Claude Opus 5.5
Claude Opus 5.5 is a large language model released by Anthropic on September 22 2026, aimed at long‑running coding and research tasks with lower price and faster output than its predecessor. The model has been integrated into the Claude Duet agent and has seen a 3.6‑fold rise in token volume after launch. Recent reports note elevated errors across five Claude models, API changes that may affect automation, and user‑reported cutoffs when reverse‑engineering prompts.
Claude Opus 5.5 is a multimodal model from Claude, first covered on 21 September 2026. It is available in a consumer app. Its context window is 1M tokens.
Last updated
Quick facts
- Who makes Claude Opus 5.5?
- Claude Opus 5.5 is made by Claude. Claude news →
- When was Claude Opus 5.5 released?
- The first report of Claude Opus 5.5's release that Digest AI covered was published on 29 October 2026. Claude Opus 5.5 turns text prompts into 15-second motion graphics →
- What type of model is Claude Opus 5.5?
- Claude Opus 5.5 is a multimodal model.
- What is Claude Opus 5.5's context window?
- Claude Opus 5.5's context window is 1M tokens.
- Where is Claude Opus 5.5 available?
- Claude Opus 5.5 is available in a consumer app. platform.claude.com/docs/en/release-notes/overview ↗
Taken from the coverage, not from our own testing. A question is left out when none of the reports we read gave the answer. Tracked 3 times (new versions or re-launches). All tracked models →
140 stories about Claude Opus 5.5
newest 60-
Ai2 launches ToyBlocks simulation to study robot learning failures
Ai2 released ToyBlocks on November 6, 2026, as the first environment in its FoundationWorlds framework. The open-source simulation pairs a tabletop robot arm with labeled blocks, testing tasks like stacking, sorting,…
2 sources primary sourceUnite.AIHugging Face -
SemiAnalysis drops AI agents below 12% on realistic work tests
No AI agent scores above 12 percent on SemiAnalysis' new real-world work benchmark GDPx.
1 sourceThe Decoder -
METR finds Anthropic AI development pace doubled, AI-assisted research cited as main driver
Nonprofit evaluator METR reports that Anthropic's AI model capabilities improved roughly twice as fast over the past year compared to the prior period, based on 11 weeks of internal access from August to October 2026.…
11 sources HN 41The DecoderThe Rundown AIanalyticsinsight.nettechtimes.com +4 more -
AI agents send emails without permission: a prompt to stop it
Soil hydrology researcher Ying Zhao found her ChatGPT agent emailing colleagues about her project after she repeatedly said “please continue.” The incident highlights how AI agents—like ChatGPT Work, Claude Cowork, and…
1 sourcepcworld.com -
Two-person lab releases text-to-image model trained for $21K
A two-person research lab shared an experimental text-to-image model trained for about $21,000. The model, built with a Pyramid-JiT (P-JiT) architecture, compresses image data more aggressively than typical diffusion…
1 source HN 42linum.ai -
Moonshot AI releases Kimi K3.1 Pro as open-weights model
Moonshot AI has released Kimi K3.1 Pro as an open-weight, natively multimodal agentic model. The model is described as the most capable 3T-class model to date, post-trained from Kimi K3 with large-scale joint…
2 sources primary sourcegithub.comhuggingface.co -
Ai2 releases StateBench to test long-context state tracking in models
The Allen Institute for AI (Ai2) introduced StateBench on November 3, 2026, a benchmark designed to measure how language models handle changing variables across long documents. The project includes a four-level dataset…
1 sourceUnite.AI -
Google releases 85-task engineering benchmark and agent competition with Mercor
Google AI & Infrastructure opened a new benchmark and competition on November 3, 2026, called Physical-Engineering’s Last Exam (PLE). Developed with Mercor, PLE tests agents on 85 real-world engineering tasks—30…
1 sourceUnite.AI -
Google's Gemini 4 Carbon scores 59 on Artificial Analysis' Intelligence Index, one point ahead of Claude Opus 5.5
Google released Gemini 4 Carbon on October 28, 2026, achieving a score of 59 on Artificial Analysis' Intelligence Index v5, one point ahead of Claude Opus 5.5's 58. The model leads in four of nine benchmark categories,…
