Noometry

Model comparison

Claude Opus 5.5 vs Mistral 7B

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 23.0 on the Noometry Index. Mistral 7B costs 32× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 18 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Mistral 7B Mistral AI

23.0

Rank #351 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Mistral 7B in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 8.1.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Opus 5.5 and 0.3% for Mistral 7B.
  • Mistral 7B is cheaper at $0.25 / $0.25 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 8K.
  • Mistral 7B has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Mistral 7B
ProviderAnthropicMistral AI
Noometry Index68.623.0
Released2026-09-222023-09-27
WeightsProprietaryOpen
Context window1M8K
Max output128K8K
Input $ / M tokens$4$0.25
Output $ / M tokens$20$0.25
Results tracked4437

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Mistral 7B: 26.4 (#326)

BenchmarkClaude Opus 5.5Mistral 7B
LMArena Coding15471082
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
BigCodeBench Instruct—19.5%
MirrorCode77.4%—
BigCodeBench Complete—27.3%
ALE-Bench2,147—
HumanEval+—36%
MBPP+—42.1%

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Mistral 7B: —

BenchmarkClaude Opus 5.5Mistral 7B
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Mistral 7B: 13.1 (#336)

BenchmarkClaude Opus 5.5Mistral 7B
LMArena Hard Prompts15351067
DTBench98.9%42.5%
Epoch Capabilities Index167.33112.21
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
Chess Puzzles—0%
EBR-Bench71.4%—
Mystery Game Puzzles71%—
LMCA68.2%—
Adversarial NLI—47.1%
BIG-Bench Hard—56.1%
HellaSwag—81%
PIQA—83%
WinoGrande—75.3%

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Mistral 7B: 8.1 (#325)

BenchmarkClaude Opus 5.5Mistral 7B
OTIS Mock AIME 2024-2025100%0.3%
LMArena Math15061085
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
ProofBench100%—
MATH Level 5—3.7%
FrontierMath Erdős2.9%—
GSM8K—54.4%

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Mistral 7B: 7.4 (#311)

BenchmarkClaude Opus 5.5Mistral 7B
GPQA Diamond90.6%15.2%
LMArena Expert15471036
SimpleQA Verified72.2%—
ARC (AI2) Challenge—78.6%
BoolQ—87.4%
MMLU—62.5%
OpenBookQA—79.8%
TriviaQA—75.2%

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Mistral 7B: —

BenchmarkClaude Opus 5.5Mistral 7B
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Mistral 7B: 25.8 (#283)

BenchmarkClaude Opus 5.5Mistral 7B
LMArena Non-English15071012
LMArena Chinese15881009
LMArena French15141037
LMArena Russian15201018
LMArena Spanish15071026
LMArena German—987
LMArena Japanese—878

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Mistral 7B: 54.2 (#280)

BenchmarkClaude Opus 5.5Mistral 7B
LMArena Instruction Following15371060

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Mistral 7B: 32.2 (#271)

BenchmarkClaude Opus 5.5Mistral 7B
LMArena Longer Query15321060

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Mistral 7B: 30.7 (#286)

BenchmarkClaude Opus 5.5Mistral 7B
LMArena Text15151090
LMArena Creative Writing15331068
LMArena Multi-Turn14991062
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Mistral 7B?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 23.0 on the Noometry Index. Mistral 7B costs 32× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Mistral 7B?

Mistral 7B is cheaper. It lists at $0.25 per million input tokens and $0.25 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Mistral 7B better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 26.4 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 8K.

How many benchmarks do Claude Opus 5.5 and Mistral 7B share?

18 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Mistral 7B has 37.

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