Model comparison
Claude Sonnet 4.5 vs Gemini 1.5 Flash 8B
Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 29.7 on the Noometry Index.
Last verified . 20 shared benchmarks.
GoogleSummary
- They share 20 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 9 categories and Gemini 1.5 Flash 8B in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Sonnet 4.5 leads 48.4 to 16.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 77.8% for Claude Sonnet 4.5 and 4.6% for Gemini 1.5 Flash 8B.
Side by side
| Claude Sonnet 4.5 | Gemini 1.5 Flash 8B | |
|---|---|---|
| Provider | Anthropic | |
| Noometry Index | 44.0 | 29.7 |
| Released | 2025-09-29 | 2024-10-03 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 64K | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 73 | 21 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.8 (#54), Gemini 1.5 Flash 8B: 34.9 (#221)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Coding | 1489 | 1218 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.5: 38.1 (#30), Gemini 1.5 Flash 8B: —
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| LMArena Search | 1159 | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |
Reasoning Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 26.9 (#113), Gemini 1.5 Flash 8B: 19.2 (#242)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1210 |
| DTBench | 83.2% | 50% |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | 37.3% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| LMCA | 38.8% | — |
| Epoch Capabilities Index | 146.84 | — |
| ForecastBench | 61.9 | — |
Math Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 31.9 (#190), Gemini 1.5 Flash 8B: 13.3 (#296)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 77.8% | 4.6% |
| LMArena Math | 1448 | 1207 |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 48.4 (#70), Gemini 1.5 Flash 8B: 16.0 (#285)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| GPQA Diamond | 82.3% | 33% |
| LMArena Expert | 1483 | 1185 |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
Multimodal Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 34.1 (#84), Gemini 1.5 Flash 8B: 27.6 (#110)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Vision | — | 1044 |
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 53.6 (#65), Gemini 1.5 Flash 8B: 38.6 (#224)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Non-English | 1425 | 1215 |
| LMArena Chinese | 1459 | 1231 |
| LMArena French | 1459 | 1233 |
| LMArena German | 1427 | 1206 |
| LMArena Japanese | 1390 | 1150 |
| LMArena Korean | 1403 | 1140 |
| LMArena Russian | 1436 | 1236 |
| LMArena Spanish | 1457 | 1212 |
Instruction Following Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 75.2 (#74), Gemini 1.5 Flash 8B: 63.1 (#231)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Instruction Following | 1459 | 1199 |
| IFEval | 85% | — |
Long Context Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 45.2 (#45), Gemini 1.5 Flash 8B: 36.9 (#220)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Longer Query | 1476 | 1219 |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.7 (#33), Gemini 1.5 Flash 8B: 43.0 (#227)
| Benchmark | Claude Sonnet 4.5 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Text | 1439 | 1226 |
| LMArena Creative Writing | 1442 | 1218 |
| LMArena Multi-Turn | 1465 | 1185 |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than Gemini 1.5 Flash 8B?
Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 29.7 on the Noometry Index.
Is Claude Sonnet 4.5 or Gemini 1.5 Flash 8B better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 34.9 in the Noometry coding category.
How many benchmarks do Claude Sonnet 4.5 and Gemini 1.5 Flash 8B share?
20 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Gemini 1.5 Flash 8B has 21.