Model comparison
Claude Sonnet 4.5 vs Sonar
Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 37.8 on the Noometry Index. Sonar costs 6.0× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
PerplexitySummary
- The widest gap is in writing & preference, where Claude Sonnet 4.5 leads 66.7 to 52.6.
- Sonar is cheaper at $1 / $1 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
- Claude Sonnet 4.5 accepts more context: 1M tokens versus 128K.
Side by side
| Claude Sonnet 4.5 | Sonar | |
|---|---|---|
| Provider | Anthropic | Perplexity |
| Noometry Index | 44.0 | 37.8 |
| Released | 2025-09-29 | 2024-01-01 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 128K |
| Max output | 64K | 4K |
| Input $ / M tokens | $3 | $1 |
| Output $ / M tokens | $15 | $1 |
| Results tracked | 73 | 7 |
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Category by category
Coding Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 47.8 (#54), Sonar: 35.1 (#217)
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1489 | — |
| ALE-Bench | 796.15 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.5: 38.1 (#30), Sonar: —
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| LMArena Search | 1159 | — |
| METR Time Horizons | 67.4% | — |
| Vending-Bench 2 | 3,839 | — |
Reasoning Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 26.9 (#113), Sonar: 20.3 (#221)
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | 37.3% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1462 | — |
| Mystery Game Puzzles | 17% | — |
| DTBench | 83.2% | — |
| LiveBench Data Analysis | — | 37.9% |
| LMCA | 38.8% | — |
| Epoch Capabilities Index | 146.84 | — |
| ForecastBench | 61.9 | — |
| LiveBench | — | 46.9% |
Math Too close to call
Claude Sonnet 4.5: 31.9 (#190), Sonar: 31.3 (#197)
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 77.8% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| LiveBench Math | — | 41.6% |
| LMArena Math | 1448 | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
Claude Sonnet 4.5: 48.4 (#70), Sonar: —
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| GPQA Diamond | 82.3% | — |
| Humanity's Last Exam | 13.7% | — |
| SimpleQA Verified | 30.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
| LMArena Expert | 1483 | — |
Multimodal Not comparable
Claude Sonnet 4.5: 34.1 (#84), Sonar: —
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |
Multilingual Not comparable
Claude Sonnet 4.5: 53.6 (#65), Sonar: —
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| LMArena Non-English | 1425 | — |
| LMArena Chinese | 1459 | — |
| LMArena French | 1459 | — |
| LMArena German | 1427 | — |
| LMArena Japanese | 1390 | — |
| LMArena Korean | 1403 | — |
| LMArena Russian | 1436 | — |
| LMArena Spanish | 1457 | — |
Instruction Following Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 75.2 (#74), Sonar: 71.5 (#146)
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| IFEval | 85% | — |
| LMArena Instruction Following | 1459 | — |
Long Context Not comparable
Claude Sonnet 4.5: 45.2 (#45), Sonar: —
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| LMArena Longer Query | 1476 | — |
Writing & Preference Claude Sonnet 4.5 leads
Claude Sonnet 4.5: 66.7 (#33), Sonar: 52.6 (#166)
| Benchmark | Claude Sonnet 4.5 | Sonar |
|---|---|---|
| LMArena Text | 1439 | — |
| LMArena Creative Writing | 1442 | — |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
| LMArena Multi-Turn | 1465 | — |
| LiveBench Language | — | 44.1% |
Frequently asked questions
Is Claude Sonnet 4.5 better than Sonar?
Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 37.8 on the Noometry Index. Sonar costs 6.0× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.
Which is cheaper, Claude Sonnet 4.5 or Sonar?
Sonar is cheaper. It lists at $1 per million input tokens and $1 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.
Is Claude Sonnet 4.5 or Sonar better for coding?
Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 35.1 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 4.5 does, with 1M tokens against 128K.
How many benchmarks do Claude Sonnet 4.5 and Sonar share?
0 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Sonar has 7.