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Claude Fable 5 is Anthropic's most capable coding-focused model, built for long-running, ambiguous, asynchronous work such as legacy migrations and gnarly production bugs that can span hours or days. It self-corrects through verification loops and is state of the art on nearly all tested coding benchmarks, with a 1M-token context window.
Kimi K3 is Moonshot AI's July 2026 flagship model, a 2.8-trillion-parameter mixture-of-experts model with native multimodal vision and a 1M-token context window. It is built for long-horizon coding, reasoning, and agent workflows, positioned as an open-weight competitor to top proprietary frontier models.
Benchmarks
Head-to-head scores across reasoning, coding, and agentic indices, plus per-domain rankings.
Intelligence
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
