Claude Sonnet 4.5 pricing & benchmarks
Released Sep 29, 2025 · served by 4 providers · ranked #43 by intelligence in our index
What Claude Sonnet 4.5 is
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...
- Model ID:
anthropic/claude-sonnet-4.5 - Modality: text+image+file->text
- Knowledge cutoff: 2025-01-31
- Tool calling: supported · Structured output: supported
Providers and prices for Claude Sonnet 4.5
The same model costs different amounts depending on who serves it. Prices are per 1M tokens, cheapest first. Uptime and throughput are OpenRouter's rolling measurements, not vendor claims.
| Provider | Input | Output | Context | Quant | Uptime 24h | Throughput |
|---|---|---|---|---|---|---|
| Azurecheapest | $3.00 | $15.00 | 200K | — | 99.3% | — |
| Anthropic | $3.00 | $15.00 | 1M | — | 84.3% | — |
| $3.30 | $16.50 | 1M | — | — | — | |
| Amazon Bedrock | $3.30 | $16.50 | 1M | — | 100.0% | — |
Claude Sonnet 4.5 benchmark results
Design Arena head-to-head results, as reported through the OpenRouter model API.
| Category | Arena | Rank | Elo | Win rate |
|---|---|---|---|---|
| asciiart | models | #11 | 1243 | 56.3% |
| mobileapps | agents | #13 | 1216 | 54.2% |
| fullstack | agents | #22 | 1101 | 43.5% |
| webapps | agents | #28 | 1126 | 44.8% |
| svg | models | #40 | 1165 | 52.3% |
| 3d | models | #42 | 1215 | 51.7% |
| codecategories | models | #42 | 1213 | 52.2% |
| gamedev | models | #42 | 1223 | 51.5% |
| uicomponent | models | #43 | 1211 | 50.3% |
| website | models | #44 | 1215 | 52.6% |
| dataviz | models | #51 | 1195 | 47.6% |
Cheaper models in the same class
Models scoring within 4 points of Claude Sonnet 4.5 on the Intelligence Index, but with a lower output price.
FAQ
How much does the Claude Sonnet 4.5 API cost?
$3.00 per 1M input tokens and $15.00 per 1M output tokens. A typical workload of 1M input + 300K output tokens costs about $7.50.
Is Claude Sonnet 4.5 free?
No. It is a paid model starting at $3.00 per 1M input tokens, though some providers offer trial credits.
Which provider is cheapest for Claude Sonnet 4.5?
Azure at $3.00 input / $15.00 output per 1M tokens.
Can I self-host Claude Sonnet 4.5?
No. Claude Sonnet 4.5 is closed-weight and only available through hosted APIs.