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Cover image for the 04 October 2026 Signal: Out goes Claude 4.6, in come Opus and Sonnet 5.5: Google's Antigravity reshuffles its model lineup for paid users.
THE SIGNAL · 04 OCT 2026 · 9 MIN READ

Google's Antigravity adds Claude 5.5 and drops Claude 4.6 for paid users

Google's Antigravity now gives paid AI Pro and Ultra users Claude Opus 5.5 and Sonnet 5.5. Small local models and cheaper cached prompts also give builders new levers on agent spend.

AI MODELSAGENT COSTSDRONES
37 of 41 figures cited15 receipts in the register
  1. 2B1Venturebeat
  2. 90%2OpenAI: cut agent costs with cached input reads
  3. 120b3explainx.ai
The register
Lead Story

The day's defining move.

Enterprise · explainx.ai
Lead storyEnterprise 120b3 explainx.ai · 03 OCT 2026
Enterprise·explainx.ai·03 OCT 2026

Antigravity Adds Claude 5.5, Drops Claude 4.6

Google's Antigravity now offers Claude Opus 5.5 and Sonnet 5.5 to paid Google AI Pro and Ultra users. Claude 4.6 and GPT-OSS-120b3 are removed on November 2, 2026.

Why it mattersAntigravity users with workflows pinned to retiring models, including GPT-OSS-120b3, must migrate before November 2, 2026, and should rerun coding evals on Sonnet 5.5 first.

Continue reading
World

Reuters reports that Ukraine plans to hit Russian oil refineries in response to Moscow's new airstrike doctrine, while Kyiv also tries to close a $27 billion4 defense budget gap.

Markets

Market sentiment reads Greed, a sign that risk appetite currently outweighs caution among investors.

Wild Card

Small and open runs through the AI news: Strands Labs' 2-billion-parameter Decider, PewDiePie's 9B5 Ajax built on Qwen 3.5, and Ant Group's Ling-3.1-flash with 25B6 active parameters all ship as open or locally run models.

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Listen & Watch

Daily broadcasts.

Podcast · Infographic
Visual

Intelligence map

Markets

6 levels at the close.

Market TerminalLAST CLOSE 02 OCT 2026 · READ 2026-10-04 · Yahoo Finance
S&P 500 7,722.729 +0.73%9 6D, window short 7,651.54 low / 7,743.41 high
Nasdaq 27,190.8610 +1.19%10 6D, window short 26,797.54 low / 27,190.86 high
Bitcoin $84,803.7011 +0.36%11 6D, window short $83,502.61 low / $84,853.10 high
Ethereum $2,686.8112 +0.70%12 6D, window short $2,668.15 low / $2,705.54 high
Crude Oil (WTI) $91.1113 -1.90%13 6D, window short $89.38 low / $92.87 high
Crypto Fear & Greed 65 / 10014 Greed 0 to 100 index 25 fear / 50 neutral / 75 greed · alternative.me
Today's Focus

What else the day turns on.

01

Apple's J450 Records No Video

Apple is reportedly developing an AI security camera, codenamed J450, that records no video and gives users text descriptions of activity in and around the home, according to Bloomberg's Mark Gurman on his Power On podcast. The device reportedly relies on a low-frame-rate sensor.

02

Tavus Claims Griffin Fooled 48%7

Tavus released Griffin, which it calls its first Human Interaction Model; it reads a speaker's expressions, tone, gestures and timing in real time to hold face-to-face conversations. Tavus claims Griffin fooled 48%7 of people who talked to it into believing it was a real person, and its demo passed 5 million views.

Source: archive.superhuman.ai
The Lab

Tool of the day, researched.

All Lab reports
OpenAI API home page, captured for the 4 October 2026 Lab report Tool of the day 7.215/ 10
AI Platform Pricing not published

OpenAI API

OpenAI now discounts the tokens your agent resends on every call, which turns prompt order into a line item on your bill.

Roughly 90%2 off cached input reads makes OpenAI's API a real cost lever for long-running agents, provided each request opens with a large, stable section. The catch is that savings only appear on the invoice, and community posts argue the headline input price hides the real blend. High-volume agent teams should restructure now; teams sending one-off prompts will see little change.

Capability 8.0
Ease 7.0
Value not scored
Momentum 6.0

Reviewers call the models fast and reliable, with solid APIs and documentation that make getting started simple.Paraphrased · Product Hunt

Also on the radar
Build

Chatzy AI: no-code agents for web, WhatsApp, and SMS

Chatzy AI is a conversational engagement platform for building, training, and deploying no-code AI agents across a website, WhatsApp, SMS, and other channels. Start by training one agent on your most common customer questions and deploying it on a single channel. Compare its answers against your support logs before you expand to other channels.

Try it
Build

Unified.to Agent Skills: drop-in SaaS integrations for coding agents

Unified.to published more than 100 SKILL.md integration instructions that tell coding agents how to connect to SaaS tools. It also added a typed GenAI Task object for tracking cloud-agent jobs and centrally managed authorization controls. Point your agent at the skill file for the integration you need, so OAuth setup follows one standard pattern. Then use the Task object to log what each agent run actually did.

Try it
Coding

GitHub Copilot code-review API: trigger reviews from your pipeline

Copilot code-review requests are generally available through GitHub's REST and GraphQL APIs, with selectable effort levels. Wire a CI step that requests a low-effort review on every pull request and a high-effort review only on PRs that touch sensitive paths such as auth or payments. You can also surface the results in an internal developer portal for organization-wide triage.

