GitHub says developers need to strengthen three skills in the AI era: learn to direct AI agents rather than merely use them, do not trust an AI's first answer, and use time saved with AI to tackle bigger problems. It points to GitHub Copilot's built-in Rubber Duck agent, which uses a second model to critically review plans, code, and tests and catch issues the first model missed.
Airbnb CTO Ahmad Al-Dahle described the company's shift to becoming AI-native: AI now writes 60% of its code, feature delivery has grown nearly 80% year over year, engineering PR throughput per person is about 1.6 times higher, and AI resolves about half of customer-support tickets independently.
Boris Cherny says users can now customize how Claude works and looks just by prompting it. He argues that different working styles call for different Claude experiences and encourages sharing mods as plugins. In the quoted announcement, @ClaudeDevs says Claude Code mods can change behavior, customize the UI, and add users’ own features; users can write them with a few lines of TypeScript or have Claude build them, then install them with /plugin in the CLI or desktop app.
Why it matters: Packaging customizations as shareable plugins lets people with different working styles exchange changes to Claude Code’s behavior, interface, and features through the same installation workflow.
Simon Willison's pure-Python WebAssembly engine pwasm reached version 0.2a0 after Claude Opus 5.5 took over and made 42 commits. It now supports almost the entire WASM specification. The PyPI wheel bundles working WASM builds of MicroPython, QuickJS, and Micro QuickJS. This release is still alpha, and the author says it is completely untrusted.
Google parent Alphabet released Gemini 4 Argon, saying it can handle coding, research, and writing and was specifically trained for defensive cybersecurity. It can autonomously find, verify, and patch critical software vulnerabilities.
Google DeepMind released frontier model Gemini 4 Argon, initially making it available through the Fairwind Program to trusted cybersecurity defenders before gradually expanding access. Pricing starts at $2 per million input tokens and $10 per million output tokens.
Why it matters: Gemini 4 Argon raises the maximum output to 1M tokens and reports multiple benchmark results and internal deployment data, offering a view of its limits on long-running workflows.
Google released Gemini 4 Argon, claiming industry-leading performance in coding, knowledge work, and cybersecurity, but for now it is available only to company engineers, with no public access.
OpenAI released its next-generation flagship model GPT-6 Astra at 1 a.m. Beijing time on September 4. Leiphone compiled first-hand tests from users who received access early.
Why it matters: Early user tests show GPT-6 Astra can check its own work on long tasks but still needs human oversight, revealing its capability limits.
StepFun released Step 5 Preview, scoring 44 on the Artificial Analysis Intelligence Index and ranking among the top two open models globally.
Leiphone compared free AgnesCode with Agnes 3.0 Flash against Codex with GPT-5.6 Sol on Task66, a DeepSeek-V3 operator optimization challenge from the Zhongzhi FlagOS competition.
The author tested Qwen3.8-Flash and GLM-5.3-Flash, released on the same day, in Claude Code on the same task: building a personal workspace from scratch with tasks, calendar, notes, a dashboard, and global search.
AWS announced that Claude Sonnet 5.5 is available on Amazon Bedrock and Claude Platform on AWS. It is positioned as a more efficient Sonnet model for coding and knowledge work, with lower per-task costs and faster speed for most tasks.
Why it matters: The source describes Sonnet 5.5 improvements for coding and document tasks, its division of work with Opus 5.5, and access through Bedrock.
OpenAI launched GPT-6.1 Sol at DevDay, saying it approaches GPT-6 Astra’s intelligence on agentic coding, computer use, and professional work, at one-fifth the standard input and output token price.
Why it matters: OpenAI launched GPT-6.1 Sol at DevDay at one-fifth the price, while also disclosing that GPT-6.1 Astra had been held back over safety concerns.
At DevDay, OpenAI introduced reusable cloud development environments for its Codex software engineering agent. They can be accessed from a computer, phone, or the cloud, enabling faster task startup and allowing teams to share approved settings and permissions.
At DevDay 2026 in San Francisco, OpenAI announced 25 updates spanning ChatGPT, Codex, GPT-6 models, and the API.
Why it matters: The overview explains how Dots, GPT-6.1 Sol, Codex, and the Agents API fit together among OpenAI’s agent products.
GPT-6.1 Sol is now generally available on Amazon Bedrock, offering stronger reasoning for agentic coding, computer use, and professional workloads. OpenAI says it matches GPT-6 Astra on DeepSWE v1.1 at about one-fifth the cost per task, and scores 6.4 percentage points above GPT-6 Sol’s best result.
Why it matters: The report gives GPT-6.1 Sol’s Bedrock availability and cost comparison, helping readers assess value for agentic coding tasks.
This is Ultrafast. Our premium speed tier, Ultrafast, delivers up to 8x token generation speed in Codex (300 tokens per second) and up to 6x in the API.
OpenAI announced a major upgrade to Codex Security Cloud, which now includes cybersecurity capabilities through Daybreak Blue by default. The service scans entire GitHub repositories, continuously reviews new commits, investigates and deduplicates findings, and prepares fixes for human review. It runs even when a laptop is closed and is available as a plugin in Codex desktop and web.
At DevDay 2026 in San Francisco, OpenAI announced Codex and API expansions: Codex adds reusable cloud development environments and Codex Security Cloud repository vulnerability scanning; the ChatGPT desktop app gains a code review view; and Codex CLI has been redesigned with voice-based task initiation and control.
Why it matters: The updates to security scanning, decision models, and speed tiers provide a view of changes to developer workflows and costs.
OpenAI has released GPT-6.1 Sol, saying it approaches the flagship GPT-6.1 Astra—which was delayed over safety concerns—in agentic coding, computer use, and office tasks, at about one-fifth the cost.
