Claude 4.0 Opus

Claude 4.0 Opus represents Anthropic's flagship reasoning model, positioned as their most powerful offering at launch and engineered for sustained performance on long-running tasks that demand thousands of focused steps. According to Anthropic's own framing cited by early adopters, it leads coding benchmarks with a 72.5% score on SWE-bench and 43.2% on Terminal-bench, with Cursor calling it state-of-the-art for coding and Replit reporting improved precision across multi-file refactors. Rakuten's validation, where the model drove an open-source refactor independently for seven hours, illustrates the extended agentic workflows the architecture is designed to support, while Cognition highlights its ability to solve challenges that previous generations missed.

On Qiniu's platform, Claude 4.0 Opus is exposed through an OpenAI-compatible endpoint backed by a 200,000-token context window and a 32,000-token maximum output, making it well matched to codebase-scale reasoning, document analysis, and multi-step tool use. The Qiniu catalog confirms support for reasoning, tool calling, and temperature control, while structured output is not enabled for this listing. Practically, the model fits teams that need a frontier general-purpose assistant for coding agents, complex problem-solving, and extended analytical sessions where continuity over many turns matters more than raw single-prompt throughput.