Model comparison
Claude Sonnet 5.5 vs Step 1o Turbo 202506
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 39.7 on the Noometry Index.
Last verified . 13 shared benchmarks.
StepFunSummary
- They share 13 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 9 categories and Step 1o Turbo 202506 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 36.6.
Side by side
| Claude Sonnet 5.5 | Step 1o Turbo 202506 | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 61.9 | 39.7 |
| Released | 2026-09-28 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 32 | 14 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), Step 1o Turbo 202506: 39.2 (#160)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Coding | 1513 | 1339 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 45.0 (#16), Step 1o Turbo 202506: —
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), Step 1o Turbo 202506: 26.8 (#129)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1335 |
| NYT Connections (extended) | 80.5% | — |
| CritPt | 31.4% | — |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | 165.03 | — |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 87.9 (#6), Step 1o Turbo 202506: 36.6 (#164)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Math | 1510 | 1318 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#12), Step 1o Turbo 202506: 36.1 (#176)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Expert | 1540 | 1308 |
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 51.5 (#6), Step 1o Turbo 202506: 36.1 (#80)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Vision | 1289 | 1186 |
| Furniture Assembly | 75% | — |
Multilingual Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 55.3 (#30), Step 1o Turbo 202506: 45.3 (#173)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Non-English | 1452 | 1313 |
| LMArena Chinese | 1522 | 1380 |
| LMArena Russian | 1451 | 1327 |
| LMArena German | — | 1314 |
Instruction Following Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 78.3 (#11), Step 1o Turbo 202506: 69.2 (#176)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Instruction Following | 1495 | 1310 |
Long Context Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.9 (#28), Step 1o Turbo 202506: 41.0 (#146)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Longer Query | 1498 | 1348 |
Writing & Preference Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#40), Step 1o Turbo 202506: 53.1 (#160)
| Benchmark | Claude Sonnet 5.5 | Step 1o Turbo 202506 |
|---|---|---|
| LMArena Text | 1471 | 1336 |
| LMArena Creative Writing | 1465 | 1307 |
| LMArena Multi-Turn | 1474 | 1340 |
Frequently asked questions
Is Claude Sonnet 5.5 better than Step 1o Turbo 202506?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 39.7 on the Noometry Index.
Is Claude Sonnet 5.5 or Step 1o Turbo 202506 better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 39.2 in the Noometry coding category.
How many benchmarks do Claude Sonnet 5.5 and Step 1o Turbo 202506 share?
13 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Step 1o Turbo 202506 has 14.