Anthropic: claude-opus-4.1:free
Claude Opus 4.1 is a targeted performance upgrade to Anthropic's flagship Opus 4 series. Serving as a drop-in replacement, it maintains the same API footprint and pricing while delivering substantial gains in real-world software engineering and long-horizon agentic workflows. Scoring 74.5% on SWE-bench Verified, it outperforms the original Opus 4 by providing superior multi-file refactoring and pinpoint error-tracking capabilities. It features a "hybrid reasoning" architecture that allows developers to toggle between near-instant responses and deep "Extended Thinking" modes. This makes it an industry leader for autonomous coding agents, enterprise-level knowledge assistants, and complex research-level synthesis.
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Supported parameters
All providers = every upstream serving this model supports it. Some providers = depends on which upstream handles the request. Default = the value sent when you leave the parameter unset.
| Parameter | Providers | Default |
|---|---|---|
| frequency_penalty | Some providers | Not sent by default |
| include_reasoning | All providers | - |
| max_completion_tokens | Some providers | - |
| max_tokens | All providers | - |
| presence_penalty | Some providers | Not sent by default |
| reasoning | All providers | - |
| repetition_penalty | Some providers | Not sent by default |
| response_format | Some providers | - |
| stop | Some providers | - |
| structured_outputs | Some providers | - |
| temperature | All providers | Not sent by default |
| tool_choice | All providers | - |
| tools | All providers | - |
| top_k | Some providers | Not sent by default |
| top_p | Some providers | Not sent by default |
