Google parent company Alphabet has launched Gemini 4 Argon, a new AI model built to handle a variety of tasks such as coding, research, and writing. But it’s cybersecurity that Gemini 4 Argon is supposed to have a particular knack for, according to Google.
Sep 30, 2026 | Gemini 4 Argon delivers frontier performance in complex workflows across real-world software engineering, enterprise knowledge work like legal and finance, and cybersecurity defense. Today, we’re announcing our new frontier model, Gemini 4 Argon, which is rolling out to a set of trusted cyber defenders through our Fairwind Program.
GPT-6.1 Sol is now generally available on Amazon Bedrock, offering stronger reasoning for agentic coding, computer use and everyday professional workloads. OpenAI says it matches GPT-6 Astra on DeepSWE v1.1 at roughly one-fifth the cost per task, and exceeds GPT-6 Sol’s best result by 6.4 percentage points.
OpenAI's new GPT-6.1 Sol is supposed to come close to GPT-6 Astra for a fraction of the cost. The planned flagship model Astra is staying under wraps because of safety problems. OpenAI is betting on cost efficiency over peak performance.
Anthropic released its mid-tier Sonnet 5.5 model, saying it is 30% faster than Sonnet 5 and consumes tokens substantially more slowly. It is positioned as an everyday task assistant for coding and office document generation.
OpenAI introduced reusable cloud development environments for its software engineering agent Codex at Dev Day. Accessible from computers, phones or the cloud, they speed up task starts and allow teams to share approved settings and permissions.
OpenAI unveiled GPT-6.1 Sol at DevDay, claiming near-GPT-6 Astra intelligence in agentic coding, computer use and professional work, with standard input and output token prices just one-fifth as much.
OpenAI announced extensions to Codex and its API at DevDay 2026 in San Francisco. Codex adds reusable cloud environments, repository security scanning through Codex Security Cloud, a desktop code-review view and a redesigned CLI, while the Agents API gains Computer Use, Tool Search and Context Compaction.
OpenAI has released GPT-6.1 Sol, which it says offers intelligence close to Astra and is aimed at coding, computer use and professional work. The model's API input and output token prices are one fifth of Astra's standard price.
OpenAI has published a DevDay 2026 recap rounding up more than 20 announcements spanning GPT-6 Astra, ChatGPT, Codex, the API, safety and new tools for developers. The original gives only an overview and does not detail each update.
Latent Space's AINews rounds up developments from 9/24–9/25, noting positive community feedback since Opus 5.5 launched this week, particularly on generating explainer videos with code.
Anthropic's Thariq Shihipar discussed Claude Code's next phase on the Latent Space podcast, including Ask User Question, artifacts, Claude Tag, Projects and Claude Mods for customising the harness.
xAI’s Grok 4.7 is available on Amazon Bedrock with a 500K-token context window, four configurable reasoning levels—low, medium, high and xhigh—and support for the Responses, Chat Completions and Converse APIs.
AWS announced Claude Sonnet 5.5 availability on Amazon Bedrock and Claude Platform on AWS, positioning it as a more efficient Sonnet for coding and knowledge work, with lower cost per task and faster speeds for most tasks.
Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family, with output generation more than 30% faster and cost per task up to 30% lower. It approaches Opus 5.5 on several benchmarks.
OpenAI launched the next phase of Codex Originals, seeking real stories and projects from developers, researchers and creators using Codex. Interested participants can submit their experiences and project descriptions through the form below.
Simon Willison traced key LLM developments in 2026 chronologically in his keynote at WeAreDevelopers World Congress North America.
Simon Willison used Claude Opus 5.5 to generate the HTML5 canvas pixel animation Kākāpō Party from three kākāpō photos, showing at least 20 parrots jumping to music and throwing confetti.
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 over 75 hours.
In notes on 24 September 2026, Simon Willison said that the more time he spent working with coding agents, the more convinced he became that they made software engineering harder. He believes they can produce astonishing results, but realising their full potential requires exceptional discipline and knowledge.
Anthropic released Claude Opus 5.5, calling it the first model in the new Claude 5.5 family, matching Claude Fable 5.1 on most tasks at 40% lower running costs than Opus 5. It becomes the default model in Claude Code and the Claude app.