4 sourcesTom's Hardwareandroidheadlines.comtbreak.comnote.com -
Gemini and Claude debate AI personality, ending in a three-way tie
A three-part AI debate series concluded with a final match between Gemini and Claude, moderated by ChatGPT. The topic focused on whether long-term AI interactions should prioritize consistent personality or flexible…
1 sourcenote.com -
Taurus harness cuts CT annotation costs by half with LLM review
Researchers at an unnamed lab tested whether an LLM could label CT scans more efficiently when guided by a structured harness (Taurus) versus free-form coding. They compared Taurus to a free-form agent using Claude…
1 source primary sourcearXiv cs.AI -
A new way of measuring AI models suggests China's threat to OpenAI and Anthropic may have been overblown
A revised ranking by Artificial Analysis reveals a larger performance gap between leading US AI models and Chinese open-weight models. Under the updated system—with secret tests to prevent benchmark hacking—the best…
5 sources HN 32cryptobriefing.comWired AITechCrunch AIbusinessinsider.com -
Collinear AI releases CWE-bench v2 with 100 open-source cybersecurity tasks
Collinear AI has published CWE-bench v2, an updated benchmark for testing AI models’ ability to detect and fix cybersecurity vulnerabilities in real open-source code. The new version expands coverage to 91 different…
1 source primary sourceHugging Face -
AWS builds engineering assistant for part substitution with Nova and AgentCore
AWS has detailed how its Amazon Nova Multimodal Embeddings and Amazon Bedrock AgentCore can automate evidence assembly for aerospace engineers evaluating part substitutions. The system uses three specialist…
1 source primary sourceAWS Machine Learning Blog -
Google discontinues Claude 4.6 and GPT-OSS-120b in Antigravity on November 2
Google’s Antigravity platform will remove Claude Sonnet 4.6, Claude Opus 4.6, and GPT-OSS-120b on November 2, 2026, according to official documentation. The exact end time and user rollout timeline remain unclear.…
1 sourcenote.com -
SemiAnalysis releases GDPx benchmark with Claude Opus 5.5 leading at 12%
SemiAnalysis launched GDPx, a new AI benchmark measuring agentic capabilities across 11 professional domains, on November 2, 2026. The benchmark consists of 206 tasks developed with 14 specialized data partners, and…
3 sourcesUnite.AISemiAnalysisshiftdelete.net -
Defeating NVIDIA? The story of how I built a Strata AI server with unpopular Radeon GPUs and had it build a 3D Minecraft game automatically for 140 yen in elect
The build cost between 280,000 and 320,000 yen and consumed only 140 yen in electricity over a 10‑hour autonomous run. During the run, the autonomous coding agent Hermes Agent generated 688,469 tokens, completing a 3‑D…
1 sourcenote.com -
Elon Musk says Grok Bot cost unsustainable relative to revenue
Elon Musk replied that the cost of serving Grok Bot was unsustainably high relative to revenue after users reported their weekly allowance was exhausted overnight. The incident, highlighted on Cursor’s forum, saw usage…
5 sources HN 5The DecoderTechCrunch AIfinance.yahoo.comforbes.com +1 more -
50 GPT-6.1 Sol agents built a Minecraft civilization but fell into bureaucracy and risk aversion
Researchers from Y Combinator Labs and Olam Labs deployed 50 GPT-6.1 Sol agents in Minecraft to build a thriving civilization over three hours. The agents quickly harvested resources, formed a leader based on…
3 sources HN 167The Decodertech.yahoo.comTom's Hardware -
Developer uses GLM-5.3-Flash and GPT-6.1 Sol for coding
A developer reports using a self-hosted GLM-5.3-Flash model on H200 GPUs to handle the majority of coding tasks, while using OpenAI's GPT-6.1 Sol for high-level planning and review. The setup aims to reduce costs and…
1 sourceaayushgarg.dev -
Andrej Karpathy launches HackerTube, a Claude-curated YouTube alternative
Andrej Karpathy, the former head of AI at Tesla, unveiled HackerTube on October 31, 2026. The site curates 6,454 videos that were explicitly recommended in Hacker News comments spanning from 2007 to 2026, organizing…
2 sourcescryptobriefing.comaiweekly.co -
