Model comparison
Claude Sonnet 5.5 vs Solar Pro 3
Claude Sonnet 5.5 has enough public results to be ranked (#10); 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 Sonnet 5.5 scores higher in 2 categories and Solar Pro 3 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Claude Sonnet 5.5 leads 65.5 to 34.2.
- The biggest single-benchmark swing is SciCode: 61% for Claude Sonnet 5.5 and 24.7% for Solar Pro 3.
- Solar Pro 3 is cheaper at $0.25 / $0.25 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 131K.
Side by side
| Claude Sonnet 5.5 | Solar Pro 3 | |
|---|---|---|
| Provider | Anthropic | Upstage |
| Noometry Index | 60.5 | 33.3 |
| Released | 2026-09-28 | 2026-01 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 131K |
| Max output | 128K | 8K |
| Input $ / M tokens | $2 | $0.25 |
| Output $ / M tokens | $10 | $0.25 |
| Results tracked | 16 | 2 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 65.5 (#6), Solar Pro 3: 34.2
| Benchmark | Claude Sonnet 5.5 | Solar Pro 3 |
|---|---|---|
| SciCode | 61% | 24.7% |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 44.9 (#14), Solar Pro 3: —
| Benchmark | Claude Sonnet 5.5 | Solar Pro 3 |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 52.4 (#29), Solar Pro 3: 21.7
| Benchmark | Claude Sonnet 5.5 | Solar Pro 3 |
|---|---|---|
| CritPt | 31.4% | 0% |
| Mystery Game Puzzles | 65% | — |
Math Not comparable
Claude Sonnet 5.5: 88.7 (#4), Solar Pro 3: —
| Benchmark | Claude Sonnet 5.5 | Solar Pro 3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
Knowledge Not comparable
Claude Sonnet 5.5: 66.0 (#11), Solar Pro 3: —
| Benchmark | Claude Sonnet 5.5 | Solar Pro 3 |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Not comparable
Claude Sonnet 5.5: 53.2 (#5), Solar Pro 3: —
| Benchmark | Claude Sonnet 5.5 | Solar Pro 3 |
|---|---|---|
| Furniture Assembly | 75% | — |
Frequently asked questions
Is Claude Sonnet 5.5 better than Solar Pro 3?
Claude Sonnet 5.5 has enough public results to be ranked (#10); Solar Pro 3 does not yet, so treat this comparison as directional.
Which is cheaper, Claude Sonnet 5.5 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 Sonnet 5.5 lists at $2 and $10.
Is Claude Sonnet 5.5 or Solar Pro 3 better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 34.2 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 5.5 does, with 1M tokens against 131K.
How many benchmarks do Claude Sonnet 5.5 and Solar Pro 3 share?
2 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Solar Pro 3 has 2.