Anthropic: Claude Sonnet 4.5
Chatanthropic/claude-sonnet-4.5Claude Sonnet 4.5 is Anthropic's balanced model, released on 2025-09-29, with state-of-the-art performance on SWE-bench Verified. It is well suited to coding, analysis, and general-purpose tasks with an excellent cost-performance ratio, and supports reasoning, vision, tool use, PDF input, and prompt caching. Context window: 1M tokens, output: 64K. Priced at $3/M input and $15/M output tokens. Documents and screenshots can be supplied directly, and cached input reads are billed at $0.3/M tokens. Available via OpenAI and Anthropic protocols.
Providers
/v1/chat/completions/v1/responsesCode Examples
import anthropicclient = anthropic.Anthropic(base_url="https://api.ofox.run/anthropic",api_key="YOUR_OFOX_API_KEY",)message = client.messages.create(model="anthropic/claude-sonnet-4.5",max_tokens=1024,messages=[{"role": "user", "content": "Hello!"}],)print(message.content[0].text)
Uptime & Status
Benchmarks
Anthropic: Claude Sonnet 4.5 scores 1455 in the Overall category of the LMArena text leaderboard (style control), ranking #47 of 374 models based on 80,800 human preference votes (updated 2026-07-12).
| Category | Arena Score | 95% CI | Rank | Votes |
|---|---|---|---|---|
| Overall | 1452–1458 | #47 of 374 | 80,800 | |
| Hard Prompts | 1480–1487 | #37 of 374 | 46,503 | |
| Coding | 1508–1518 | #28 of 369 | 19,133 | |
| Math | 1419–1437 | #77 of 362 | 4,906 | |
| Creative Writing | 1448–1460 | #21 of 372 | 12,028 | |
| Instruction Following | 1459–1468 | #24 of 374 | 23,280 | |
| Chinese | 1470–1491 | #64 of 344 | 3,867 |
Source: LMArena · CC BY 4.0 · Updated 2026-07-12 · Methodology ↗ · Ranks compare models within each category of the LMArena text leaderboard (style control). Scores come from third-party human preference evaluations, not from OFOX.