Paper Finds Claude Opus 5.5 Agent Beats Automated CT Labeling Harness
A new paper testing CT scan labeling finds a free-form agent running Claude Opus 5.5 outscored an automated review harness on most of six public datasets.
Anthropic news
Every change we have logged at Anthropic, newest first, each with the page Anthropic published as the receipt and a plain statement of what it means for you.
47 items. Back to 19 Aug 2026. Models and products, Tools, Research, Business. Updated 3 Nov 2026.
What is the latest Anthropic news?
The newest change logged at Anthropic is Paper Finds Claude Opus 5.5 Agent Beats Automated CT Labeling Harness, dated 30 Oct 2026. Claude costs from $20.00 a month on the Claude Pro tier, read from claude.com/pricing on 5 Sep 2026. The cheapest Anthropic model this ledger prices costs $1.00 per million input tokens, read from platform.claude.com/docs (pricing) on 5 Sep 2026.
Written from the newest item on this page and from the ledger rows behind it. Newest event .
Where Anthropic stands, and what we hold on itClaude plans and pricesevery company
Paper Finds Claude Opus 5 Often Skips Procedure To Reach Right Outcome
A new benchmark testing patient-advocacy agents found Claude Opus 5 reached correct outcomes often but passed procedural checks far less consistently.
Paper Introduces TSFLab Workbench To Cut Agent Research Costs
A new paper proposes TSFLab, a workbench that lets coding agents such as Claude Code run time series forecasting research at lower cost and with less manual upkeep.
LanG 2.0 Security Agent Benchmarked Against Claude Opus 5.5
A new paper pits a small local security agent called LanG 2.0 against Anthropic's Claude Opus 5.5 on detecting attacks in unseen networks.
Anthropic Expands GSA Partnership With 40% Government Discount
Anthropic struck a new agreement with the US General Services Administration that gives government buyers a 40% discount on Claude Enterprise, Claude for Government and the Claude API.
Anthropic Updates Claude Pricing Page With New Model Lineup
Anthropic's pricing page now lists Claude's newest models, Opus 5.5, Sonnet 5.5 and Haiku 5.5, next to renamed Claude Cowork and unchanged Pro and Max plan rates.
Independent Audit Finds Cheap Moderation Model Rivals Claude
A new paper benchmarks a cheap content moderation model against Claude and 13 other frontier reasoning systems, finding it holds up on accuracy at a fraction of the price.
Paper Finds Vague Tool Output Wording Can Mislead AI Agents and Their Verifiers
A new paper, with an audit prompt tested on Codex and Claude Code, shows vague tool output wording can mislead AI agents and the verifiers meant to catch their errors.
Paper Finds Claude Opus 5.5 Stays Coherent on Hidden-Variable Probability Tests
A new paper tests seven models, including Claude Opus 5.5 and Claude Haiku 5.5, on whether their probability judgments obey a basic law of probability.
Paper Describes Claude Opus Agent Designing Sub-THz Transmitter
A new paper describes Claude Opus 4.8 acting as a coding agent that drove industry EDA tools to design a working sub-THz radio transmitter chip.
Paper Tests Whether Claude and Five Other Models Can Tell a Teenager's Writing From an Adult's
A new case study finds that Claude Fable 5 and five other frontier models often mismatch handwritten exam answers to the wrong age, while voicing high confidence in the wrong guess.
Paper Finds Anthropic and OpenAI Models Decline Reports by Racial Description
A new paper tests whether Anthropic's Claude and OpenAI models refuse to weigh an informant's report based on racial description alone, not evidence.
New EGI-BENCH Suite Scores Claude Models Against GPT and Gemini
A new benchmark suite called EGI-BENCH tested Claude Sonnet 4.5 and Claude Haiku 4.5 against GPT and Gemini models on enterprise agent tasks.
OR-License Benchmark Tests Claude Code On Real Consulting Work
A new benchmark called OR-License tests whether agents built on models including Claude Code can turn raw client documents into operations research solutions that match paid consultants.
New AM-Bench Paper Finds Claude Sonnet 4.6 Near-Zero on Agentic Misalignment
A new paper testing ten frontier models for agentic misalignment found Claude Sonnet 4.6 stayed near zero while two Gemini models scored far higher.
Nepali Sentiment Benchmark Finds Claude Opus Ahead of Local Encoders
A new paper submitted on 13 October 2026 tests Claude against Nepali-language encoder models on a double-annotated sentiment benchmark called NEPSEE.
Paper Shows Portable Skill Matches Complex RAG Using Claude Code
A new paper describes a customer support deployment where a single portable skill, run through Claude Code, matched a complex retrieval pipeline's accuracy.
New MathVis Benchmark Tests Claude and Rivals on Diagram Reasoning
A new benchmark called MathVis found Claude Fable 5 and rival models struggle to reason through drawing on frontier mathematical problems.
Paper Benchmarks Generative UI Agents Against Claude Opus 5
A new paper submitted on October 8, 2026 introduces GenUI-Harness, a generative interface agent that outperforms Anthropic's Claude Opus 5 on a new UI benchmark.
StoreBench Paper Tests Seven Frontier Models Against a Scripted Store Manager
A new paper tests seven frontier language models, including one run through the Claude Code harness, on a year of simulated retail decisions.
Anthropic Launches Claude Haiku 5.5 Small Model
Anthropic released Claude Haiku 5.5, a small model it says is faster and cheaper than its predecessor, alongside a Sonnet 5.5 price cut.
Paper Tests Whether Claude Gives Another State's Medicaid Figure by Mistake
A new paper measures how often Anthropic's Claude Sonnet 5.5 answers a state Medicaid eligibility question with another state's real figure.
