Claude Opus 5 has arrived, and Anthropic claims it can compete with Fable 5 in certain tasks.
Significant advancements in software engineering have brought Opus 5 closer to Anthropic’s leading model.
Anthropic has introduced Claude Opus 5, its newest AI model designed for coding, research, business tasks, and other intricate functions. The company claims it represents a substantial performance enhancement over Claude Opus 4.8, while maintaining the same API pricing. Furthermore, Anthropic asserts that it closely approaches Claude Fable 5 in certain coding and computer usage assessments, yet is significantly cheaper per task.
Opus 5 is accessible through all Claude applications and API. It is now the standard model for subscribers of Claude Max and the most robust option offered with Claude Pro.
How similar is Claude Opus 5 to Fable 5?
In the CursorBench 3.2 evaluation, which assesses coding agents on actual software development projects, Opus 5 finished within 0.5% of Fable 5’s highest score at maximum performance. Anthropic states this outcome was achieved at half the cost per task.
Opus 5 also surpassed Fable 5’s top result in the OSWorld 2.0 benchmark at just over one-third of the cost. This benchmark evaluates how effectively AI agents can control computers and execute tasks across various applications and files.
For Pro and standard Team subscribers, Opus 5 could bridge the gap following Fable 5's transition to a pay-as-you-go credit system on July 20.
How much improvement is seen over Opus 4.8?
Anthropic claims that Opus 5 more than doubled the score of Opus 4.8 on the Frontier-Bench, which assesses AI agents on challenging software engineering tasks, and achieved these tasks at a lower average cost.
The company highlights that Opus 5 is more proficient at reviewing its work, diagnosing bugs, and persisting through challenging assignments rather than stopping after a quick solution. In one instance, it identified an edge case overlooked by an existing community patch.
These findings are based on Anthropic's internal testing, so actual performance may vary with routine tasks. The pricing for Claude Opus 5 remains unchanged from Opus 4.8 at $5 per million input tokens and $25 per million output tokens.
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Claude Opus 5 has arrived, and Anthropic claims it can compete with Fable 5 in certain tasks.
Anthropic has unveiled Claude Opus 5, featuring significant enhancements in coding, while maintaining the same API pricing as Opus 4.8, and showing performance levels near those of Fable 5 in certain tests.
