Anthropic's New Claude Opus 5 Nearly Matches Flagship Fable 5 at Half the Cost

Anthropic today introduced Claude Opus 5, an upgrade to Opus 4.8. Anthropic says Opus 5 was built for daily use, and it offers near Fable 5 performance at half the price. Fable 5 is Anthropic's most capable publicly available model.

Opus 5 scores higher than Opus 4.8 on multiple benchmarked tasks, including agentic coding, novel problem solving, knowledge work, computer use, and multidisciplinary reasoning. It is a "meaningful improvement" over Opus 4.8 for scientific research, and it can produce better visual outputs.

Anthropic says the new model "provides greatly improved performance for the same cost" as Opus 4.8. Opus 5 is better at verifying its work and iterating until it completes a task. It is close to Mythos 5 at finding cybersecurity vulnerabilities, but it was not trained on cyber tasks and it remains "substantially behind" Mythos 5 on exploitation. Mythos 5 is Fable 5 with some safeguards removed. It is limited to a small number of organizations, mostly cyberdefenders and infrastructure providers because of its capability at finding and exploiting vulnerabilities.

Opus 5 is available on all platforms. It is the new default model on Claude Max and the strongest model available on Claude Pro. It is priced at $5 per million input tokens and $25 per million output tokens, which is the same as Opus 4.8. Fast mode is also available, running at 2.5x the default speed for twice the base price.