Model comparison
Claude Fable 5.1 vs Solar Pro 3
Claude Fable 5.1 has enough public results to be ranked (#2); Solar Pro 3 does not yet, so treat this comparison as directional.
Last verified . 2 shared benchmarks.
UpstageSummary
- They share 2 benchmarks with published results for both. Claude Fable 5.1 scores higher in 2 categories and Solar Pro 3 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Fable 5.1 leads 76.7 to 22.4.
- The biggest single-benchmark swing is SciCode: 63.1% for Claude Fable 5.1 and 24.7% for Solar Pro 3.
- Solar Pro 3 is cheaper at $0.25 / $0.25 per million input/output tokens, against $10 / $50 for Claude Fable 5.1.
- Claude Fable 5.1 accepts more context: 1M tokens versus 131K.
Side by side
| Claude Fable 5.1 | Solar Pro 3 | |
|---|---|---|
| Provider | Anthropic | Upstage |
| Noometry Index | 69.0 | 33.9 |
| Released | 2026-09-01 | 2026-01 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 131K |
| Max output | 128K | 8K |
| Input $ / M tokens | $10 | $0.25 |
| Output $ / M tokens | $50 | $0.25 |
| Results tracked | 52 | 2 |
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Category by category
Coding Claude Fable 5.1 leads
Claude Fable 5.1: 74.7 (#1), Solar Pro 3: 34.8
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| SciCode | 63.1% | 24.7% |
| FrontierCode | 50.9% | — |
| CursorBench | 51.8% | — |
| LMArena WebDev | 1744 | — |
| FrontierSWE | 56.3% | — |
| GSO | 88.2% | — |
| WeirdML | 92.9% | — |
| LMArena Coding | 1528 | — |
| MirrorCode | 73.3% | — |
| ALE-Bench | 2,143 | — |
Agentic & Tool Use Not comparable
Claude Fable 5.1: 50.7 (#5), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| 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), Solar Pro 3: 22.4
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| CritPt | 31.1% | 0% |
| ARC-AGI-2 | 90% | — |
| NYT Connections (extended) | 90% | — |
| ARC-AGI-1 | 97.5% | — |
| Chess Puzzles | 47% | — |
| EBR-Bench | 57.1% | — |
| LMArena Hard Prompts | 1526 | — |
| Mystery Game Puzzles | 58% | — |
| DTBench | 97.6% | — |
| LMCA | 65.5% | — |
| Epoch Capabilities Index | 164.7 | — |
Math Not comparable
Claude Fable 5.1: 89.6 (#4), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 90.2% | — |
| FrontierMath Tier 4 | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | 1525 | — |
| FrontierMath Erdős | 0% | — |
Knowledge Not comparable
Claude Fable 5.1: 69.6 (#6), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| Humanity's Last Exam | 46.5% | — |
| SimpleQA Verified | 70.8% | — |
| LMArena Expert | 1535 | — |
Multimodal Not comparable
Claude Fable 5.1: 53.9 (#4), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| LMArena Vision | 1318 | — |
| Blueprint-Bench 2 | 41.9% | — |
| Furniture Assembly | 70% | — |
| LMArena Document | 1513 | — |
Multilingual Not comparable
Claude Fable 5.1: 59.1 (#3), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| LMArena Non-English | 1507 | — |
| LMArena Chinese | 1586 | — |
| LMArena French | 1525 | — |
| LMArena German | 1500 | — |
| LMArena Japanese | 1543 | — |
| LMArena Korean | 1534 | — |
| LMArena Russian | 1521 | — |
| LMArena Spanish | 1516 | — |
Instruction Following Not comparable
Claude Fable 5.1: 79.2 (#6), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| LMArena Instruction Following | 1517 | — |
Long Context Not comparable
Claude Fable 5.1: 46.7 (#20), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| LMArena Longer Query | 1522 | — |
Writing & Preference Not comparable
Claude Fable 5.1: 79.2 (#2), Solar Pro 3: —
| Benchmark | Claude Fable 5.1 | Solar Pro 3 |
|---|---|---|
| LMArena Text | 1510 | — |
| LMArena Creative Writing | 1507 | — |
| EQ-Bench Creative Writing | 2162 | — |
| LMArena Multi-Turn | 1492 | — |
Frequently asked questions
Is Claude Fable 5.1 better than Solar Pro 3?
Claude Fable 5.1 has enough public results to be ranked (#2); Solar Pro 3 does not yet, so treat this comparison as directional.
Which is cheaper, Claude Fable 5.1 or Solar Pro 3?
Solar Pro 3 is cheaper. It lists at $0.25 per million input tokens and $0.25 per million output tokens; Claude Fable 5.1 lists at $10 and $50.
Is Claude Fable 5.1 or Solar Pro 3 better for coding?
Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 34.8 in the Noometry coding category.
Which has the bigger context window?
Claude Fable 5.1 does, with 1M tokens against 131K.
How many benchmarks do Claude Fable 5.1 and Solar Pro 3 share?
2 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Solar Pro 3 has 2.