Try it
Coding

OpenAI Codex: delegate parallel coding tasks from one /agents view

Codex now supports voice-driven CLI control, reusable development environments, background cloud tasks, and an /agents view for managing delegated work. Define one reusable environment for your repo, then hand off independent jobs such as test coverage and a small refactor as background tasks. Review each result in /agents before merging.

Try it
The Arena

2 labs moved this week.

  1. Google DeepMindRecent Gemini 4 Argon stays with Fairwind cyber testers ahead of wider API and Ultra access nokiapoweruser.com · 03 OCT 202601
  2. AnthropicRecent Anthropic backs a $100 million academy to train 10,000 engineers anthropic.com · 02 OCT 202602
Builder Radar

2 receipts from the repos.

Primary sources, pulled by index
Receipts
  1. Behind: Amazon-Backed Strands Labs Open-Sources Decider 2B1 Issue strands-agents/harness-sdk#4765Human Overview

    Description. Strands Decider 2B1 is an open source, small, decision model.

    github.com
  2. Behind: OpenAI: cut agent costs with cached input reads Issue openai/codex#35493[App] Model picker shows duplicate GPT-5.6-Terra because codex-auto-review is exposed as Terra35493

    [App] Model picker shows duplicate GPT-5.6-Terra because codex-auto-review is exposed as Terra35493. New issue New issue Description. duarbdhks Summary. The Codex Desktop model picker shows GPT-5.6-Terra twice.

    github.com

Receipts come from the Firecrawl Developer Index (READMEs, docs, issues, merged PRs), first-party sources only. Quotes are verbatim.

THE DOJO · BUILD TODAY

Cut what each agent step costs before you scale it.

  1. 01

    Route routine choices locally. Load Strands Decider 2B through llama.cpp and point your agent's simple branch decisions at it, escalating only uncertain calls to a frontier model.

  2. 02

    Front-load your stable context. Move system instructions and tool schemas to the very top of every OpenAI API request so the cached-read discount applies, then compare a week of invoices against the prior week.

  3. 03

    Trial a free open-weights coder. Run Ling-3.1-flash on OpenCode against a few real tasks from your backlog and log where it holds up and where it breaks.

The Bottom Line

Frontier lineups will keep shifting, so the cheap layer is the part you control.

Google's Antigravity reshuffle shows that hosted model menus change on the vendor's schedule. A small local decider like Strands Decider 2B1 and OpenAI's discounted cached reads let you keep the expensive frontier model for the steps that need it, which makes the next swap less painful. Build your agents so the routing layer is yours and the top model is a setting you can change in one place.

Source: venturebeat.com
Receipts

Every number, and where it came from.

37 of 41 figures cited, 15 receipts: 2 verified, 11 reported, 2 estimated
  1. 012BAmazon-Backed Strands Labs Open-Sources Decider 2B.Venturebeat01 OCT 2026as publishedR
  2. 0290%...approximately 50% lower than GPT-5.6 equivalents and an approximately 90% discount on cached input reads, which...OpenAI: cut agent costs with cached input reads04 OCT 202603B search corroborationE
  3. 03120bClaude 4.6 and GPT-OSS-120b are removed on November 2, 2026.explainx.ai03 OCT 2026as publishedR
  4. 04$27 billionKyiv is also trying to close a $27 billion defense budget gap.Reuters03 OCT 202603B search corroborationV
  5. 059BPewDiePie Unveils Ajax, a Local 9B Model.Tech Insider03 OCT 2026as publishedR
  6. 0625BWith 560B total and 25B active parameters, Ant Group's open-weights Ling-3.1-flash is now free on OpenCode and ranks...explainx.ai03 OCT 202603B search corroborationV
  7. 0748%Tavus unveils Griffin, a real-time Human Interaction Model it says fooled 48% of people into thinking it was humanTavus, via Superhuman02 OCT 2026as publishedR
  8. 0876%a16z State of Markets II: tech drove 76% of S&P 500 earnings growth in 2026 as capital pivots to AI semiconductorsAndreessen Horowitz, via TLDR02 OCT 2026as publishedR
  9. 097,722.72S&P 500 close, +0.73% on the sessionYahoo Finance02 OCT 2026yfinance closeR
  10. 1027,190.86Nasdaq close, +1.19% on the sessionYahoo Finance02 OCT 2026yfinance closeR
  11. 11$84,803.70Bitcoin close, +0.36% on the sessionYahoo Finance04 OCT 2026yfinance closeR
  12. 12$2,686.81Ethereum close, +0.70% on the sessionYahoo Finance04 OCT 2026yfinance closeR
  13. 13$91.11Crude Oil (WTI) close, -1.90% on the sessionYahoo Finance02 OCT 2026yfinance closeR
  14. 1465 / 100Crypto Fear & Greed close, Greed on the sessionalternative.me04 OCT 2026as publishedR
  15. 157.2 / 10OpenAI API, Koda score across four dimensions04R dossier04 OCT 202604R dossier scoringE
V
Verified: the stat gate corroborated this figure against an independent search before publication.
R
Reported: the figure is carried as published by the linked source and was not independently corroborated.
E
Estimated: the figure is approximate or hedged, either in the source or by the stat gate.

Method names the computation path behind the row, from a closed vocabulary: as published, yfinance close, 03B search corroboration, 04R dossier scoring, not recorded.

A figure is money, a percentage, a spelled magnitude, a multiple, a rate carrying its unit, a score over its denominator, a thousands separated number or an index close. Bare integers and years are not counted, so a phrase like "over 100 integrations" carries no mark. A chart's own scale line is the axis of the level above it and is counted once, with that level.

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