Anthropic: claude-opus-4-5:free
Claude 4.5 Opus is Anthropic’s most capable model to date. It excels at tackling high-complexity tasks such as frontier scientific research, intricate software architecture design, and deep strategic analysis. Compared to its predecessors, it offers significantly improved reasoning coherence and a substantial reduction in hallucinations. The Opus variant is specifically enhanced for cross-modal synthesis, enabling it to correlate details across thousands of pages of documents, massive codebases, and high-definition video streams simultaneously. It also features more granular "Constitutional AI" guardrails, ensuring the model remains helpful, harmless, and aligned with human values.
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Performance
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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 |
| verbosity | Some providers | - |