Model comparison
Claude Sonnet 5.5 vs o1-pro
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 31.2 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in knowledge, where Claude Sonnet 5.5 leads 66.0 to 29.3.
- Claude Sonnet 5.5 is cheaper at $2 / $10 per million input/output tokens, against $150 / $600 for o1-pro.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 200K.
Side by side
| Claude Sonnet 5.5 | o1-pro | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 60.5 | 31.2 |
| Released | 2026-09-28 | 2025-03-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 200K |
| Max output | 128K | 100K |
| Input $ / M tokens | $2 | $150 |
| Output $ / M tokens | $10 | $600 |
| Results tracked | 16 | 3 |
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Category by category
Coding Not comparable
Claude Sonnet 5.5: 65.5 (#6), o1-pro: —
| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 44.9 (#14), o1-pro: —
| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 52.4 (#29), o1-pro: 20.2 (#223)
| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| ARC-AGI-1 | — | 23.3% |
| CritPt | 31.4% | — |
| EnigmaEval | — | 6.1% |
| Mystery Game Puzzles | 65% | — |
Math Not comparable
Claude Sonnet 5.5: 88.7 (#4), o1-pro: —
| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#11), o1-pro: 29.3 (#227)
| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| Humanity's Last Exam | — | 8.1% |
| SimpleQA Verified | 46.5% | — |
Multimodal Not comparable
Claude Sonnet 5.5: 53.2 (#5), o1-pro: —
| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| Furniture Assembly | 75% | — |
Frequently asked questions
Is Claude Sonnet 5.5 better than o1-pro?
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 31.2 on the Noometry Index.
Which is cheaper, Claude Sonnet 5.5 or o1-pro?
Claude Sonnet 5.5 is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; o1-pro lists at $150 and $600.
Which has the bigger context window?
Claude Sonnet 5.5 does, with 1M tokens against 200K.
How many benchmarks do Claude Sonnet 5.5 and o1-pro share?
0 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and o1-pro has 3.