Simon Willison and Jesse Vincent will host an evening meetup for coding agent builders in San Francisco on Wednesday 14 October, as an informal agentic show-and-tell. Participants are encouraged to share unpublished attempts, unusual experiments and unfinished projects, without formal presentations or product pitches.
An engineer who joined a large company two weeks earlier says specifications, code, tests, PRDs, tickets and their handling, and reports are all generated by Claude Code. Nobody likes the approach, but they are told to deliver as much as possible. They repeatedly heard leadership say shipping code was not the bottleneck, while engineers from L1 to L7 worked 12–13 hours daily just pressing Enter, with nobody reading anything.
Latent Space's AINews roundup said Jev's launch video reached 36 million views within two days, with at least six reproductions or similar approaches: ModernBERT-based Laya, diffusion-based DiffusionGemmaJev, Qwen3.5-9B LoRA-tuned Bespoke Nimble, SemIf, Jevlike and Kev-0.5B.
The latest GitHub Podcast examines five AI development memes. AI-generated code still needs reading and accountability, with review proportional to risk. Skills package team experience, while MCP standardises connections to tools and data; they can combine. RAG is not dead: it provides relevant information beyond training data and can coexist with agents, Skills and MCP in one workflow.
Latent Space's AINews rounds up 15–16 September developments, highlighting two reality checks for coding-agent optimism. Steve Yegge shut down Gas Town and admitted that despite spending thousands of dollars monthly on coding-agent subscriptions, Gas Town was the only project he had built with them.
GitHub used the Copilot app and Copilot CLI to completely rewrite the Copilot agent runtime from TypeScript into over 800,000 lines of production Rust. AI agents wrote most of the code, delivered incrementally across 128 PRs, improving performance by several orders of magnitude.
Cognition uses GPT-6 Astra to improve Devin's ability to test software and demonstrate that it works, aiming to reduce engineers' code review burden and speed up delivery.
Copilot's built-in diff, terminal and browser panels enable review, execution and preview of AI code without switching applications. The diff highlights additions in green and deletions in red, supporting acceptance, comments or further edits. The terminal runs project commands with multiple windows, while the browser's Pick & Polish selects elements for agent adjustments.
César de la Fuente's lab uses Codex and ChatGPT to search the genomes of living and extinct organisms for candidate antimicrobial molecules to combat drug-resistant infections.
Mistral helped a European energy operator migrate 40,000 lines of Fortran 77 to C++, targeting a physics-heavy reservoir simulator without a test suite or centralised documentation. The team first built a numerical-alignment testing framework, used Skill.md to guide agents in exporting state snapshots and validating migrated modules, then launched over a hundred agents with Vibe CLI to analyse call trees and used Mistral OCR to organise scattered documents.
An MIT researcher used GPT-5.6 Sol with Codex to autonomously run quantum computing experiments, analyse results and calibrate qubits.
1Password engineers use Codex to rapidly build production-ready features and internal tools while maintaining strict security policies, improving engineering efficiency by 21%.
OpenAI disclosed internal data showing coding agents reshaping AI research, covering agent usage, experiment speed, task complexity and research acceleration.
GitHub released a research preview of Project HydraFusion, using runtime multi-model orchestration to deliver frontier-level coding through Copilot. Users can enable it via /experimental in GitHub Copilot CLI, paying each model's standard rates for tokens actually consumed.
Copilot app runs multiple agent sessions simultaneously in separate Git worktrees, preserving context without interference. The sessions view shows titles and progress, allowing switching and resuming without restating tasks. The article demonstrates funded sort development, accessibility review and testing in parallel in tailspin-toys.
Google DeepMind released Gemini 3.8 Flash and Gemini 3.8 Flash Cyber. The former targets long-horizon coding and autonomous agents, priced like 3.7 Flash at $0.75 per million input tokens and $3.75 per million output tokens.
Multiverse Computing published a paper proposing Quantization-Aware Healing (QAH). After compressing GPT-OSS 120B to 60B parameters and quantising it to MXFP4, the method distils directly from the original uncompressed model rather than a reconstructed bfloat16 checkpoint.
Google DeepMind released Gemini 3.7 Flash, positioning it as its strongest workhorse model for coding and agents, just three weeks after Gemini 3.6 Flash.
Epoch and METR released MirrorCode to test AI systems' ability to complete programming tasks requiring extended human effort. First announced in April, it is formally released after additional testing.