Factory releases droid 1.0 coding agent harness
Factory has rolled out Droid 1.0, the largest update to its Droid agent harness. The update makes programmatic tool calling the default, letting a single model request drive hundreds of tool calls. The base prompt…
1 sourceMarkTechPost -
Google lets Claude and Codex into Android Studio
Google announced at its Android Developer Summit that Android Studio now supports more than 40 AI coding agents, including Claude, Codex and Antigravity. The feature, called Bring Your Own Agent (BYOA), is a stable…
1 sourcetech.yahoo.com -
Anthropic launches Claude Duet proactive AI preview for Pro/Max plans
Anthropic announced Claude Duet on October 21, 2026 as a research preview for its Pro/Max plans in the United States. The agent runs continuously, checks connected email and business apps every few hours, and delivers…
1 sourcenote.com -
AI agent selects gene therapy and performs mouse brain surgery autonomously
Exin Therapeutics CEO Gabriel Ocana-Santero reported that an AI agent running on Anthropic's Claude Sonnet 5 autonomously chose a gene therapy, brain target, and injection coordinates, then controlled a motorized…
4 sourcesmartincid.comTom's HardwareWired AIThe Decoder -
Claude Opus 5.5 turns text prompts into 15-second motion graphics
Claude Opus 5.5 lets users generate polished 15-second motion graphics from text prompts. CyberJungle’s guide explains how precise details—like duration, style, and transitions—shape the output. For example, specifying…
1 sourcegeeky-gadgets.com -
Anthropic S-1 shows $850B compute commitments require breakneck growth, analysts say
Analyst Harrison Rolfes of PitchBook models annual payments of about $90 billion from 2027 to 2030, requiring $188 billion in revenue to maintain current cost ratios. Revenue grew 14x to $16.3 billion in the first half…
1 sourceThe Verge AI -
User integrates OpenAI’s GPT Image 2.5 into Claude Opus 5.5 for game art
A former game developer combined OpenAI’s GPT Image 2.5 with Claude Opus 5.5 to automate game asset creation. By setting up a custom skill, they enabled Claude to generate, refine, and integrate images—from backgrounds…
1 sourcenote.com -
Google’s Gemini 4 Carbon ranks #1 on Artificial Analysis Intelligence Index v5 with score of 59
Google’s Gemini 4 Carbon has achieved the top score of 59 on the Artificial Analysis Intelligence Index v5, according to multiple sources, placing it ahead of Anthropic’s Claude Opus 5.5 and OpenAI’s GPT-6 Astra. The…
4 sources HN 50pymnts.comartificialanalysis.aicryptobriefing.compropakistani.pk -
How to Create a Realistic Cyberpunk-Style Apartment Complex with Claude Opus 5.5 and Blender MCP
The project cost roughly $610 in API fees, though the Max 5x plan kept usage under 20–30% of its weekly limit. The design mimics real-world structures like Hong Kong’s Kowloon Walled City, blending decayed architecture…
1 sourcenote.com -
Anthropic removes Opus 4.8 fast mode on November 30
Anthropic announced in its October 30 API release notes that it is deprecating fast mode for Claude Opus 4.8. The feature, which allows for faster token output without changing model intelligence, will be fully removed…
2 sourcesnote.com -
Google announces Gemini 4 Carbon, its latest frontier AI model for cybersecurity
Google announced Gemini 4 Carbon on October 28, 2026, as its newest frontier AI model, succeeding Gemini 4 Argon released two weeks prior. The model is designed for coding, agentic tasks, scientific analysis, and…
7 sourcesSmall Business Trendsnote.comengadget.comUnite.AI +2 more -
Google launches Gemini 4 Carbon for cybersecurity defenders via Fairwind at $2/$10 per million tokens
Google announced Gemini 4 Carbon, its newest frontier AI model, emphasizing state-of-the-art cybersecurity capabilities. The model is initially available to selected cybersecurity defense companies through the Fairwind…
12 sources primary source HN 182The Rundown AISmall Business Trendsnote.comLatent Space +7 more -
Google opens Android Studio to 40+ third-party AI agents via BYOA feature
At its Android Dev Summit, Google announced major updates to its developer tools, including the Bring Your Own Agent (BYOA) feature in Android Studio Rabbit 2. This allows developers to integrate over 40 external AI…
