Anthropic: claude-opus-4.6:free
Released on February 5, 2026, Claude Opus 4.6 is Anthropic's frontier model optimized for complex enterprise workflows and high-stakes knowledge work. As a direct successor to Opus 4.5, it introduces a massive 1 million token context window. It is designed to act as an autonomous agent that "nails deliverables on the first try," significantly reducing the need for iterative prompting. Opus 4.6 excels in "Computer Use," long-horizon coding (reigning atop Terminal-Bench 2.0), and professional-grade cybersecurity analysis.
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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 |
|---|---|---|
| include_reasoning | All providers | - |
| max_completion_tokens | Some providers | - |
| max_tokens | All providers | - |
| reasoning | All providers | - |
| reasoning_effort | All providers | - |
| response_format | All providers | - |
| stop | All providers | - |
| structured_outputs | All providers | - |
| temperature | All providers | - |
| tool_choice | All providers | - |
| tools | All providers | - |
| top_k | Some providers | - |
| top_p | All providers | - |
| verbosity | All providers | - |