Anthropic: Claude Opus 4.8
Chatanthropic/claude-opus-4.8Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family, released on 2026-05-28. It accepts text, image, and file inputs with text output, and suits highly autonomous agents, long-horizon agentic work, and memory-driven tasks where coherence over extended sessions matters. It is particularly strong on multi-step reasoning, complex coding, and end-to-end project orchestration, and also handles knowledge work such as drafting documents, building presentations, and analyzing data. Supports tool use and prompt caching. Context window: 1M tokens, output: 128K. 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-opus-4.8",max_tokens=1024,messages=[{"role": "user", "content": "Hello!"}],)print(message.content[0].text)
Uptime & Status
Benchmarks
Anthropic: Claude Opus 4.8 scores 1475 in the Overall category of the LMArena text leaderboard (style control), ranking #16 of 374 models based on 27,803 human preference votes (updated 2026-07-12).
| Category | Arena Score | 95% CI | Rank | Votes |
|---|---|---|---|---|
| Overall | 1470–1481 | #16 of 374 | 27,803 | |
| Hard Prompts | 1501–1514 | #8 of 374 | 18,352 | |
| Coding | 1525–1541 | #8 of 369 | 7,749 | |
| Math | 1462–1494 | #19 of 362 | 1,336 | |
| Creative Writing | 1452–1471 | #14 of 372 | 4,852 | |
| Instruction Following | 1471–1486 | #11 of 374 | 9,428 | |
| Chinese | 1512–1546 | #9 of 344 | 1,295 |
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.