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.