Anthropic: Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Everything else
| Max output | 64K |
|---|---|
| Input / 1M | $3 |
| Output / 1M | $15 |
| Cache read / 1M | $0.3 |
| Cache write / 1M | $3.75 |
| 1M in + 1M out | $18 |
| Takes | text, image, file |
| Returns | text |
| Tools | yes |
| Reasoning | optional |
| Open weights | no |
| Released | 2025-09-29 |
| Knowledge cutoff | 2025-01-31 |
| Retires | — |
| Catalog id | anthropic/claude-sonnet-4.5 |
Benchmarks
| source | epoch |
|---|---|
| eci | 146.76 |
| confidence | Unknown |
| accessibility | API access |
Benchmark scores by Epoch AI, CC BY 4.0.
Using it
In 00, this model is picked per agent — and per tier, so the model that answers your customers need not be the one that writes your code. Get 00.