Noometry

Model comparison

Claude Sonnet 5.5 vs Mistral Medium

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 36.3 on the Noometry Index.

Last verified . 20 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Mistral Medium Mistral AI

36.3

Rank #218 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 10 categories and Mistral Medium in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 28.1.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Sonnet 5.5 and 9% for Mistral Medium.
  • Mistral Medium is cheaper at $1.50 / $7.50 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • Claude Sonnet 5.5 accepts more context: 1M tokens versus 262K.
  • Mistral Medium has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5.5Mistral Medium
ProviderAnthropicMistral AI
Noometry Index61.936.3
Released2026-09-282023-12-11
WeightsProprietaryOpen
Context window1M262K
Max output128K262K
Input $ / M tokens$2$1.50
Output $ / M tokens$10$7.50
Results tracked3236

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Mistral Medium: 34.2 (#243)

BenchmarkClaude Sonnet 5.5Mistral Medium
FrontierCode52.1%8%
SciCode61%40.2%
LMArena Coding15131434
ALE-Bench1,819763.98
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
WeirdML—43.7%

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), Mistral Medium: 28.3 (#90)

BenchmarkClaude Sonnet 5.5Mistral Medium
APEX-Agents75.5%—
Berkeley Function Calling Leaderboard—37.7%

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Mistral Medium: 24.0 (#167)

BenchmarkClaude Sonnet 5.5Mistral Medium
CritPt31.4%0%
LMArena Hard Prompts14951426
Kagi LLM Benchmark—50%
NYT Connections (extended)80.5%—
Mystery Game Puzzles65%—
DTBench—75.5%
LMCA—26.1%
Surface Evolver Bench—26.9%
Epoch Capabilities Index165.03—

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Mistral Medium: 28.1 (#245)

BenchmarkClaude Sonnet 5.5Mistral Medium
OTIS Mock AIME 2024-2025100%32.2%
ProofBench100%9%
LMArena Math15101408
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
MATH Level 5—81.6%
FrontierMath (Feb 2025 set)—0.3%
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Mistral Medium: 25.0 (#265)

BenchmarkClaude Sonnet 5.5Mistral Medium
GPQA Diamond95.6%59.5%
LMArena Expert15401408
Humanity's Last Exam—4.5%
SimpleQA Verified46.5%—
Vectara Hallucination Rate—22.7%

Multimodal Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 51.5 (#6), Mistral Medium: 35.3 (#88)

BenchmarkClaude Sonnet 5.5Mistral Medium
LMArena Vision12891172
Furniture Assembly75%—

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), Mistral Medium: 52.1 (#91)

BenchmarkClaude Sonnet 5.5Mistral Medium
LMArena Non-English14521408
LMArena Chinese15221447
LMArena Russian14511411
LMArena French—1459
LMArena German—1432
LMArena Japanese—1378
LMArena Korean—1380
LMArena Spanish—1433

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), Mistral Medium: 73.7 (#116)

BenchmarkClaude Sonnet 5.5Mistral Medium
LMArena Instruction Following14951398

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), Mistral Medium: 42.9 (#114)

BenchmarkClaude Sonnet 5.5Mistral Medium
LMArena Longer Query14981406

Writing & Preference Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#40), Mistral Medium: 60.0 (#103)

BenchmarkClaude Sonnet 5.5Mistral Medium
LMArena Text14711424
LMArena Creative Writing14651391
LMArena Multi-Turn14741418
Short-Story Creative Writing—77.3%

Frequently asked questions

Is Claude Sonnet 5.5 better than Mistral Medium?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 36.3 on the Noometry Index.

Which is cheaper, Claude Sonnet 5.5 or Mistral Medium?

Mistral Medium is cheaper. It lists at $1.50 per million input tokens and $7.50 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Is Claude Sonnet 5.5 or Mistral Medium better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 34.2 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 262K.

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

20 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Mistral Medium has 36.

Related comparisons

Go deeper