New model released: Claude Opus 5

On July 24, 2026, Anthropic introduced Claude Opus 5, the new generation of its Opus model line. The company describes it as a thoughtful, proactive model that comes close to the frontier intelligence of Claude Fable 5, at half the price.

The key facts

• Availability and pricing: Claude Opus 5 is available today on all platforms, at the same price as its predecessor Opus 4.8: $5 per million input tokens and $25 per million output tokens. It's the new default model on Claude Max and the strongest available model on Claude Pro.
• Top scores on coding and knowledge work: On Frontier-Bench and GDPval-AA, Opus 5 is the new state of the art according to Anthropic, though it remains behind Mythos 5 on cybersecurity tasks.
• Efficiency: On Frontier-Bench v0.1, Opus 5 surpasses all other models and more than doubles Opus 4.8's performance at a lower cost per task. On CursorBench 3.2, at max effort, it performs within 0.5% of Fable 5's peak score, but at half the cost per task.
• Science: Opus 5 improves over Opus 4.8 on every internal life sciences evaluation, with the biggest gains in organic chemistry (10.2 percentage points higher) and protein-related tasks (7.7 percentage points higher).

Performance and cost-efficiency compared

In its announcement, Anthropic shows several charts positioning Opus 5 relative to compute effort and cost against previous models. On Zapier's AutomationBench, which tests whether models can complete business tasks fully from start to finish, Opus 5's pass rate is around 1.5 times that of the next-best model, at the same cost per task. On OSWorld 2.0, a computer-use benchmark, Opus 5 outperforms every other model at any given cost level, matching Fable 5's best result at just over a third of the cost.

Where the limits are: cybersecurity

Anthropic explicitly states that Opus 5 does not advance the frontier on risky, dual-use capabilities. On cybersecurity tasks, the model approaches Mythos 5 at finding vulnerabilities, but remains substantially behind when it comes to turning those vulnerabilities into usable exploits.

Opus 5's safety classifiers allow the model to find vulnerabilities in source code, but block so-called binary-based scanning, penetration testing, and exploit generation. According to Anthropic's own figures, these classifiers intervene around 85% less often than they do for Fable 5.

Availability

Claude Opus 5 is available today on all platforms, including the Claude API under the model identifier claude-opus-5. It is also offered in a faster Fast mode, running around 2.5 times the default speed, at twice the base price.