{
  "id": 6634740,
  "title": "Cognition launches new SWE-2 model, Rivaling Fable 5.1 and GPT-Astra",
  "url": "https://urgent.news/2026/09/10/cognition-launches-new-swe-2-model-rivaling-fable-5-1-and-gpt-astra",
  "topic": "ai",
  "section": "AI",
  "published": "2026-09-10T15:29:47.000Z",
  "source": {
    "name": "Hacker News",
    "slug": "hacker-news",
    "url": "https://cognition.com/blog/swe-2"
  },
  "original_language": "en",
  "account": "Cognition has unveiled SWE-2, a groundbreaking coding model that matches the capabilities of Fable 5.1 and GPT-Astra while being significantly more cost-effective. This new model represents the pinnacle of scaling reinforcement learning to multi-trillion-parameter regimes, a milestone previously unattained.\n\nKey differentiators of SWE-2 include its ability to train all reasoning-effort levels concurrently, a leap forward in managing cost and performance. When benchmarked against FrontierCode 1.1 Main, SWE-2 delivers a 50.0% score, only 1 point shy of Fable 5.1's 51.0%, and does so at a 64% lower cost. The model's efficiency is further highlighted by its ability to make its first edit after only 18 steps on average, compared to 48 steps for its predecessor, SWE-1.7.\n\nSWE-2's superiority extends to complex tasks as well, where its planning capabilities and uncertainty management set it apart from GPT-5.6 Sol and Fable 5/5.1. Remarkably, SWE-2 achieves these high benchmarks at a mere quarter of the cost of GPT-6 Astra.\n\nPost-training enhancements, including Pareto-informed cost penalties in reinforcement learning, have been instrumental in shaping SWE-2's unique characteristics. These advancements allow for a more nuanced cost-performance tradeoff, aligning the model's intelligence with its economic efficiency. The result is a model that not only rivals industry heavyweights like Fable 5.1 and GPT-Astra but also does so at a fraction of their price, marking a significant leap in the coding AI landscape.",
  "summary": null,
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 2,
    "also_reported_by": [
      {
        "outlet": "Hacker News Best",
        "title": "Cognition launches new SWE-2 model, Rivaling Fable 5.1 and GPT-Astra",
        "url": "https://urgent.news/2026/09/10/cognition-launches-new-swe-2-model-rivaling-fable-5-1-and-gpt-astra-6643693",
        "published": "2026-09-10T15:29:47.000Z"
      }
    ]
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}