495—

Long Context Not comparable

Claude Sonnet 5.5: 45.9 (#28), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
LMArena Longer Query1498—

Writing & Preference Not comparable

Claude Sonnet 5.5: 66.0 (#40), Mistral Medium 3: —

BenchmarkClaude Sonnet 5.5Mistral Medium 3
LMArena Text1471—
LMArena Creative Writing1465—
LMArena Multi-Turn1474—

Frequently asked questions

Is Claude Sonnet 5.5 better than Mistral Medium 3?

Claude Sonnet 5.5 has enough public results to be ranked (#10); Mistral Medium 3 does not yet, so treat this comparison as directional.

Which is cheaper, Claude Sonnet 5.5 or Mistral Medium 3?

Mistral Medium 3 is cheaper. It lists at $0.40 per million input tokens and $2 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 131K.

How many benchmarks do Claude Sonnet 5.5 and Mistral Medium 3 share?

1 benchmark has published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Mistral Medium 3 has 2.

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