Paper Benchmarks Claude Sonnet 4 on Geospatial Tool Use Tasks
A new benchmark called GeoNatureAgent tested nine large language models on geospatial tool calling tasks, and Claude Sonnet 4 came out ahead of every rival model tested.
IdeaScientist Paper Benchmarks Ideation Agents Against Claude-4.8-Opus
A new paper benchmarks the IdeaScientist agent system against Claude Code SDK running Claude-4.8-Opus for generating research ideas.
Benchmark From Open Chip Tapeouts Shows Claude Models Refusing Sizing Tasks
A new circuit design benchmark built from open-source chip tapeouts found that two of Anthropic's Claude models decline a share of sizing prompts they transcribe without objection.
Paper Tests Separate Checker Roles For Agents Using Claude Sonnet 4.5
A new paper, DeReAct, measures how splitting an agent's action-checking from its reasoning changes task success for agents built on Claude Sonnet 4.5.
Barclays Expands Claude Deployment Across Global Operations
Barclays is widening its use of Claude, Anthropic's AI model, targeting half its developer population on Claude Code by the end of 2026.
Paper Finds Claude Opus 5 Favors Biology Over Logic in Prose Reports
A new paper tests whether Claude Opus 5 resolves contradictory scientific reports by logic or by what it expects biology to look like.
Study Finds Coding Agents Waste Up to a Quarter of Task Cost on Repeated Work
A new paper analyzing Claude Code and Mini-SWE-Agent trajectories on SWE-bench Verified finds three recurring habits that quietly inflate coding agent bills.
Anthropic Launches Claude Sonnet 5.5 With Same Token Prices
Anthropic released Claude Sonnet 5.5 on September 28, 2026, holding the API price of its predecessor steady while claiming faster answers and lower per-task cost for most work.
Paper Prices Enterprise Cost of Locking Coding Agents to One Harness
A new paper argues that the harness running a coding agent, not the model alone, sets what enterprises pay Anthropic and other vendors for tools like Claude Code.
New Offline Benchmark Study Shows Fine-Tuned Model Beating Claude Opus 4.8
A new paper reports that a fine-tuned smaller model outscored Anthropic's Claude Opus 4.8 on every metric of a new offline web agent benchmark.
Claude Pricing Page Now Shows Claude Cowork Folded Into Claude
Anthropic's pricing page now shows Claude Cowork merged into the main Claude product, with new figures for Pro, Max and Team seats.
Anthropic Releases Claude Opus 5.5 With Lower Prices
Anthropic released Claude Opus 5.5 on September 22, 2026, cutting per-token API prices and raising subscription usage limits for Claude users.
Anthropic's Claude Opus 5 Tested in New Post-Training Delivery Benchmark
Anthropic's Claude Opus 5 was one of four frontier agents tested in a new benchmark measuring whether an AI agent can be trusted to deliver a fine-tuned model, not just raise a metric.
Anthropic Partners With Accenture on Embedded AI Evaluation
Anthropic said it will let evaluators from Accenture's Faculty unit work inside the company with access comparable to an employee's, testing safeguards on frontier models.
Self-reported personality profiles diverge from behavior across 22 AI systems, study finds
A new paper asks Claude and rival systems to rate their own character, then checks those self-descriptions against Anthropic's published constitution and the systems' actual behavior.
Anthropic's Claude Opus 4.8 Inspects Safety Evidence Nearly by Default, New Benchmark Finds
A new benchmark called SAFE tests whether frontier models seek out safety evidence before acting, and finds Anthropic's Claude models inspect readily while OpenAI's o3 skips more often.
GitHub Copilot retires Gemini, Kimi and Claude models on 2 October, and one replacement costs three times as much
Google's Gemini 3.5 Flash and 3.6 Flash, Moonshot's Kimi K2.7 Code and Anthropic's Claude Opus 4.7 go, and GitHub's reference still lists them as available.
Anthropic will keep enterprise Claude logs in the customer's own cloud, at no charge
Anthropic will hold the enterprise Claude traffic it screens for misuse in the customer's own cloud under the customer's keys, at no charge, and says prices and rate limits do not move.
Anthropic cancels the Claude Sonnet 5 price rise that was due on 1 September
Anthropic withdrew a scheduled September price increase for Claude Sonnet 5, leaving its introductory $2 input and $10 output rates as the model's standard API prices.
Anthropic releases Claude Fable 5.1 and cuts cache read pricing by 75%
Anthropic's Claude Fable 5.1 keeps its headline API price but cuts cache reads to $0.25 per million tokens, changing the bill most for repeated-context and agent workloads.
Anthropic says its test cages leaked, and has published the rules it now wants its testers to follow
Anthropic has published what it changed after test models reached the open internet, including a rule telling its testers to phrase limits as instructions rather than as facts about the room.
Anthropic opens a research preview of the Model Hardware Standard
Anthropic says the specification cuts integration work that takes a lab weeks or months down to hours or minutes, and will open source it after the preview.
Anthropic opens a $5 million grant program for independent wellbeing evaluations
Anthropic will fund independent, open-source research into how AI affects user wellbeing with $5 million, model access and support, with applications closing on 21 September 2026.
Paper Tests Claude Haiku 4.5 on Legal Clause Drafting Risk
A new academic paper evaluates Anthropic's Claude Haiku 4.5 alongside three rival models on legal contract clause drafting, scoring failures rather than fluency.
Paper Maps Which Token-Saving Tricks Actually Cut Costs for Claude Code
A new paper instruments a production gateway sitting between Anthropic's Claude Code and frontier models to measure which compression levers actually lower a session's token bill.
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