Model comparison
C4ai Aya Expanse 8b vs Claude Sonnet 5
Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 34.9 on the Noometry Index.
Last verified . 14 shared benchmarks.
CohereSummary
- They share 14 benchmarks with published results for both. C4ai Aya Expanse 8b scores higher in 0 categories and Claude Sonnet 5 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5 leads 66.2 to 33.3.
- C4ai Aya Expanse 8b has downloadable open weights; the other is API-only.
Side by side
| C4ai Aya Expanse 8b | Claude Sonnet 5 | |
|---|---|---|
| Provider | Cohere | Anthropic |
| Noometry Index | 34.9 | 54.6 |
| Released | — | 2026-06-29 |
| Weights | Open | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $2 |
| Output $ / M tokens | — | $10 |
| Results tracked | 15 | 51 |
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Category by category
Coding Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 33.8 (#252), Claude Sonnet 5: 55.5 (#26)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Coding | 1160 | 1483 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.7% |
| CursorBench | — | 34.1% |
| LMArena WebDev | — | 1541 |
| SciCode | — | 54.3% |
| GSO | — | 37.3% |
| WeirdML | — | 68.8% |
| ALE-Bench | — | 1,463 |
Agentic & Tool Use Not comparable
C4ai Aya Expanse 8b: —, Claude Sonnet 5: 42.8 (#18)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| APEX-Agents | — | 54.5% |
| GBAEval | — | 65.3% |
| LMArena Search | — | 1194 |
| Vending-Bench 2 | — | 6,378 |
Reasoning Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 22.4 (#197), Claude Sonnet 5: 49.1 (#39)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Hard Prompts | 1156 | 1461 |
| SimpleBench | — | 60.6% |
| NYT Connections (extended) | — | 75.1% |
| CritPt | — | 16.9% |
| Chess Puzzles | — | 35% |
| Mystery Game Puzzles | — | 35% |
| DTBench | — | 92.5% |
| LMCA | — | 50% |
| Surface Evolver Bench | — | 60% |
| Bench to the Future 3 | — | 0.14 |
| Epoch Capabilities Index | — | 156.21 |
| ForecastBench | — | 61.1 |
Math Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 33.3 (#203), Claude Sonnet 5: 66.2 (#27)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Math | 1168 | 1467 |
| FrontierMath (Tiers 1-3) | — | 65.6% |
| FrontierMath Tier 4 | — | 29.3% |
| OTIS Mock AIME 2024-2025 | — | 94.7% |
| ProofBench | — | 77% |
Knowledge Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 33.6 (#201), Claude Sonnet 5: 55.6 (#47)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Expert | 1153 | 1490 |
| GPQA Diamond | — | 90.5% |
| SimpleQA Verified | — | 33.7% |
| Vectara Hallucination Rate | 9.5% | — |
Multimodal Not comparable
C4ai Aya Expanse 8b: —, Claude Sonnet 5: 42.4 (#31)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Vision | — | 1274 |
| Blueprint-Bench 2 | — | 24.9% |
| LMArena Document | — | 1466 |
Multilingual Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 36.1 (#242), Claude Sonnet 5: 53.8 (#55)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Non-English | 1180 | 1431 |
| LMArena Chinese | 1181 | 1477 |
| LMArena German | 1188 | 1440 |
| LMArena Japanese | 1120 | 1422 |
| LMArena Russian | 1197 | 1451 |
| LMArena French | — | 1460 |
| LMArena Korean | — | 1411 |
| LMArena Spanish | — | 1437 |
Instruction Following Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 60.1 (#253), Claude Sonnet 5: 76.3 (#41)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Instruction Following | 1155 | 1452 |
Long Context Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 36.1 (#236), Claude Sonnet 5: 44.8 (#55)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Longer Query | 1191 | 1463 |
Writing & Preference Claude Sonnet 5 leads
C4ai Aya Expanse 8b: 39.0 (#250), Claude Sonnet 5: 69.2 (#25)
| Benchmark | C4ai Aya Expanse 8b | Claude Sonnet 5 |
|---|---|---|
| LMArena Text | 1185 | 1442 |
| LMArena Creative Writing | 1168 | 1416 |
| LMArena Multi-Turn | 1160 | 1454 |
| EQ-Bench Creative Writing | — | 1794 |
| EQ-Bench 4 | — | 1236 |
Frequently asked questions
Is C4ai Aya Expanse 8b better than Claude Sonnet 5?
Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 34.9 on the Noometry Index.
Is C4ai Aya Expanse 8b or Claude Sonnet 5 better for coding?
Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 33.8 in the Noometry coding category.
How many benchmarks do C4ai Aya Expanse 8b and Claude Sonnet 5 share?
14 benchmarks have published results for both models. C4ai Aya Expanse 8b has 15 scored results on Noometry and Claude Sonnet 5 has 51.