claude-opus-4-1 · Anthropic
Opus 4.1 is an upgraded version of Claude Opus 4, with improvements mainly in agent tasks, practical coding, and reasoning. Compared to Opus 4, there is a slight improvement in software engineering accuracy; Opus 4.1 has higher accuracy at 74.5%.
Opus 4.1 is an upgraded version of Claude Opus 4, with improvements mainly in agent tasks, practical coding, and reasoning. Compared to Opus 4, there is a slight improvement in software engineering accuracy; Opus 4.1 has higher accuracy at 74.5%.
Claude Opus 4.1 has a 200,000 token context window.
On AIHubMix, Claude Opus 4.1 costs $16.5 per million input tokens and $82.5 per million output tokens.
Claude Opus 4.1 accepts text and image input.
Claude Opus 4.1 supports thinking, tool calling, function calling and structured outputs. Per-protocol parameter support is listed in the capability table on this page.
Claude Opus 4.1 is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to claude-opus-4-1 — no other code changes needed.
Claude Opus 4.1 is developed by Anthropic. AIHubMix aggregates it alongside models from other providers behind one API and one bill.
Claude Opus 4.1 was released on August 5, 2025 by Anthropic.
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Use Claude Opus 4.1 via the AIHubMix unified API — one interface for every major LLM.