Wednesday 2 September 2026
Top stories today:
Claude Fable 5.1 debuts as Anthropic’s most advanced model
Google’s Gemini 3.8 Flash to release as soon as Wed.
OpenAI’s Astra to release “soon” as answer to Anthropic’s Mythos
Apple to pay John Ternus ~$58M in FY2027, Tim Cook ~$47M
World Labs, Fei-Fei Li’s AI startup, unveils Atlas world model
0. Data & Calendar
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All times are ET.
Listen to our AI-generated podcast summarizing today’s newsletter (beware of hallucinations):
1. Claude Fable 5.1 debuts as Anthropic’s most advanced generally available model
Fable 5.1 scored 66 on the Artificial Analysis Intelligence Index, surpassing Opus 5 and Fable 5:
Costs $10/$50 per 1M input/output tokens, unchanged from Fable 5, vs. GPT-5.6 Sol at $8/$30, Grok 4.6 at $2/$6 and Kimi K3 at $3/$15.
Cached-read pricing -75% to $0.25/1M tokens.
Estimated costs are 25% lower than Fable 5 for typical workloads and up to 45% lower for highly agentic work, Anthropic said.
Mythos 5.1 debuted alongside Fable 5.1 for trusted partners, with cybersecurity and life sciences safeguards.
Text-output watermarking is on by default for both Fable 5.1 and Mythos 5.1.
A detection API is available to eligible groups as required under EU law.
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3. Google’s Gemini 3.8 Flash said to release as soon as Wed., Gemini 4 advances
Codenamed “Skimaki,” Gemini 3.8 Flash reportedly beat Anthropic’s Opus in Google’s internal coding tests.
Google is months behind schedule on a new Pro-series model.
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5. OpenAI plans Astra release “soon” as answer to Anthropic’s Mythos
Astra outperformed GPT-5.6 Sol on OpenAI’s internal “ExploitBench” benchmark:
Astra’s advanced cyber capabilities will initially be limited to select partners in OpenAI’s Daybreak Blue program.
OpenAI previously paused some training workloads related to Astra and a future model for several weeks.
Astra reportedly uses “recurrent depth” to improve cost and performance while obscuring its reasoning.
Astra is OpenAI’s first model to reach its “Critical” cyber threshold, the company said.
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7. Apple to pay John Ternus ~$58M in FY2027, Tim Cook ~$47M as executive chair
Ternus will receive a $3M annual base salary, while Cook’s will be cut to $2M from $3M.
Tue.: Tim Cook handed the reins to Ternus after 15 years as Apple CEO.
