Model comparison
C4ai Aya Expanse 8b vs Gemini 2.5 Flash
Gemini 2.5 Flash is the stronger model overall, scoring 39.3 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 Flash in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in multilingual, where Gemini 2.5 Flash leads 52.3 to 36.1.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.
Side by side
| C4ai Aya Expanse 8b | Gemini 2.5 Flash | |
|---|---|---|
| Provider | Cohere | |
| Noometry Index | 34.9 | 39.3 |
| Released | — | 2025-04-17 |
| Weights | Open | Proprietary |
| Context window | — | 1.05M |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.30 |
| Output $ / M tokens | — | $2.50 |
| Results tracked | 15 | 54 |
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Category by category
Coding Gemini 2.5 Flash leads
C4ai Aya Expanse 8b: 33.8 (#252), Gemini 2.5 Flash: 35.8 (#220)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Coding | 1160 | 1424 |
| SWE-bench Verified (bash only) | — | 28.7% |
| Aider Polyglot | — | 55.1% |
| WeirdML | — | 41.9% |
| ALE-Bench | — | 661.88 |
Agentic & Tool Use Not comparable
C4ai Aya Expanse 8b: —, Gemini 2.5 Flash: 30.8 (#74)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| Terminal-Bench | — | 17.1% |
| Berkeley Function Calling Leaderboard | — | 56.2% |
| TheAgentCompany | — | 41.1% |
| BALROG | — | 33.5% |
| Vending-Bench 2 | — | 548.84 |
Reasoning C4ai Aya Expanse 8b leads
C4ai Aya Expanse 8b: 22.4 (#197), Gemini 2.5 Flash: 18.1 (#286)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1422 |
| ARC-AGI-2 | — | 2.5% |
| SimpleBench | — | 41.2% |
| Kagi LLM Benchmark | — | 56.8% |
| ARC-AGI-1 | — | 33.3% |
| CritPt | — | 1.1% |
| EnigmaEval | — | 2.7% |
| DTBench | — | 76.5% |
| LMCA | — | 27.5% |
| Epoch Capabilities Index | — | 143.03 |
| ForecastBench | — | 60.6 |
Math Gemini 2.5 Flash leads
C4ai Aya Expanse 8b: 33.3 (#203), Gemini 2.5 Flash: 39.9 (#98)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Math | 1168 | 1415 |
| OTIS Mock AIME 2024-2025 | — | 73.1% |
| Omni-MATH | — | 38.5% |
| FrontierMath (Feb 2025 set) | — | 4.8% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Gemini 2.5 Flash leads
C4ai Aya Expanse 8b: 33.6 (#201), Gemini 2.5 Flash: 36.4 (#168)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| Vectara Hallucination Rate | 9.5% | 7.8% |
| LMArena Expert | 1153 | 1426 |
| Humanity's Last Exam | — | 12.1% |
| MMLU-Pro | — | 63.9% |
| Confabulations | — | 16.8% |
| GPQA (HELM) | — | 39% |
Multimodal Not comparable
C4ai Aya Expanse 8b: —, Gemini 2.5 Flash: 41.8 (#32)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Vision | — | 1253 |
| GeoBench | — | 76% |
| VPCT | — | 46.2% |
| SpatialViz-Bench | — | 36.9% |
Multilingual Gemini 2.5 Flash leads
C4ai Aya Expanse 8b: 36.1 (#242), Gemini 2.5 Flash: 52.3 (#88)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Non-English | 1180 | 1409 |
| LMArena Chinese | 1181 | 1450 |
| LMArena German | 1188 | 1418 |
| LMArena Japanese | 1120 | 1405 |
| LMArena Russian | 1197 | 1415 |
| LMArena French | — | 1433 |
| LMArena Korean | — | 1385 |
| LMArena Spanish | — | 1421 |
Instruction Following Gemini 2.5 Flash leads
C4ai Aya Expanse 8b: 60.1 (#253), Gemini 2.5 Flash: 75.7 (#54)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1155 | 1405 |
| IFEval | — | 89.8% |
Long Context Gemini 2.5 Flash leads
C4ai Aya Expanse 8b: 36.1 (#236), Gemini 2.5 Flash: 47.5 (#17)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Longer Query | 1191 | 1419 |
| Fiction.LiveBench | — | 77.8% |
Writing & Preference Gemini 2.5 Flash leads
C4ai Aya Expanse 8b: 39.0 (#250), Gemini 2.5 Flash: 53.8 (#157)
| Benchmark | C4ai Aya Expanse 8b | Gemini 2.5 Flash |
|---|---|---|
| LMArena Text | 1185 | 1417 |
| LMArena Creative Writing | 1168 | 1400 |
| LMArena Multi-Turn | 1160 | 1408 |
| Short-Story Creative Writing | — | 76.5% |
| EQ-Bench Creative Writing | — | 1137 |
| WildBench | — | 81.7% |
Frequently asked questions
Is C4ai Aya Expanse 8b better than Gemini 2.5 Flash?
Gemini 2.5 Flash is the stronger model overall, scoring 39.3 to 34.9 on the Noometry Index.
Is C4ai Aya Expanse 8b or Gemini 2.5 Flash better for coding?
Gemini 2.5 Flash scores higher on coding benchmarks: 35.8 versus 33.8 in the Noometry coding category.
How many benchmarks do C4ai Aya Expanse 8b and Gemini 2.5 Flash share?
15 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Gemini 2.5 Flash has 54.