Published 31 July 2026 · Updated 19 October 2026
Anthropic just released Claude Opus 5, a new flagship model that competes directly with Fable 5 but costs a fraction of the price. Available across Claude apps, Claude Code, and the API, Opus 5 is billed as a thoughtful and proactive system that keeps Anthropic competitive in the top tier of large language models.
Anthropic’s published benchmarks put Opus 5 at the front of several categories. On agentic terminal coding, knowledge work, agentic search, and computer use, it outperforms both Fable 5 and GPT-5.6 Sol. Its ARC-AGI-3 score of 30.2 percent, reportedly verified by ARC Prize, is roughly three times the previous best. Composite rankings are more mixed: on some independent indexes it still sits behind Fable 5 and GPT-5.6.
On mathematical reasoning, the model showed perfect performance in testing against International Math Olympiad 2026 problems, scoring 42 out of 42. The previous gold threshold was 29 points.
For teams evaluating AI safety, Opus 5 also adds alignment improvements. Reviews of Anthropic’s system card suggest Opus 5 is strong at finding software vulnerabilities but is not Mythos-class at chaining them into working exploits. This boundary matters for security teams deciding which tool to trust near production code.
Price remains central to the launch. Opus 5 keeps the same rate structure as Opus 4.8: 5 dollars and 25 dollars per million tokens for input and output. That puts powerful frontier-class intelligence within reach for teams that cannot justify Fable-level pricing.
For Australian developers and businesses following the AI race, the move signals that Anthropic is no longer content with Opus sitting one tier ahead through Sonnet. Now the company is pushing down from above, using the same model family that previously competed only at the top of the market to challenge the current benchmark leaders at half the cost.
Sources
- MarkTechPost, Meet the new Claude Opus 5: frontier-class agentic coding and computer use at unchanged Opus pricing. 24 July 2026
- Vellum, Claude Opus 5 benchmarks explained
- Zvi Mowshowitz, Claude Opus 5: the system card. Review of Anthropic’s system card
- Anthropic, Claude pricing
Benchmark figures are largely vendor-reported and had not been independently replicated at the time of writing.
Related Reading
- Anthropic Accuses Alibaba of the Largest Known Attack on Claude AI
- Claude Design 2.0 is here. Here is why it changes everything.
- Anthropic’s AI Agents Wage a Turf War in a Shared Server Test
The views expressed on this site are my own and do not represent those of any current or former employer. Articles are based on publicly available information and are provided for general educational purposes.
How this analysis is researched, sourced and corrected: Editorial standards and corrections. Spotted an error? Contact Philip Hall.
