Claude Sonnet 4.5
by Anthropic
· Claude 4 family · released Sep 29, 2025
Closed
Active
Sonnet 4.5: frontier coding with 80 percent lower hallucinations.
Pricing
Launch price (from Sep 29, 2025)
$3.00 in / $15.00 out per 1M tokens
Current price (since Sep 29, 2025)
$3.00 in / $15.00 out per 1M tokens
| Tier | Effective | In $/M | Out $/M | Cache $/M | Per image | Per second | Source |
|---|---|---|---|---|---|---|---|
| Standard | Sep 29, 2025 – now | $3.00 | $15.00 | - | - | - | - |
| Batch | Sep 29, 2025 – now | $1.50 | $7.50 | - | - | - | - |
Specifications
| Model type | Multimodal |
|---|---|
| Architecture | Dense |
| Parameters | Not disclosed |
| Context window | 200K tokens |
| Max output | 64K tokens |
| Knowledge cutoff | Jul 1, 2025 |
| License | Proprietary |
| Modalities | Text input Image input Text output |
| Tags | Agentic Coding Flagship Tool use Vision |
| End of life | Not disclosed |
| Last verified | Aug 20, 2026 |
Benchmarks
| Benchmark | Score | Src |
|---|---|---|
| LMSYS Chatbot Arena Elo | 1,405 | - |
| SWE-bench Verified | 82% | official |