Model comparison
Claude Sonnet 4.5 vs o1
Head-to-head evidence from 2 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Sonnet 4.5 #98 (Estimated); o1 #136 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Sonnet 4.5 and o1 share 2 comparable benchmark results. 2 of 8 categories are comparable. 10 results are unique to Claude Sonnet 4.5; 14 to o1.
Updated July 24, 2026- Shared results
- 2
- Claude Sonnet 4.5 only
- 10
- o1 only
- 14
- Comparable categories
- 2 / 8
Pick Claude Sonnet 4.5 if you want the stronger benchmark profile. o1 only becomes the better choice if you want the stronger reasoning-first profile.
Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 2 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Sonnet 4.5 is clearly ahead on the BenchAlign aggregate, 52.89 to 47.14. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Sonnet 4.5's sharpest advantage is in knowledge, where it averages 83.4 against 75.7. The single biggest benchmark swing on the page is GPQA, 83.4% to 75.7%.
o1 is also the more expensive model on tokens at $15.00 input / $60.00 output per 1M tokens, versus $3.00 input / $15.00 output per 1M tokens for Claude Sonnet 4.5. That is roughly 4.0x on output cost alone. o1 is the reasoning model in the pair, while Claude Sonnet 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude Sonnet 4.5 | Δ | o1 |
|---|---|---|---|
| Knowledge | Claude Sonnet 4.583.4 | Margin← 7.7 | o175.7 |
| Math | Claude Sonnet 4.511.2 | Margin← 1.9 | o19.3 |
| Agentic | Claude Sonnet 4.555.4 | MarginNo overlap | o1Not measured |
| Coding | Claude Sonnet 4.577.2 | MarginNo overlap | o1Not measured |
| Reasoning | Claude Sonnet 4.513.6 | MarginNo overlap | o1Not measured |
| Inst. Following | Claude Sonnet 4.5Not measured | MarginNo overlap | o192.2 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
GPQA
KnowledgeA 83.4%B 75.7%Winner: Claude Sonnet 4.5Δ 7.7GPQA: Claude Sonnet 4.5 scored 83.4%; o1 scored 75.7%. Claude Sonnet 4.5 wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 13.495%B 9.310%Winner: Claude Sonnet 4.5Δ 4.2FrontierMath v2 (Tiers 1-3): Claude Sonnet 4.5 scored 13.495%; o1 scored 9.310%. Claude Sonnet 4.5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Sonnet 4.5 | o1 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Sonnet 4.5$3 input / $15 output | o1$15 input / $60 output | Claude Sonnet 4.5 has the lower combined listed price. |
| Generation speedtokens per second | Claude Sonnet 4.5Not available | o198 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Sonnet 4.5Not available | o132.29 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Sonnet 4.5200K | o1200K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic6 benchmarks
Coding3 benchmarks
Reasoning3 benchmarks
KnowledgeClaude Sonnet 4.5 wins8 benchmarks
| Benchmark | Claude Sonnet 4.5 | o1 | Result |
|---|---|---|---|
| GPQASource | 83.4% | 75.7% | Claude Sonnet 4.5 leads |
| MMLUSource | — | 91.8% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 23.4% | Not comparable |
| AA-GPQA DiamondSource | — | 74.7% | Not comparable |
| AA-HLESource | — | 7.7% | Not comparable |
| AA-Omniscience IndexSource | — | -10.5% | Not comparable |
| AA-Omniscience AccuracySource | — | 34.7% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 69.3% | Not comparable |
MathClaude Sonnet 4.5 wins3 benchmarks
Multimodal1 benchmarks
| Benchmark | Claude Sonnet 4.5 | o1 | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1219 | — | Not comparable |
Frequently Asked Questions (3)
Which is better, Claude Sonnet 4.5 or o1?
Claude Sonnet 4.5 is ahead on BenchLM's BenchAlign leaderboard, 52.89 to 47.14. The biggest single separator in this matchup is GPQA, where the scores are 83.4% and 75.7%.
Which is better for knowledge tasks, Claude Sonnet 4.5 or o1?
Claude Sonnet 4.5 has the edge for knowledge tasks in this comparison, averaging 83.4 versus 75.7. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Which is better for math, Claude Sonnet 4.5 or o1?
Claude Sonnet 4.5 has the edge for math in this comparison, averaging 11.2 versus 9.3. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.