Model comparison
Claude 3.5 Sonnet vs Mercury 2.5
Claude 3.5 Sonnet is the stronger model overall, scoring 34.6 to 33.5 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in math, where Mercury 2.5 leads 23.3 to 19.2.
Side by side
| Claude 3.5 Sonnet | Mercury 2.5 | |
|---|---|---|
| Provider | Anthropic | Inception |
| Noometry Index | 34.6 | 33.5 |
| Released | 2024-06-20 | 2026-09-08 |
| Weights | Proprietary | Proprietary |
| Context window | — | 260K |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.04 |
| Output $ / M tokens | — | $0.15 |
| Results tracked | 60 | 4 |
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Category by category
Coding Too close to call
Claude 3.5 Sonnet: 39.0 (#165), Mercury 2.5: 39.5 (#156)
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| Aider Polyglot | 51.6% | — |
| SciCode | — | 38.5% |
| GSO | 4.6% | — |
| WeirdML | 40% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| LMArena Coding | 1342 | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| ALE-Bench | — | 301.65 |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |
Agentic & Tool Use Not comparable
Claude 3.5 Sonnet: 32.3 (#67), Mercury 2.5: —
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| TheAgentCompany | 24% | — |
| Cybench | 17.5% | — |
| BALROG | 32.6% | — |
| METR Time Horizons | 45.2% | — |
Reasoning Too close to call
Claude 3.5 Sonnet: 23.1 (#183), Mercury 2.5: 22.4 (#193)
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| SimpleBench | 41.4% | — |
| CritPt | — | 0% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| LMArena Hard Prompts | 1305 | — |
| DTBench | 67.8% | — |
| LiveBench Data Analysis | 55% | — |
| Epoch Capabilities Index | 133.55 | — |
| ForecastBench | 60.7 | — |
| LiveBench | 59% | — |
Math Mercury 2.5 leads
Claude 3.5 Sonnet: 19.2 (#288), Mercury 2.5: 23.3 (#272)
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | — |
| ProofBench | — | 3% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| LMArena Math | 1307 | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Not comparable
Claude 3.5 Sonnet: 28.6 (#245), Mercury 2.5: —
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| GPQA Diamond | 55.3% | — |
| Humanity's Last Exam | 4.1% | — |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| LMArena Expert | 1265 | — |
| MMLU | 87.3% | — |
Multimodal Not comparable
Claude 3.5 Sonnet: 26.5 (#120), Mercury 2.5: —
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| LMArena Vision | 1125 | — |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
Multilingual Not comparable
Claude 3.5 Sonnet: 43.2 (#185), Mercury 2.5: —
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1283 | — |
| LMArena Chinese | 1272 | — |
| LMArena French | 1305 | — |
| LMArena German | 1297 | — |
| LMArena Japanese | 1234 | — |
| LMArena Korean | 1200 | — |
| LMArena Russian | 1306 | — |
| LMArena Spanish | 1290 | — |
Instruction Following Not comparable
Claude 3.5 Sonnet: 68.8 (#182), Mercury 2.5: —
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |
| LMArena Instruction Following | 1297 | — |
Long Context Not comparable
Claude 3.5 Sonnet: 39.9 (#167), Mercury 2.5: —
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| LMArena Longer Query | 1311 | — |
Writing & Preference Not comparable
Claude 3.5 Sonnet: 52.9 (#164), Mercury 2.5: —
| Benchmark | Claude 3.5 Sonnet | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1298 | — |
| LMArena Creative Writing | 1292 | — |
| Short-Story Creative Writing | 80.3% | — |
| EQ-Bench Creative Writing | 1451 | — |
| WildBench | 79.2% | — |
| LMArena Multi-Turn | 1326 | — |
| LiveBench Language | 53.8% | — |
Frequently asked questions
Is Claude 3.5 Sonnet better than Mercury 2.5?
Claude 3.5 Sonnet is the stronger model overall, scoring 34.6 to 33.5 on the Noometry Index.
Is Claude 3.5 Sonnet or Mercury 2.5 better for coding?
They score almost the same on coding (39.0 vs 39.5); test both on your own repository before choosing.
How many benchmarks do Claude 3.5 Sonnet and Mercury 2.5 share?
0 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Mercury 2.5 has 4.