{
  "id": 9531293,
  "title": "Claude Opus 5.5 Beats Fable 5.1 at Much Lower Cost and Faster Speed",
  "url": "https://urgent.news/2026/09/24/claude-opus-5-5-beats-fable-5-1-at-much-lower-cost-and-faster-speed",
  "topic": "ai",
  "section": "AI",
  "published": "2026-09-24T08:53:59.000Z",
  "source": {
    "name": "ProPakistani",
    "slug": "propakistani",
    "url": "https://propakistani.pk/2026/09/24/claude-opus-5-5-beats-fable-5-1-at-much-lower-cost-and-faster-speed/"
  },
  "original_language": "en",
  "account": "Anthropic has unveiled Claude Opus 5.5, its most recent flagship AI model, boasting significant enhancements in performance, safety, efficiency, pricing, and communication over the previous version, Claude Opus 5. The new model surpasses Claude Fable 5.1 in most benchmarks while being considerably less expensive and faster. Claude Opus 5.5 is Anthropic's strongest-performing model to date on their automated behavioral audit. External evaluators, such as Frontier Design and METR, also tested the model before its release. Performance Boosts Claude Opus 5.5 signifies a substantial leap in performance over Opus 5, designed to tackle more intricate tasks. Early testers have reported remarkable improvements on challenging workloads. For instance, Opus 5.5 managed to complete a 680,000-line code migration in under a day, a task that would have taken a typical engineering team weeks. The model also excels in identifying and rectifying software inefficiencies. Anthropic had Opus 5.5 reduce loading times across all pages of a web application, succeeding in 39 out of 40 attempts. In comparison, Opus 5 achieved smaller improvements in the same test while altering the application's behavior. Game development is another area where Opus 5.5 shines. In a test where several Claude models were tasked with creating a game from a single prompt, Opus 5.5 achieved the highest score for graphics quality and overall polish. Pricing and Speed Opus 5.5 is more cost-effective to operate than Opus 5, enabling Anthropic to decrease its pricing. Early tests indicate that Opus 5.5 costs approximately 40% less than Opus 5 on typical workloads using default settings. The new model charges $4 per million input tokens and $20 per million output tokens, marking a 20% reduction compared to Opus 5. Cache reads are notably cheaper, priced at $0.20 per million tokens, which is 60% lower than Opus 5. Cache reads contribute to the majority of costs for agentic and coding workloads. Opus 5.5 also produces output over 30% faster than Opus 5. Enhanced Safety and Attack Resistance Safety is another key area of improvement in Opus 5.5. Anthropic claims the model achieved the best scores yet in their automated behavioral audit, which evaluates Claude across thousands of simulated scenarios. Opus 5.5 is less likely to carry out irreversible actions or operate beyond its boundaries compared to recent models. It is also more resistant to prompt injection attacks than Opus 5. Anthropic has broadened alignment testing for the new model to encompass longer tasks, impossible tasks, and real-world incident scenarios. The company notes that while these safeguards have limitations, further details on the Opus 5.5 System Card. Safeguards for Biology and Cybersecurity Anthropic asserts that Opus 5.5 has biological and cybersecurity capabilities comparable to Claude Mythos 5.1. Consequently, they are deploying the model with safeguards akin to those used for Claude Fable 5.1. Vetted organizations can apply for Anthropic's Life Sciences Verification Program to utilize Opus 5.5 for biology research. Anthropic also intends to expand access through its Cyber Verification Program in the coming weeks, allowing verified cybersecurity professionals to leverage the model for cybersecurity work. Future Models Sonnet 5.5 and Haiku 5.5 are set to be launched in the coming weeks. Anthropic anticipates these models to bring many of the same upgrades introduced with Opus 5.5, including improvements in performance, efficiency, and safety.",
  "summary": "Anthropic has introduced Claude Opus 5.5, its latest flagship AI model, with major improvements in performance, safety, efficiency, pricing, and … Read More The post Claude Opus 5.5 Beats Fable 5.1 at Much Lower Cost and Faster Speed appeared first on ProPakistani .",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "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."
}