Why it matters: With flagship Astra delayed over safety concerns, readers can compare Sol and Astra with Opus 5.5 on price and benchmark gaps.
Simon Willison live-blogged the OpenAI DevDay 2026 keynote at Fort Mason in San Francisco. OpenAI unveiled Dots, a personal agent powered by Astra, ChatGPT Space, GPT-6.1 Sol, and an Ultrafast mode reaching up to 300 tokens per second.
Why it matters: The live notes track the announcements and demo mishaps as they happened, offering a view of how the new features worked in practice alongside the official messaging.
OpenAI has released GPT-6.1 Sol, positioning it as near-Astra intelligence for coding, computer use, and professional work. Standard API input and output tokens cost one-fifth as much as Astra.
Why it matters: OpenAI describes GPT-6.1 Sol as close to Astra in capability at one-fifth the API price, giving readers a basis for weighing cost against performance.
IQuest Research at Zhizhi Innovation Institute has released IQuest-Q1, a decoder-only Transformer with a sparse mixture-of-experts architecture, about 320B total parameters and about 15B active parameters. It is available on GitHub and Hugging Face.
Latent Space's AINews roundup of developments from September 24–25 says community feedback was positive after Opus 5.5 launched that week, especially for generating explainer videos with code.
Why it matters: The weekly roundup offers a quick look at model and agent-infrastructure developments, including community feedback on Opus 5.5's code-generated videos and how vendors position their new models.
Anthropic's Thariq Shihipar discusses the next phase of Claude Code on the Latent Space podcast, including Ask User Question, artifacts as persistent generative interfaces, multi-agent collaboration through Claude Tag and Projects, and Claude Mods for customizing the harness.
xAI's Grok 4.7 is now available on Amazon Bedrock with a 500K-token context window and four configurable reasoning levels: low, medium, high, and xhigh. It supports the Responses, Chat Completions, and Converse APIs, and is served through cross-region inference profiles at the bedrock-runtime endpoint.
Why it matters: The article details how to access Grok 4.7 on Bedrock and its four reasoning levels, helping readers weigh cost and latency for long-running agent tasks.
Anthropic has released Claude Sonnet 5.5. The company says it runs more than 30% faster and costs up to 30% less on most tasks. It retains Sonnet 5's pricing while outperforming its predecessor across benchmarks.
Why it matters: The author tests Sonnet 5.5's coding performance and availability on the free tier, and compares it directly with Opus 5.5.
OpenAI has opened the next phase of the Codex Originals project, inviting developers, researchers, and creators to share real stories and projects made with Codex. Interested participants can submit their experience and project details through the form below.
In his closing keynote at WeAreDevelopers World Congress North America, Simon Willison reviewed key LLM developments so far in 2026 in chronological order.
Simon Willison used Claude Opus 5.5 to turn three kākāpō parrot photos into Kākāpō Party, an HTML5 Canvas pixel animation. At least 20 parrots jump and celebrate, triggering effects such as confetti and balloons.
Proaction used Codex, GPT-Live-1, and GPT-6 Astra to build, operate, and sell a modern fleet-management service, increasing sales by 60% and saving more than 75 hours.
In a note dated September 24, 2026, Simon Willison said that the more time he spends working with coding agents, the more convinced he is that they make software engineering harder. Coding agents can produce astonishing results, he says, but getting their full potential requires exceptional discipline and knowledge.
Simon Willison has released commit-rewriter 0.2. The source says it is related to Git but does not describe its specific features or changes.
The GitHub Copilot app rebuilt its pull-request view to render huge PRs smoothly, including one with 2,200 files, more than one million changed lines, and over 400 inline comments. It separates document height into deterministic code geometry and dynamic-block geometry: code line heights are calculated precisely in advance, while dynamic blocks such as comments are anchored by stable keys to a file, line, and side, measured lazily, and adjusted only slightly to avoid scroll jumps.
Anthropic has released Claude Opus 5.5, the first model in its new Claude 5.5 family. The company says it reaches Claude Fable 5.1 levels on most tasks, costs 40% less to run than Opus 5, and becomes the default model in Claude Code and the Claude app.
Why it matters: Two labs launched new models and cut prices sharply on the same day, giving readers a way to compare their approaches to capability and per-task cost.
Simon Willison and Jesse Vincent will host an evening meetup for coding-agent builders in San Francisco on Wednesday, October 14. The informal Agentic Engineering show-and-tell encourages sharing unpublished work, unusual experiments, and unfinished projects; no formal talks or product pitches are planned.
Kimi K3 is now on Amazon Bedrock! Use Bedrock's access, encryption, and audit controls to run coding, document analysis, and extended agent workflows. Explicit prompt caching is supported. Start building with K3 on AWS 👉 https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-moonshot-ai-kimi-k3.html
A newly hired engineer at a large company says Claude Code generates everything on the team—specs, code, tests, PRDs, tickets and their handling, and reports. Engineers from L1 to L7 are all doing the same thing: chatting with Claude. No one reads the output, no one on the team likes this workflow, but they are told to produce as much as possible. Senior leaders repeatedly say pushing code is not the bottleneck and ask why progress is still slow; employees work 12 to 13 hours a day just to press Enter.
The latest GitHub Podcast examines five popular AI claims. AI-generated code still needs to be read and owned, with review effort scaled to risk; Skills and MCP address different needs, with Skills packaging team expertise and MCP standardizing connections to tools and data; and RAG is not dead, since it can coexist with agents, Skills, and MCP in one workflow. The episode also discusses judging AI fluency in hiring and how fine-tuning needs can signal codebase maintainability problems.
Latent Space's AINews roundup of developments from September 15–16 reports that Steve Yegge shut down Gas Town and acknowledged spending thousands of dollars a month on coding-agent subscriptions to build just that one project.
