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Morning Edition · Thursday, September 10, 2026Published at 2:24 AM EDT · New York
Anthropic's Fable 5.1 Doubles Its Own Science Terminal Score, and Its Unrestricted Twin Beats It on Coding
Mythos 5.1, the same model with looser cyber and biology safeguards, scores 60.9 percent on Terminal-Bench 4.0 against 55.8 percent for the publicly available Fable 5.1.
Anthropic released Claude Fable 5.1 and Claude Mythos 5.1 at the start of September, three months after Fable 5. On Terminal-Bench-Science 0.1, Fable 5.1 scores 52.6 percent against 24.7 percent for Fable 5, 29.0 percent for Opus 5 and 22.4…
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Part of a tracked trend
Frontier Labs Race on AI Coding Capability
Coding is becoming a primary competitive battleground among frontier labs, with incumbents standing up permanent coding teams and investing in new training stages (e.g. midtraining) to match leaders like Anthropic; expect recurring reorganizations, benchmarks, and model releases aimed specifically at code.
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