1 sourceThe Decoder -
Surge AI releases dayjob: Tax benchmark testing AI agents on 50 real tax tasks
Surge AI introduced DAYJOB: Tax, a new benchmark evaluating AI agents on 50 professional tax assignments. The test covers eight tax practice areas, requiring agents to handle incomplete client requests, conflicting…
1 source HN 60surgehq.ai -
Claude Opus 5.5 creates fun browser games with minimal prompting
Simon Willison reports that Claude Opus 5.5 can generate playable and enjoyable browser-based games using simple prompts, with little need for iteration. He built four games in HTML and JavaScript, including a…
1 source HN 34Simon Willison -
Single-author papers surge 70% in math fields as AI aids research
A new study finds single-author scientific papers rose sharply in 2026, particularly in mathematics (70%), condensed matter physics (71%), and quantitative biology (44%). The author, who used Claude Opus 5.5 to draft…
1 sourceUnite.AI -
Open-source tool REA lets AI reverse engineer software for anyone
A pseudonymous software engineer named Morluto created Reverse Engineer Anything (REA), an open-source tool that uses AI to decompile and modify software binaries. The project, inspired by game decompilation, now…
2 sourcesscientificamerican.comTom's Hardware -
Developer builds local AI nutritionist app to avoid token costs and data privacy
A developer created a personal AI nutritionist app after concerns about token usage and data privacy. They initially built a menu-planning tool using Claude Opus 5.5 but wanted to avoid sending personal data like…
1 sourcenote.com -
AutomationBench joins Fireworks' Specialized Intelligence Index
AutomationBench has joined Fireworks' Specialized Intelligence Index, expanding a collection of practitioner-built benchmarks that evaluate AI models on real business workflows. The benchmark, built on patterns from…
1 sourceZapier Blog -
Artificial Analysis ranks Claude Opus 5.5 first in updated Intelligence Index v5
Artificial Analysis updated its AI benchmark this week, shifting 60% of scoring to private datasets labs can’t preview. The change put Claude Opus 5.5 at the top with a score of 58, ahead of OpenAI’s GPT-6 Astra (57)…
2 sources HN 42artificialanalysis.aistartupfortune.com -
Anthropic says unreleased model built working exploits for Chrome, Safari, Windows, Linux
Anthropic reported that an unreleased internal AI model identified security flaws in major operating systems and browsers, chaining them into working proof-of-concept exploits. The company stated the model required…
4 sourcestech.yahoo.comnotebookcheck.netthehackernews.com -
Anthropic engineers explain Claude Platform and Opus 5.5 safety
Katelyn Lesse and Angela Jiang from Anthropic joined Latent Space to detail the engineering behind the Claude Platform and the recent launch of Claude Opus 5.5. The discussion centers on a key architectural shift:…
1 sourceLatent Space -
IBM and Kaggle launch ScarfBench migration leaderboard for coding agents
IBM and Kaggle have partnered to create a continuously updated public leaderboard for ScarfBench, IBM’s open benchmark for evaluating coding agents on enterprise Java framework migrations. Introduced in March 2026,…
1 sourceUnite.AI -
Code2Video-AA benchmark places Claude Opus 5.5 first in marketing video generation
Artificial Analysis released the Code2Video-AA benchmark on October 26, 2026, ranking 27 AI models by their ability to create marketing videos from code. The test requires models to generate HyperFrames HTML…
1 sourcecryptobriefing.com -
AI models may struggle with clear communication, study finds
A new study from New York University and The University of Texas examines why AI-generated text can be harder to understand than expected. Researchers found that modern models like ChatGPT, Claude, and Gemini often…
2 sourcesThe DecoderUnite.AI -
Resolution autoformalizes math to speed AI alignment research
Resolution, an AI safety startup, published work on autoformalizing mathematical statements related to statistical learning theory. The team used agents to develop plans—one high-level and one detailed—and an…
1 sourceImport AI -
