Opus-4.6-Reasoning-2160x

2,160 high-quality reasoning traces generated by Claude Opus 4.6 via OpenRouter, covering mathematics, competitive programming, logic, science, and language tasks. Each example includes the full problem, an extended chain-of-thought, and a final solution — making the dataset suitable for supervised fine-tuning, chain-of-thought distillation, and reasoning-capability transfer to smaller models.

Originally generated as a batch of 3,305 examples; 1,145 were removed during quality filtering (refusals, empty responses, truncated problems). The 2,160 remaining examples are all substantive, complete reasoning demonstrations.