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Models2026-08-08 · source-backed
Moonlight & Mayhem, published August 7, handed Codex Desktop on GPT-5.6 Sol Ultra the identical raccoon-heist premise he'd given Claude Fable 5. Sol Ultra produced a full team-of-thieves heist structure versus Fable's single raccoon collecting coins, though it needed manual debugging. The measured cost for aggressive sub-agent use: 52 minutes, $23.28 at full API rates, 700.7K input tokens plus 32.5M cached and 148K output. Willison still qualifies it, calling Sol "definitely very competent" but not better than Fable on the hardest complex-coding tasks.
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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...
Simon Willison released 1.0a33 on June 11, extending the ?_extra= JSON API to queries and rows. The build method is the interesting part: he planned with Claude Fable 5 in Claude Code and implemented with GPT-5.5 xhigh in Codex Desktop. One feature, two models, planning split...
The Ramp/EconLab AI Index for August shows Anthropic's flagship capturing 6% of tokens purchased and 11.4% of dollars spent across Anthropic models, at roughly $10 per 1M tokens, about 2x GPT-5.6 Sol. Sol is 25% of OpenAI tokens and 23% of spend, generating roughly 33% more mo...
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...
Willison quoted Florian Herrengt on August 12 about teams accumulating so many AI-generated layers that nobody retains a working model of the system. The artifact still works, the org loses the mid-level engineers who could reason about why. Hold that against the OpenAI paper...
Anthropic's status page logged elevated errors from 04:50 UTC to 07:36 UTC covering Mythos 5, Fable 5 and Opus 5, resolved at 08:30 UTC, with Opus 5 and Fable 5 stabilizing first. (r/ClaudeAI) The recurring complaint in that thread is that failed requests still consume the fiv...
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