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The AI Daily Brief · Monday, July 27, 2026

Claude Opus 5 Excels in Benchmarks, Outperforming Fable 5 and GPT-5.5 on Key Metrics

Claude Opus 5 has shown strong performance on several AI benchmarks, including the Frontier Bench and OS World 2.0, where it scored significantly higher than Fable 5 and GPT-5.5 Soul. Anthropic's new model also demonstrated unique capabilities, such as creating its own pipeline to process an image for a 3D CAD task, a feat not achieved by other models.

companyAnthropiccompanyFablecompanyGPT-5.5companyMythos

The tape

3 quotes
On Frontier Bench, which is a more difficult version of terminal bench, which was about 10 points higher than Fable 5, and about 9 points higher than GPT56 Soul.
For compute use on OS World 2.0, Opus 5 came in over the top with a 70.6%, while Fable 5 scored 55.7% and GPT56 Soul scored 62.2%.
No other model, including Mythos, was able to complete this task.
Heard on The AI Daily Brief — “Where Claude Opus 5 Fits in Your Model Rotation, published Monday, July 27, 2026. Heardvine summarizes and quotes with attribution and timestamps, and links to the original everywhere.
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Claude Opus 5 Excels in Benchmarks, Outperforming Fable 5 and GPT-5.5 on Key Metrics — Heardvine