Noometry

Model comparison

Granite 3.1 8b Instruct vs Grok 4.5

Grok 4.5 is the stronger model overall, scoring 55.0 to 31.8 on the Noometry Index.

Last verified . 12 shared benchmarks.

Granite 3.1 8b Instruct IBM

31.8

Rank #256 Confirmed

Grok 4.5 xAI

55.0

Rank #22 Confirmed

Summary

  • They share 12 benchmarks with published results for both. Granite 3.1 8b Instruct scores higher in 0 categories and Grok 4.5 in 9 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.5 leads 56.0 to 21.2.
  • Granite 3.1 8b Instruct has downloadable open weights; the other is API-only.

Side by side

Granite 3.1 8b InstructGrok 4.5
ProviderIBMxAI
Noometry Index31.855.0
Released—2026-07-08
WeightsOpenProprietary
Context window—500K
Max output—500K
Input $ / M tokens—$2
Output $ / M tokens—$6
Results tracked1352

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Category by category

Coding Grok 4.5 leads

Granite 3.1 8b Instruct: 33.9 (#232), Grok 4.5: 51.7 (#34)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Coding11861473
DeepSWE—53.8%
FrontierCode—42.4%
LMArena WebDev—1552
SciCode—54.1%
WeirdML—46.4%
ALE-Bench—1,309

Agentic & Tool Use Grok 4.5 leads

Granite 3.1 8b Instruct: 23.9 (#113), Grok 4.5: 44.4 (#15)

BenchmarkGranite 3.1 8b InstructGrok 4.5
APEX-Agents—56.2%
Berkeley Function Calling Leaderboard27.1%—
τ²-bench Banking—47.9%
PostTrainBench—23.4%
GBAEval—65.4%
GDP.pdf—14%
LMArena Search—1213
Vending-Bench 2—3,887

Reasoning Grok 4.5 leads

Granite 3.1 8b Instruct: 21.2 (#204), Grok 4.5: 56.0 (#23)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Hard Prompts11461462
ARC-AGI-2—52.6%
SimpleBench—70%
Kagi LLM Benchmark—83.5%
NYT Connections (extended)—79.9%
ARC-AGI-1—87.2%
CritPt—15.4%
Chess Puzzles—36%
DTBench—96.5%
LMCA—45.2%
Surface Evolver Bench—74.4%
Epoch Capabilities Index—154.02

Math Grok 4.5 leads

Granite 3.1 8b Instruct: 30.4 (#210), Grok 4.5: 60.7 (#29)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Math11521457
FrontierMath (Tiers 1-3)—57.2%
FrontierMath Tier 4—24.4%
OTIS Mock AIME 2024-2025—97.8%
ProofBench—31%

Knowledge Grok 4.5 leads

Granite 3.1 8b Instruct: 30.6 (#218), Grok 4.5: 62.3 (#21)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Expert11421466
GPQA Diamond—93.4%
SimpleQA Verified—48.3%

Multimodal Not comparable

Granite 3.1 8b Instruct: —, Grok 4.5: 37.8 (#63)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Vision—1287
Blueprint-Bench 2—27.3%
Furniture Assembly—22.5%
LMArena Document—1452

Multilingual Grok 4.5 leads

Granite 3.1 8b Instruct: 31.1 (#255), Grok 4.5: 54.5 (#43)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Non-English10991439
LMArena Chinese11451497
LMArena Russian10921447
LMArena French—1458
LMArena German—1448
LMArena Japanese—1425
LMArena Korean—1402
LMArena Spanish—1452

Instruction Following Grok 4.5 leads

Granite 3.1 8b Instruct: 58.9 (#254), Grok 4.5: 76.3 (#45)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Instruction Following11311446

Long Context Grok 4.5 leads

Granite 3.1 8b Instruct: 35.2 (#236), Grok 4.5: 44.8 (#54)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Longer Query11621463

Writing & Preference Grok 4.5 leads

Granite 3.1 8b Instruct: 35.7 (#261), Grok 4.5: 65.9 (#40)

BenchmarkGranite 3.1 8b InstructGrok 4.5
LMArena Text11501448
LMArena Creative Writing11291442
LMArena Multi-Turn11081457
EQ-Bench Creative Writing—1579

Frequently asked questions

Is Granite 3.1 8b Instruct better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 31.8 on the Noometry Index.

Is Granite 3.1 8b Instruct or Grok 4.5 better for coding?

Grok 4.5 scores higher on coding benchmarks: 51.7 versus 33.9 in the Noometry coding category.

How many benchmarks do Granite 3.1 8b Instruct and Grok 4.5 share?

12 benchmarks have published results for both models. Granite 3.1 8b Instruct has 13 scored results on Noometry and Grok 4.5 has 52.

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