Developer Tools
Claude Formalized Fermat’s Last Theorem. A Small Fable 5.1 Test
Claude formalized Fermat’s Last Theorem in Lean. Understand what was checked, why the research model matters, and how to evaluate a small proof yourself.
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Developer Tools
Fable 5.1 Long-Running Agents: Tests, Recovery and Cost
SandBase's Fable 5.1 evaluation design: test a billing-client upgrade across two repositories, recover from tool failures, cap retries, and count accepted-task cost.
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Model Comparison
Fable 5.1 vs Mythos 5.1: Pricing, Limits and Access
SandBase compares Fable 5.1 and Mythos 5.1 access, API pricing, fallback and retention. Learn why a Fable API account does not grant Mythos research permissions.
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Industry Insights
Claude for Science: Venus Maps, Protein Design and GPUs
Examine Fable 5.1 and Mythos 5.1 research cases: Venus mapping, lab-tested protein binders, and GPU kernel speedups, with methods and evidence limits.
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Developer Tools
Can Cursor Still Use OpenAI? Alternatives and BYOK
Can Cursor still use OpenAI? Check GPT-6 Astra support, why an API key can work outside Cursor but fail inside it, BYOK limits, and replacement models.
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Agent Daily News
Claude Fable 5.1 Released: Revisiting the EAP Rumors
Claude Fable 5.1 launched on September 1. Revisit the EAP names, Claude Web routing rumors, and evidence that could not establish a model's identity.
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Developer Tools
AI Agent Stack 2026: Claude, OpenAI, Gemini, MCP, and the Runtime Layer
A practical map of the 2026 AI agent stack: model providers, tool protocols, Skills, orchestration, and runtimes, with a clear guide to where each layer belongs.
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Developer Tools
Claude's Production Agent Stack: Computer Use, Skills, and Files
Anthropic made Computer Use, Browser Use, Skills API, and Files API generally available. Here is how the pieces fit and where production risk remains.
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Developer Tools
Claude Tag: Anthropic Puts an AI Teammate in Your Slack
Claude Tag lets teams @mention Claude in Slack channels to delegate real work. Multiplayer, persistent memory, proactive, async. Available for Team and Enterprise.
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Tutorials
Anthropic Prompt Caching for Agents: Cut Claude Bill 60%
How to implement Anthropic prompt caching in agent loops. Real code, cost math, and advanced patterns that cut Claude API bills by 60% for repetitive workflows.
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