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Models

Frontier and open models: what shipped, what it can do, and how the claims hold up.

  • Claude Sonnet 5

    Balanced capability and cost; the default choice for most production workloads.

  • Claude Haiku 4.5

    Fast and inexpensive, suited to high-volume classification and extraction.

  • Claude Opus 5

    Anthropic’s most capable model, aimed at complex reasoning and long-context work.

  • AlexNet wins ImageNet

    GPU training turns a dormant idea into an industry, cutting error rates dramatically overnight.

  • ResNet solves depth

    Residual connections let networks go far deeper without degrading.

  • Open-weight models close the reasoning gap

    A new open-weight release matches closed-model performance on multi-step reasoning benchmarks, narrowing a gap that had been widening for two years.