Nova got Opus 4.8 to edge past Fable 5 on Terminal-Bench 2.1.
Modal Sandboxes let the team decouple Nova’s agent loop and automatic review from tool execution, with fast startup and changes deployed in seconds to keep iteration quick.
The result: 83.9%, up five percentage points from Opus 4.8’s Claude Code baseline and just ahead of Fable 5’s 83.8%.
We made Opus 4.8 perform like Fable 5. Same model. No fine-tuning. Terminal-Bench 2.1: Opus 4.8 in Claude Code: 78.9% Opus 4.8 in Nova Agent OS: 83.9% Fable 5: 83.8% Built together with our friends at @modal. The frontier isn't only the model anymore. https://novaagentos.ai/news/how-nova-beat-fable-5-with-opus-4-8View quoted post on X
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Original title: Nova got Opus 4.8 to edge past Fable 5 on Terminal-Bench 2.1.
