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Vibe Coding2026-07-24 · source-backed
A Show HN July 23 pitched task-adaptive routing over GLM-5.2, Kimi K2.7 and others, reporting parity with Claude Fable on its evaluated mix at roughly a third the inference cost. Commenters wanted the task mix and side-by-side outputs, not aggregates. Treat the numbers as unverified vendor benchmarks. The pattern is the part to track: routing as the cost lever now that open weights are close on quality.
Each link below shares sources, entities, or timing with this story.
Jack Clark's Import AI 464 (around July 6) led with something I've been turning over all week. Claude Fable autonomously wrote what Clark calls "the first genuine (and fastest) megakernel" submitted to the KernelBench-Mega leaderboard. An 18.71x speedup in hand-written CUDA on...
Anthropic mathematician Levent Alpöge posted July 19 that he and a collaborator, working with Fable 5, found a degree-7 counterexample in three variables to a conjecture open since 1939. Mathematicians had estimated any counterexample would need degree ~200. The HN thread hit...
Anthropic shipped Fable 5 on June 9. Willison spent ~5.5 hours stress-testing it: slow and expensive, but it handled everything he threw at it, including agentic coding. (Simon Willison) The tell that it's a real working model and not a benchmark queen: because it post-dated A...
On June 9, Anthropic released Claude Fable 5 and Mythos 5 across Claude.ai, Claude Code (CLI and web), and Cowork. The spec sheet: 1M-token context, 128K max output, a January 2026 knowledge cutoff, and pricing at $10 input / $50 output per million tokens. That's double Opus 4...
Moonshot AI released Kimi K3, a sparse mixture-of-experts activating 16 of 896 experts per token. That's about 1.8% of the pool live at any moment, with a 1M-token context window and native vision. Two new architectural pieces show up: Kimi Delta Attention and Attention Residu...
43.3% on Frontier-Bench v0.1. Opus 4.8 scored 18.7%. That's not an incremental bump, that's the same benchmark with a different shape of answer. Anthropic released Claude Opus 5 on July 24 at $5/$25 per million input/output tokens, exactly half of Fable 5's $10/$50, while matc...
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