Xentir Claude Sonnet 5 vs Grok 4.5
Claude Sonnet 5 · Anthropic, released 2026-06-30
Grok 4.5 · xAI, released 2026-07-08
“Epoch AI, 'AI Benchmarking Hub'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource].” · epoch.ai/benchmarks · Licensed CC BY 4.0 · data last verified 2026-09-09 · Methodology · Data Sources
Grok 4.5 leads on more of the 5 benchmarks where both are measured — Claude Sonnet 5 on 1, Grok 4.5 on 4. The remaining 4 of 9 tracked benchmarks cannot be compared: 0 have a result for only one of the two models, 4 for neither. Nothing on this page is estimated to fill those in.
Head-to-head
Measured on 5 of 9 tracked benchmarks for both models — Claude Sonnet 5 leads on 1, Grok 4.5 leads on 4.
| Benchmark | Claude Sonnet 5 | Grok 4.5 | Leads |
|---|---|---|---|
| Epoch Capabilities Index (ECI) | 156.2 | 153.9 | Claude Sonnet 5 |
| SWE-bench Verified | Not measured | Not measured | Not measured on both |
| GPQA Diamond | 0.905 (xhigh) | 0.934 (high) | Grok 4.5 |
| MATH Level 5 | Not measured | Not measured | Not measured on both |
| OTIS Mock AIME 2024-2025 | 0.947 (xhigh) | 0.978 (high) | Grok 4.5 |
| FrontierMath | Not measured | Not measured | Not measured on both |
| FrontierMath Tier 4 | Not measured | Not measured | Not measured on both |
| SimpleQA Verified | 0.337 (max) | 0.483 (high) | Grok 4.5 |
| Chess Puzzles | 0.350 (xhigh) | 0.360 (high) | Grok 4.5 |
What remains uncertain
- 4 tracked benchmarks have no published result for either model.
A missing result means Xentir has not found one published by the source it cites, not that the model performs badly. See Data Sources.
Reference price
| Per 1M tokens | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| Output | $10.00 stale | — |
List price as published by the vendor. Xentir does not verify negotiated or enterprise rates, and price is not a measure of capability — see Data Sources.
Full profiles
Claude Sonnet 5 → · Grok 4.5 → · the full AI Model Rankings table