Model comparison
C4ai Aya Expanse 8b vs Gemini 2.5 Pro
Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 34.9 on the Noometry Index.
Last verified . 15 shared benchmarks.
Cohere
GoogleSummary
- They share 15 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 1 category and Gemini 2.5 Pro in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Gemini 2.5 Pro leads 63.7 to 39.0.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.
Side by side
| C4ai Aya Expanse 8b | Gemini 2.5 Pro | |
|---|---|---|
| Provider | Cohere | |
| Noometry Index | 34.9 | 45.0 |
| Released | — | 2025-03-25 |
| Weights | Open | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $10 |
| Results tracked | 15 | 78 |
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Category by category
Coding Gemini 2.5 Pro leads
C4ai Aya Expanse 8b: 33.8 (#252), Gemini 2.5 Pro: 42.4 (#101)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Coding | 1160 | 1452 |
| SWE-bench Verified | — | 57.6% |
| SWE-bench Verified (bash only) | — | 53.6% |
| Aider Polyglot | — | 83.1% |
| LMArena WebDev | — | 1227 |
| SciCode | — | 42.8% |
| GSO | — | 3.9% |
| WeirdML | — | 54% |
| LiveBench Coding | — | 85.9% |
| CadEval | — | 64% |
| ALE-Bench | — | 785.52 |
| AlgoTune | — | 1.51 |
Agentic & Tool Use Not comparable
C4ai Aya Expanse 8b: —, Gemini 2.5 Pro: 29.2 (#88)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| Terminal-Bench | — | 32.6% |
| GDPval | — | 23.3% |
| Remote Labor Index | — | 0.8% |
| TheAgentCompany | — | 30.3% |
| τ²-bench Banking | — | 13.7% |
| DeepResearch Bench | — | 42.8% |
| BALROG | — | 43.3% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 55.4% |
| Vending-Bench 2 | — | 573.64 |
Reasoning Gemini 2.5 Pro leads
C4ai Aya Expanse 8b: 22.4 (#197), Gemini 2.5 Pro: 28.8 (#99)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1455 |
| ARC-AGI-2 | — | 4.9% |
| SimpleBench | — | 62.4% |
| Kagi LLM Benchmark | — | 70.3% |
| ARC-AGI-1 | — | 41% |
| CritPt | — | 2% |
| Chess Puzzles | — | 20% |
| EnigmaEval | — | 5.6% |
| LiveBench Reasoning | — | 89.8% |
| DTBench | — | 82.4% |
| LiveBench Data Analysis | — | 79.9% |
| LMCA | — | 34.8% |
| Epoch Capabilities Index | — | 145.32 |
| ForecastBench | — | 61.3 |
| LiveBench | — | 82.3% |
Math Too close to call
C4ai Aya Expanse 8b: 33.3 (#203), Gemini 2.5 Pro: 32.5 (#213)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Math | 1168 | 1450 |
| FrontierMath (Tiers 1-3) | — | 24.6% |
| FrontierMath Tier 4 | — | 0% |
| OTIS Mock AIME 2024-2025 | — | 84.7% |
| Omni-MATH | — | 41.6% |
| LiveBench Math | — | 90.2% |
| MATH Level 5 | — | 95.9% |
| FrontierMath (Feb 2025 set) | — | 14.1% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Gemini 2.5 Pro leads
C4ai Aya Expanse 8b: 33.6 (#201), Gemini 2.5 Pro: 56.0 (#46)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | 7% |
| LMArena Expert | 1153 | 1452 |
| GPQA Diamond | — | 85.3% |
| Humanity's Last Exam | — | 21.6% |
| MMLU-Pro | — | 86.3% |
| Confabulations | — | 10.6% |
| GPQA (HELM) | — | 74.9% |
Multimodal Not comparable
C4ai Aya Expanse 8b: —, Gemini 2.5 Pro: 45.2 (#18)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Vision | — | 1263 |
| GeoBench | — | 86% |
| VPCT | — | 48% |
| LMArena Document | — | 1421 |
| SpatialViz-Bench | — | 44.7% |
Multilingual Gemini 2.5 Pro leads
C4ai Aya Expanse 8b: 36.1 (#242), Gemini 2.5 Pro: 55.3 (#31)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Non-English | 1180 | 1451 |
| LMArena Chinese | 1181 | 1507 |
| LMArena German | 1188 | 1487 |
| LMArena Japanese | 1120 | 1461 |
| LMArena Russian | 1197 | 1461 |
| LMArena French | — | 1472 |
| LMArena Korean | — | 1434 |
| LMArena Spanish | — | 1473 |
Instruction Following Gemini 2.5 Pro leads
C4ai Aya Expanse 8b: 60.1 (#253), Gemini 2.5 Pro: 75.0 (#75)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1155 | 1437 |
| LiveBench Instruction Following | — | 80.6% |
| IFEval | — | 84% |
Long Context Gemini 2.5 Pro leads
C4ai Aya Expanse 8b: 36.1 (#236), Gemini 2.5 Pro: 59.8 (#5)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Longer Query | 1191 | 1449 |
| Fiction.LiveBench | — | 91.7% |
Writing & Preference Gemini 2.5 Pro leads
C4ai Aya Expanse 8b: 39.0 (#250), Gemini 2.5 Pro: 63.7 (#62)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Pro |
|---|---|---|
| LMArena Text | 1185 | 1458 |
| LMArena Creative Writing | 1168 | 1454 |
| LMArena Multi-Turn | 1160 | 1453 |
| Short-Story Creative Writing | — | 83.8% |
| EQ-Bench Creative Writing | — | 1421 |
| WildBench | — | 85.7% |
| LiveBench Language | — | 67.8% |
Frequently asked questions
Is C4ai Aya Expanse 8b better than Gemini 2.5 Pro?
Gemini 2.5 Pro is the stronger model overall, scoring 45.0 to 34.9 on the Noometry Index.
Is C4ai Aya Expanse 8b or Gemini 2.5 Pro better for coding?
Gemini 2.5 Pro scores higher on coding benchmarks: 42.4 versus 33.8 in the Noometry coding category.
How many benchmarks do C4ai Aya Expanse 8b and Gemini 2.5 Pro share?
15 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Gemini 2.5 Pro has 78.