What reasoning means here
Reasoning is a broad label for working through a problem rather than producing an immediate response. It is assessed through tasks, not established by a model sounding thoughtful.
Training and evaluation
Training can encourage models to work through steps and use feedback. Evaluations test whether the final result is correct, useful and robust across different settings.
A careful reading of benchmarks
Read what the test measures, how it was run and what it leaves out. A score on one benchmark does not tell you how a model will perform on every task.
Key takeaways
Look at outcomes, not just the explanation. Reasoning performance depends on the problem, available tools, context and evaluation method.