Noometry

Model comparison

C4ai Aya Expanse 8b vs GPT-6 Astra

GPT-6 Astra is the stronger model overall, scoring 70.8 to 34.9 on the Noometry Index.

Last verified . 15 shared benchmarks.

C4ai Aya Expanse 8b Cohere

34.9

Rank #229 Confirmed

GPT-6 Astra OpenAI

70.8

Rank #1 Confirmed

Summary

  • They share 15 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 0 categories and GPT-6 Astra in 8 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 22.4.
  • C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.

Side by side

C4ai Aya Expanse 8bGPT-6 Astra
ProviderCohereOpenAI
Noometry Index34.970.8
Released—2026-09-03
WeightsOpenProprietary
Context window—1.05M
Max output—128K
Input $ / M tokens—$10
Output $ / M tokens—$50
Results tracked1556

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Category by category

Coding GPT-6 Astra leads

C4ai Aya Expanse 8b: 33.8 (#252), GPT-6 Astra: 73.7 (#2)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Coding11601487
DeepSWE—74.1%
FrontierCode—53.3%
LMArena WebDev—1786
FrontierSWE—65.5%
SciCode—56.5%
GSO—79.4%
WeirdML—93.6%
MirrorCode—46.7%
ALE-Bench—2,951

Agentic & Tool Use Not comparable

C4ai Aya Expanse 8b: —, GPT-6 Astra: 52.9 (#3)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
APEX-Agents—64.7%
Remote Labor Index—20.8%
BALROG—68.3%
GDP.pdf—34.2%
Vending-Bench 2—15,515

Reasoning GPT-6 Astra leads

C4ai Aya Expanse 8b: 22.4 (#197), GPT-6 Astra: 85.1 (#1)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Hard Prompts11561462
ARC-AGI-2—95%
NYT Connections (extended)—98.1%
ARC-AGI-1—98.5%
CritPt—31.7%
Chess Puzzles—72%
EBR-Bench—76.2%
Mystery Game Puzzles—84%
DTBench—97.3%
LMCA—64.4%
Bench to the Future 3—0.14
Epoch Capabilities Index—166.45

Math GPT-6 Astra leads

C4ai Aya Expanse 8b: 33.3 (#203), GPT-6 Astra: 93.5 (#2)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Math11681465
FrontierMath (Tiers 1-3)—93.7%
FrontierMath Tier 4—97.6%
OTIS Mock AIME 2024-2025—100%
ProofBench—99%
FrontierMath Erdős—2.9%

Knowledge GPT-6 Astra leads

C4ai Aya Expanse 8b: 33.6 (#201), GPT-6 Astra: 75.3 (#1)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
Vectara Hallucination Rate9.5%8.7%
LMArena Expert11531483
GPQA Diamond—95.8%
Humanity's Last Exam—54.8%
SimpleQA Verified—75.6%

Multimodal Not comparable

C4ai Aya Expanse 8b: —, GPT-6 Astra: 55.0 (#3)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Vision—1281
Blueprint-Bench 2—49.7%
Furniture Assembly—80%
LMArena Document—1468

Multilingual GPT-6 Astra leads

C4ai Aya Expanse 8b: 36.1 (#242), GPT-6 Astra: 53.7 (#61)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Non-English11801430
LMArena Chinese11811484
LMArena German11881440
LMArena Japanese11201379
LMArena Russian11971436
LMArena French—1456
LMArena Korean—1426
LMArena Spanish—1407

Instruction Following GPT-6 Astra leads

C4ai Aya Expanse 8b: 60.1 (#253), GPT-6 Astra: 76.3 (#44)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Instruction Following11551450

Long Context GPT-6 Astra leads

C4ai Aya Expanse 8b: 36.1 (#236), GPT-6 Astra: 44.5 (#62)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Longer Query11911456

Writing & Preference GPT-6 Astra leads

C4ai Aya Expanse 8b: 39.0 (#250), GPT-6 Astra: 75.3 (#7)

BenchmarkC4ai Aya Expanse 8bGPT-6 Astra
LMArena Text11851441
LMArena Creative Writing11681418
LMArena Multi-Turn11601448
EQ-Bench Creative Writing—2173

Frequently asked questions

Is C4ai Aya Expanse 8b better than GPT-6 Astra?

GPT-6 Astra is the stronger model overall, scoring 70.8 to 34.9 on the Noometry Index.

Is C4ai Aya Expanse 8b or GPT-6 Astra better for coding?

GPT-6 Astra scores higher on coding benchmarks: 73.7 versus 33.8 in the Noometry coding category.

How many benchmarks do C4ai Aya Expanse 8b and GPT-6 Astra share?

15 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and GPT-6 Astra has 56.

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