Noometry

Model comparison

Claude Opus 5.5 vs Mixtral 8x7B

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 26.8 on the Noometry Index. Mixtral 8x7B costs 11× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 13 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

Mixtral 8x7B Mistral AI

26.8

Rank #328 Confirmed

Summary

  • They share 13 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Mixtral 8x7B in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 17.2.
  • The biggest single-benchmark swing is GPQA Diamond: 90.6% for Claude Opus 5.5 and 30.6% for Mixtral 8x7B.
  • Mixtral 8x7B is cheaper at $0.70 / $0.70 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 32K.
  • Mixtral 8x7B has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Mixtral 8x7B
ProviderAnthropicMistral AI
Noometry Index68.526.8
Released2026-09-222023-12-11
WeightsProprietaryOpen
Context window1M32K
Max output128K32K
Input $ / M tokens$4$0.70
Output $ / M tokens$20$0.70
Results tracked3538

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), Mixtral 8x7B: 32.2 (#265)

BenchmarkClaude Opus 5.5Mixtral 8x7B
LMArena Coding15451127
FrontierCode54.4%—
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
HumanEval+—39.6%
MBPP+—49.7%

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#13), Mixtral 8x7B: —

BenchmarkClaude Opus 5.5Mixtral 8x7B
APEX-Agents73.5%—
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), Mixtral 8x7B: 17.4 (#283)

BenchmarkClaude Opus 5.5Mixtral 8x7B
LMArena Hard Prompts15451115
DTBench98.9%49.6%
ARC-AGI-292.5%—
NYT Connections (extended)88.5%—
ARC-AGI-197.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
LMCA68.2%—
Adversarial NLI—55.2%
Epoch Capabilities Index—118.38
ForecastBench—56.3
HellaSwag—86.7%
PIQA—83.6%
WinoGrande—77.2%

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), Mixtral 8x7B: 17.2 (#284)

BenchmarkClaude Opus 5.5Mixtral 8x7B
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
Omni-MATH—10.5%
LMArena Math—1147
MATH Level 5—10%
GSM8K—74.4%

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.6 (#9), Mixtral 8x7B: 11.0 (#296)

BenchmarkClaude Opus 5.5Mixtral 8x7B
GPQA Diamond90.6%30.6%
LMArena Expert15641088
SimpleQA Verified72.2%—
MMLU-Pro—33.5%
GPQA (HELM)—29.6%
ARC (AI2) Challenge—87.3%
MMLU—70.6%
OpenBookQA—85.8%
TriviaQA—82.2%

Multimodal Not comparable

Claude Opus 5.5: 56.5 (#2), Mixtral 8x7B: —

BenchmarkClaude Opus 5.5Mixtral 8x7B
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), Mixtral 8x7B: 29.8 (#261)

BenchmarkClaude Opus 5.5Mixtral 8x7B
LMArena Non-English15131077
LMArena Chinese15721055
LMArena Russian15321090
LMArena French—1165
LMArena German—1114
LMArena Japanese—931
LMArena Korean—968
LMArena Spanish—1110

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), Mixtral 8x7B: 51.2 (#292)

BenchmarkClaude Opus 5.5Mixtral 8x7B
LMArena Instruction Following15351110
IFEval—57.5%

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), Mixtral 8x7B: 33.4 (#255)

BenchmarkClaude Opus 5.5Mixtral 8x7B
LMArena Longer Query15401103

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), Mixtral 8x7B: 34.4 (#265)

BenchmarkClaude Opus 5.5Mixtral 8x7B
LMArena Text15181132
LMArena Creative Writing15381109
LMArena Multi-Turn15201115
EQ-Bench Creative Writing2050—
WildBench—67.3%

Frequently asked questions

Is Claude Opus 5.5 better than Mixtral 8x7B?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 26.8 on the Noometry Index. Mixtral 8x7B costs 11× 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 Mixtral 8x7B?

Mixtral 8x7B is cheaper. It lists at $0.70 per million input tokens and $0.70 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Mixtral 8x7B better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 32.2 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 32K.

How many benchmarks do Claude Opus 5.5 and Mixtral 8x7B share?

13 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Mixtral 8x7B has 38.

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