Noometry

Model comparison

DeepSeek-V3.1-Terminus vs Grok 4 Fast

DeepSeek-V3.1-Terminus is the stronger model overall, scoring 42.6 to 39.0 on the Noometry Index.

Last verified . 12 shared benchmarks.

DeepSeek-V3.1-Terminus DeepSeek

42.6

Rank #96 Confirmed

Grok 4 Fast xAI

39.0

Rank #164 Confirmed

Summary

  • They share 12 benchmarks with published results for both. DeepSeek-V3.1-Terminus scores higher in 5 categories and Grok 4 Fast in 2 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 43.5.
  • The biggest single-benchmark swing is Kagi LLM Benchmark: 57.4% for DeepSeek-V3.1-Terminus and 66.1% for Grok 4 Fast.
  • DeepSeek-V3.1-Terminus has downloadable open weights; the other is API-only.

Side by side

DeepSeek-V3.1-TerminusGrok 4 Fast
ProviderDeepSeekxAI
Noometry Index42.639.0
Released2025-09-222025-09-19
WeightsOpenProprietary
Context window164K—
Max output66K—
Input $ / M tokens$0.30—
Output $ / M tokens$1—
Results tracked1630

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Category by category

Coding DeepSeek-V3.1-Terminus leads

DeepSeek-V3.1-Terminus: 41.5 (#114), Grok 4 Fast: 32.3 (#264)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
LMArena Coding14261429
LMArena WebDev—1160
SciCode40.6%—
WeirdML—42.9%
ALE-Bench745.17—

Agentic & Tool Use Not comparable

DeepSeek-V3.1-Terminus: —, Grok 4 Fast: 29.3 (#80)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
τ²-bench Banking—15.7%
Cybench—30%
LMArena Search—1171

Reasoning DeepSeek-V3.1-Terminus leads

DeepSeek-V3.1-Terminus: 25.7 (#126), Grok 4 Fast: 22.5 (#179)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
Kagi LLM Benchmark57.4%66.1%
LMArena Hard Prompts14271413
DTBench81.3%82.7%
ARC-AGI-2—5.3%
ARC-AGI-1—48.5%
CritPt1.7%—
LMCA28.6%—
Epoch Capabilities Index—144.21
ForecastBench—60.5

Math Too close to call

DeepSeek-V3.1-Terminus: 35.7 (#138), Grok 4 Fast: 36.1 (#126)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
LMArena Math14021419

Knowledge Not comparable

DeepSeek-V3.1-Terminus: —, Grok 4 Fast: 31.5 (#211)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
Vectara Hallucination Rate—19.7%
LMArena Expert—1411

Multilingual Too close to call

DeepSeek-V3.1-Terminus: 52.3 (#87), Grok 4 Fast: 51.5 (#106)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
LMArena Non-English14071397
LMArena Russian14341387
LMArena Chinese—1458
LMArena French—1433
LMArena German—1383
LMArena Japanese—1358
LMArena Korean—1359
LMArena Spanish—1414

Instruction Following Too close to call

DeepSeek-V3.1-Terminus: 74.4 (#96), Grok 4 Fast: 73.4 (#116)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
LMArena Instruction Following14061388

Long Context Grok 4 Fast leads

DeepSeek-V3.1-Terminus: 43.5 (#88), Grok 4 Fast: 63.2 (#3)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
LMArena Longer Query14261415
Fiction.LiveBench—94.4%

Writing & Preference DeepSeek-V3.1-Terminus leads

DeepSeek-V3.1-Terminus: 61.3 (#87), Grok 4 Fast: 60.2 (#96)

BenchmarkDeepSeek-V3.1-TerminusGrok 4 Fast
LMArena Text14201407
LMArena Creative Writing14041388
LMArena Multi-Turn14111414

Frequently asked questions

Is DeepSeek-V3.1-Terminus better than Grok 4 Fast?

DeepSeek-V3.1-Terminus is the stronger model overall, scoring 42.6 to 39.0 on the Noometry Index.

Is DeepSeek-V3.1-Terminus or Grok 4 Fast better for coding?

DeepSeek-V3.1-Terminus scores higher on coding benchmarks: 41.5 versus 32.3 in the Noometry coding category.

How many benchmarks do DeepSeek-V3.1-Terminus and Grok 4 Fast share?

12 benchmarks have published results for both models. DeepSeek-V3.1-Terminus has 16 scored results on Noometry and Grok 4 Fast has 30.

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