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Two top models go head-to-head on today's AI news. Pick the sharper summary without seeing the names — the crowd's verdict builds the leaderboard.

Agents & InferenceHacker News

Gemini 4 Carbon is the new #1 on the Artificial Analysis Intelligence Index v5

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Mistral Large quota or rate limit — check usage and plan. Original headline: Gemini 4 Carbon is the new #1 on the Artificial Analysis Intelligence Index v5

What you'll learn · Oct 31, 2026 · 6 stories

  1. 1.Carbon tops the index at $7.76/task (23% under Claude Opus 5.5) but trails on coding agents, scoring 59 vs Opus 5.5's 62.
  2. 2.One engineer with unlimited token budget targeting 98% of the codebase signals how companies are betting on AI-driven legacy modernization over entry-level hiring.
  3. 3.Agents ship to production hourly with 30-second rollbacks, but the team treats any hour without a ship as a top-severity incident.
  4. 4.The agent uses Plaid-imported credit card data on food and drink transactions to personalize recommendations and books tables directly from group chats.
  5. 5.Context-weighted localized posteriors with normalizing flows reduced temperature and zonal-velocity errors versus deterministic and global-posterior calibration in a single-column ocean model.
  6. 6.Across seven agents on 50 formally-graded problems, closed-book success was rare; live-web wins mostly reflected retrieval of published solutions rather than genuine rediscovery.
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Agents & InferenceHacker News

Cisco gives engineer unlimited AI tokens to rewrite legacy code

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Summary A

Cisco has given a 27-year-old engineer unlimited AI tokens to rewrite its legacy code, resulting in an upgrade of 98% of its codebase. This demonstrates the potential for AI-assisted code rewriting to drastically modernize large legacy systems, which could significantly impact the cost and feasibility of similar efforts for other companies running LLMs and agents in production. This development enables companies to consider aggressive code modernization strategies using AI.

Agents & InferenceSimon Willison

Building a multiplayer game world with autonomous Fable-class models

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Fable-class models enabled autonomous development and deployment of a massively multiplayer game world, with agents shipping changes to production hourly and costing $3 million in tokens per month; this level of autonomy relies on the specific capabilities of models like Fable 5, and using less capable models like Opus 5.5 or overly cautious ones like GPT-6 Astra can break the system.

Agents & InferenceTechCrunch

Zest launches text-based AI concierge that books restaurants via OpenTable, Resy, SevenRooms

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Mistral Large quota or rate limit — check usage and plan. Original headline: Zest’s new AI agent finds restaurants and books reservations over text

Agents & InferencearXiv

Localized posterior inference cuts ocean turbulence calibration errors vs global methods

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Mistral Large quota or rate limit — check usage and plan. Original headline: Amortized Localized Posterior Inference for Model Calibration with Application to an Ocean Turbulence Closure

Agents & InferencearXiv

OpenFrontiers: A Collection of Open Research Problems and a Benchmark for Scientific Rediscovery

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Mistral Large quota or rate limit — check usage and plan. Original headline: OpenFrontiers: A Collection of Open Research Problems and a Benchmark for Scientific Rediscovery

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