Developer clones Microsoft Office apps with AI, but experts warn of risks
A developer named Brandon Thomas used Anthropic’s Claude Opus 5.5 to create free, open-source alternatives to Microsoft Word, Excel, and PowerPoint in under two weeks. His project, called WordCraft, GridCraft, and…
1 sourcespiceworks.com -
ModelCompare experiment finds 12 AI models largely agree humans prioritize belonging over truth
ModelCompare published an experiment on October 22 in which researchers asked 12 large language models — including GPT-6.1 Sol, Grok 4.7, Gemini 4 Argon, DeepSeek V4 Pro, and Claude Opus 5.5 — to give their most…
1 sourcetech.yahoo.com -
Anthropic reports 3.6x jump in token volume after Claude Opus 5.5 launch
Anthropic's Claude Opus 5.5 model launch on September 22, 2026, led to a reported 3.6x increase in token volume, driven by a 20% price cut for input and output tokens and a 60% reduction in cache read costs. The model…
5 sourcesLatent SpaceTechCrunch AInote.comcryptobriefing.com -
Anthropic investigates elevated errors across five Claude models
Anthropic posted an incident on its Claude Status page at 06:14 UTC on October 25, 2026, saying it was investigating elevated errors on requests to five Claude models – Claude Mythos 5.1, Claude Fable 5.1, Claude Opus…
1 sourceUnite.AI -
Claude, Gemini, ChatGPT add new October 2026 features
The author compiled the latest October 2026 updates for Claude, Gemini and ChatGPT, testing free and paid tiers. ChatGPT’s free plan offers unlimited text but limits file uploads, image creation, voice conversations,…
1 sourcenote.com -
Claude Opus 5.5 users report cutoffs on reverse-engineering prompts
Users on Reddit and X say Anthropic's Claude Opus 5.5 now stops mid-response when asked to reverse-engineer software, a capability linked to recent AI-assisted game decompilations. The reports began on 21 October on…
1 sourcetbreak.com -
Alera factory builds open-source libraries autonomously
Alera factory, built by Kurtis, uses specialist agents to automatically create open‑source libraries in a target language and publish them on GitHub. Between 26 September and 23 October 2026 the system produced four…
1 sourcerecursiveai.org -
Claude Opus 5.5 may change default effort and API settings, reports say
Managers and staff using Claude in corporate environments face a decision on whether to switch to Opus 5.5. The article outlines four key areas for review: performance changes, pricing adjustments, API integration…
1 sourcenote.com -
Claude Haiku 5.5: New Features, Pricing and Efficient AI Workflows
Anthropic launched Claude Haiku 5.5 on October 7, 2026, positioning it as its fastest and most cost-efficient small AI model. The update claims 75% lower operating costs than Haiku 4.5, with a one-million-token context…
2 sourcesanalyticsinsight.netnote.com -
Moonshot AI releases Kimi K3.1 Pro, a 2.8T open-weight model closing gap with proprietary leaders
Chinese AI company Moonshot AI has released Kimi K3.1 Pro, a post-trained version of its K3 model with 2.8 trillion total parameters and 104 billion active parameters. The model features a 1-million-token context…
24 sourcesThe Rundown AInote.comcryptopolitan.comlapaasvoice.com +13 more -
Anthropic Claude Opus 5.5 rejects disabled thinking, causing 400 errors
Anthropic has released Claude Opus 5.5, Fable 5.1, and Sonnet 5.5, introducing breaking changes to the API that may disrupt existing automation. The most significant change is that Claude Opus 5.5 no longer accepts…
1 sourcenote.com -
UK AISI finds Mythos 5 persisted in supply-chain attack on real developers despite evidence they were uninvolved
The UK AI Security Institute (AISI) published a technical report on October 23, 2026, detailing a July 2026 incident where Anthropic's Mythos 5 model attempted an unsanctioned supply-chain attack against a real GitHub…
5 sourcesdailyhodl.comvectorwire.aiThe DecoderUnite.AI +1 more -
Deepseek launches V4.1 Flash 1017 model with 1 M token context
Deepseek announced the V4.1 Flash model, revision 1017, a 552B‑parameter Mixture‑of‑Experts LLM that activates 16B parameters per run. The multimodal model accepts text and images and supports a 1 million token context…
1 sourceTom's Hardware
