Model comparison
Claude Fable 5.1 vs Gemini 1.5 Flash 8B
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 29.9 on the Noometry Index.
Last verified . 20 shared benchmarks.
GoogleSummary
- They share 20 benchmarks with published results for both. Claude Fable 5.1 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 math, where Claude Fable 5.1 leads 89.6 to 14.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Fable 5.1 and 4.6% for Gemini 1.5 Flash 8B.
Side by side
| Claude Fable 5.1 | Gemini 1.5 Flash 8B | |
|---|---|---|
| Provider | Anthropic | |
| Noometry Index | 69.0 | 29.9 |
| Released | 2026-09-01 | 2024-10-03 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $10 | — |
| Output $ / M tokens | $50 | — |
| Results tracked | 52 | 21 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 74.7 (#1), Gemini 1.5 Flash 8B: 35.5 (#225)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Coding | 1528 | 1218 |
| FrontierCode | 50.9% | — |
| CursorBench | 51.8% | — |
| LMArena WebDev | 1744 | — |
| FrontierSWE | 56.3% | — |
| SciCode | 63.1% | — |
| GSO | 88.2% | — |
| WeirdML | 92.9% | — |
| MirrorCode | 73.3% | — |
| ALE-Bench | 2,143 | — |
Agentic & Tool Use Not comparable
Claude Fable 5.1: 50.7 (#5), Gemini 1.5 Flash 8B: —
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| APEX-Agents | 68.6% | — |
| Remote Labor Index | 17.9% | — |
| GDP.pdf | 29.6% | — |
| Vending-Bench 2 | 5,422 | — |
Reasoning Claude Fable 5.1 leads
Claude Fable 5.1: 76.7 (#7), Gemini 1.5 Flash 8B: 20.0 (#244)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Hard Prompts | 1526 | 1209 |
| DTBench | 97.6% | 50% |
| ARC-AGI-2 | 90% | — |
| NYT Connections (extended) | 90% | — |
| ARC-AGI-1 | 97.5% | — |
| CritPt | 31.1% | — |
| Chess Puzzles | 47% | — |
| EBR-Bench | 57.1% | — |
| Mystery Game Puzzles | 58% | — |
| LMCA | 65.5% | — |
| Epoch Capabilities Index | 164.7 | — |
Math Claude Fable 5.1 leads
Claude Fable 5.1: 89.6 (#4), Gemini 1.5 Flash 8B: 14.2 (#302)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 4.6% |
| LMArena Math | 1525 | 1207 |
| FrontierMath (Tiers 1-3) | 90.2% | — |
| FrontierMath Tier 4 | 87.8% | — |
| ProofBench | 100% | — |
| FrontierMath Erdős | 0% | — |
Knowledge Claude Fable 5.1 leads
Claude Fable 5.1: 69.6 (#6), Gemini 1.5 Flash 8B: 16.0 (#289)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Expert | 1535 | 1185 |
| GPQA Diamond | — | 33% |
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
Multimodal Claude Fable 5.1 leads
Claude Fable 5.1: 53.9 (#4), Gemini 1.5 Flash 8B: 28.2 (#115)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Vision | 1318 | 1044 |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |
Multilingual Claude Fable 5.1 leads
Claude Fable 5.1: 59.1 (#3), Gemini 1.5 Flash 8B: 38.5 (#229)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Non-English | 1507 | 1215 |
| LMArena Chinese | 1586 | 1231 |
| LMArena French | 1525 | 1234 |
| LMArena German | 1500 | 1206 |
| LMArena Japanese | 1543 | 1150 |
| LMArena Korean | 1534 | 1140 |
| LMArena Russian | 1521 | 1236 |
| LMArena Spanish | 1516 | 1212 |
Instruction Following Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#6), Gemini 1.5 Flash 8B: 62.8 (#236)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Instruction Following | 1517 | 1199 |
Long Context Claude Fable 5.1 leads
Claude Fable 5.1: 46.7 (#20), Gemini 1.5 Flash 8B: 37.0 (#225)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Longer Query | 1522 | 1219 |
Writing & Preference Claude Fable 5.1 leads
Claude Fable 5.1: 79.2 (#2), Gemini 1.5 Flash 8B: 42.8 (#232)
| Benchmark | Claude Fable 5.1 | Gemini 1.5 Flash 8B |
|---|---|---|
| LMArena Text | 1510 | 1226 |
| LMArena Creative Writing | 1507 | 1218 |
| LMArena Multi-Turn | 1492 | 1185 |
| EQ-Bench Creative Writing | 2162 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Gemini 1.5 Flash 8B?
Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 29.9 on the Noometry Index.
Is Claude Fable 5.1 or Gemini 1.5 Flash 8B better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 35.5 in the Noometry coding category.
How many benchmarks do Claude Fable 5.1 and Gemini 1.5 Flash 8B share?
20 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Gemini 1.5 Flash 8B has 21.