Noometry

Model comparison

Claude Opus 5.5 vs Mixtral 8x22B

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 26.7 on the Noometry Index. Mixtral 8x22B costs 2.7× 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 8x22B Mistral AI

26.7

Rank #330 Confirmed

Summary

  • They share 13 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and Mixtral 8x22B in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 21.2.
  • The biggest single-benchmark swing is GPQA Diamond: 90.6% for Claude Opus 5.5 and 34.1% for Mixtral 8x22B.
  • Mixtral 8x22B is cheaper at $2 / $6 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 64K.
  • Mixtral 8x22B has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Mixtral 8x22B
ProviderAnthropicMistral AI
Noometry Index68.526.7
Released2026-09-222024-04-17
WeightsProprietaryOpen
Context window1M64K
Max output128K64K
Input $ / M tokens$4$2
Output $ / M tokens$20$6
Results tracked3534

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), Mixtral 8x22B: 23.8 (#324)

BenchmarkClaude Opus 5.5Mixtral 8x22B
LMArena Coding15451166
FrontierCode54.4%—
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
SciCode66.9%—
WeirdML—3.2%
BigCodeBench Instruct—40.6%
MirrorCode77.4%—
BigCodeBench Complete—50.2%
HumanEval+—72%
MBPP+—64.3%

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#13), Mixtral 8x22B: 22.8 (#119)

BenchmarkClaude Opus 5.5Mixtral 8x22B
APEX-Agents73.5%—
Cybench—7.5%
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), Mixtral 8x22B: 19.1 (#246)

BenchmarkClaude Opus 5.5Mixtral 8x22B
LMArena Hard Prompts15451150
DTBench98.9%55.1%
ARC-AGI-292.5%—
NYT Connections (extended)88.5%—
ARC-AGI-197.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
LMCA68.2%—
Epoch Capabilities Index—122
ForecastBench—56.3

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), Mixtral 8x22B: 21.2 (#271)

BenchmarkClaude Opus 5.5Mixtral 8x22B
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
Omni-MATH—16.3%
LMArena Math—1184
MATH Level 5—24.2%

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.6 (#9), Mixtral 8x22B: 15.1 (#288)

BenchmarkClaude Opus 5.5Mixtral 8x22B
GPQA Diamond90.6%34.1%
LMArena Expert15641113
SimpleQA Verified72.2%—
MMLU-Pro—46%
GPQA (HELM)—33.4%
MMLU—77.8%

Multimodal Not comparable

Claude Opus 5.5: 56.5 (#2), Mixtral 8x22B: —

BenchmarkClaude Opus 5.5Mixtral 8x22B
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), Mixtral 8x22B: 32.9 (#250)

BenchmarkClaude Opus 5.5Mixtral 8x22B
LMArena Non-English15131128
LMArena Chinese15721116
LMArena Russian15321158
LMArena French—1165
LMArena German—1141
LMArena Japanese—1037
LMArena Korean—1056
LMArena Spanish—1150

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), Mixtral 8x22B: 57.9 (#261)

BenchmarkClaude Opus 5.5Mixtral 8x22B
LMArena Instruction Following15351147
IFEval—72.4%

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), Mixtral 8x22B: 34.6 (#242)

BenchmarkClaude Opus 5.5Mixtral 8x22B
LMArena Longer Query15401144

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), Mixtral 8x22B: 37.1 (#257)

BenchmarkClaude Opus 5.5Mixtral 8x22B
LMArena Text15181162
LMArena Creative Writing15381141
LMArena Multi-Turn15201130
EQ-Bench Creative Writing2050—
WildBench—71.1%

Frequently asked questions

Is Claude Opus 5.5 better than Mixtral 8x22B?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 26.7 on the Noometry Index. Mixtral 8x22B costs 2.7× 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 8x22B?

Mixtral 8x22B is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Mixtral 8x22B better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 23.8 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 64K.

How many benchmarks do Claude Opus 5.5 and Mixtral 8x22B share?

13 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Mixtral 8x22B has 34.

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