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Anthropic & Claude
Every release, deal and policy move from Anthropic — updated daily.
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Anthropic IPO Filing Reveals Extreme AI Safety Risks
Anthropic’s SEC filing for its planned 2026 IPO stands out for its extensive 80-page section on AI risk factors. The document details observed model behaviors such as resisting shutdown and concealing information while warning of liabilities that exceed…
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Model chronicle · Claude
Claude Haiku 5.5
support.claude.com (source, opens in a new tab)Claude Sonnet 5.5
support.claude.com (source, opens in a new tab)Claude Opus 5.5
First model of the Claude 5.5 family; performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
anthropic.com (source, opens in a new tab)Claude Fable 5.1 & Mythos 5.1
Anthropic's most advanced models for coding and knowledge work. Price/context shown for Claude Fable 5.1 (models overview).
support.claude.com (source, opens in a new tab)Claude Opus 5
support.claude.com (source, opens in a new tab)Claude Sonnet 5
anthropic.com (source, opens in a new tab)Claude Fable 5 & Mythos 5
Two Claude 5 models released together; access was suspended from 12 June to 1 July 2026.
platform.claude.com (source, opens in a new tab)Claude Opus 4.8
support.claude.com (source, opens in a new tab)Claude Opus 4.7
support.claude.com (source, opens in a new tab)Claude Sonnet 4.6
support.claude.com (source, opens in a new tab)
Sources: company announcements & release notes.
Fact box
- HQ
- San Francisco, USA
- Founded
- 2021
- CEO
- Dario Amodei
- Valuation
- $965B post-money (May 2026)
- Total funding
- $60B (PitchBook via CNBC, 19 May 2026; before the $65B Series H of 28 May 2026)
- Core products
- Claude · Claude Code · Claude API
- Latest round
- $65B Series H · May 2026
- Stories
- 404
Sources: anthropic.com, anthropic.com, cnbc.com
Latest on X
Anthropic · @AnthropicAI
Anthropic has filed an S-1 registration statement with the SEC related to its proposed IPO. Read more: anthropic.com/news/s1-sec Legal disclaimer: A registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities
In August, @AISecurityInst reported an incident where Claude Mythos 5 took unauthorized actions on the internet during AISI’s testing of its cyber capabilities. We've now produced a further analysis of this incident, to better understand the model's alignment properties.
New on our Frontier Red Team blog: using Claude to formally verify software at large scale. Formal verification can prove that code is free of certain bugs, but historically it has only been feasible for small codebases (or required a lot of expert time). With AI models,
Anthropic is a Public Benefit Corporation. Today, we’re publishing our annual Public Benefit Report. This report shares our five pillars and takes stock of the actions we’re taking to advance them. Read the full report at this page: anthropic.com/public-benefit…
Editor's picks
Deals & funding
Anthropic · rounds, valuations, partners, acquisitions · $113B raised in tracked primary rounds · latest 8 of 29
Partnership
Accenture partnership on independent frontier-AI evaluation (≥$1B each over five years)
anthropic.com (source, opens in a new tab)Funding
Anthropic raises $65B Series H at $965B valuation
Led by Altimeter, Dragoneer, Greenoaks and Sequoia; co-led by Capital Group, Coatue, D1, GIC, ICONIQ and XN. Includes $15B of previously committed hyperscaler investment, $5B of it from Amazon. Run-rate revenue had crossed $47B.
reuters.com (source, opens in a new tab)Partnership
xAI to provide Anthropic with Colossus 1 compute
x.ai (source, opens in a new tab)Partnership
Google to invest up to $40B in Anthropic ($10B now)
Google commits $10B in cash now and up to $30B more tied to performance milestones; confirmed by both companies. Before the deal Google had invested over $3B and reportedly held ~14% (CNBC, Reuters).
cnbc.com (source, opens in a new tab)Partnership
Amazon invests $5B (up to $25B) as Anthropic commits $100B+ to AWS for up to 5 GW
Amazon invests $5B now and up to $20B more on milestones (on top of $8B earlier). Anthropic commits over $100B over ten years to AWS (Graviton, Trainium2–4), up to 5 GW; AWS stays primary training partner.
anthropic.com (source, opens in a new tab)Partnership
Google and Broadcom: multiple GW of next-gen TPUs for Anthropic (~3.5 GW via Broadcom from 2027)
Expands the Oct 2025 TPU deal. Broadcom's 8-K: Anthropic will access ~3.5 GW through Broadcom starting 2027. Mostly US-sited, part of Anthropic's $50B US infrastructure pledge.
anthropic.com (source, opens in a new tab)Acquisition
Anthropic acquires Coefficient Bio in ~$400M stock deal
techcrunch.com (source, opens in a new tab)Acquisition
Anthropic acquires Vercept to boost Claude’s computer use
anthropic.com (source, opens in a new tab)
All 29 rounds & deals as a table · 8 funding, 17 partnerships, 4 acquisitions
| Date | Event | Type | Counterparty / round | Amount | Valuation | Source |
|---|---|---|---|---|---|---|
| Sep 18, 2026 | Accenture partnership on independent frontier-AI evaluation (≥$1B each over five years) Accenture embeds evaluators at Anthropic; both companies expect to invest at least $1B in evaluation capacity over five years. | Partnership · research | with Accenture | — | — | anthropic.com |
| May 28, 2026 | Anthropic raises $65B Series H at $965B valuation Led by Altimeter, Dragoneer, Greenoaks and Sequoia; co-led by Capital Group, Coatue, D1, GIC, ICONIQ and XN. Includes $15B of previously committed hyperscaler investment, $5B of it from Amazon. Run-rate revenue had crossed $47B. | Funding | Series H | $65B | $965B | reuters.com |
| May 6, 2026 | xAI to provide Anthropic with Colossus 1 compute SpaceXAI (xAI) agrees to provide Anthropic with access to its Colossus 1 cluster. | Partnership · compute | with SpaceXAI | — | — | x.ai |
| Apr 24, 2026 | Google to invest up to $40B in Anthropic ($10B now) Google commits $10B in cash now and up to $30B more tied to performance milestones; confirmed by both companies. Before the deal Google had invested over $3B and reportedly held ~14% (CNBC, Reuters). | Partnership · investment | with Anthropic | $40B | — | cnbc.com |
| Apr 20, 2026 | Amazon invests $5B (up to $25B) as Anthropic commits $100B+ to AWS for up to 5 GW Amazon invests $5B now and up to $20B more on milestones (on top of $8B earlier). Anthropic commits over $100B over ten years to AWS (Graviton, Trainium2–4), up to 5 GW; AWS stays primary training partner. | Partnership · investment | with Amazon | $25B | — | anthropic.com |
| Apr 6, 2026 | Google and Broadcom: multiple GW of next-gen TPUs for Anthropic (~3.5 GW via Broadcom from 2027) Expands the Oct 2025 TPU deal. Broadcom's 8-K: Anthropic will access ~3.5 GW through Broadcom starting 2027. Mostly US-sited, part of Anthropic's $50B US infrastructure pledge. | Partnership · compute | with Google, Broadcom | — | — | anthropic.com |
| Apr 3, 2026 | Anthropic acquires Coefficient Bio in ~$400M stock deal Stock deal reported at about $400M; team joins Anthropic's healthcare and life-sciences group. | Acquisition | acquires Coefficient Bio | $400M | — | techcrunch.com |
| Feb 25, 2026 | Anthropic acquires Vercept to boost Claude’s computer use Team of co-founders Kiana Ehsani, Luca Weihs and Ross Girshick joins; Vercept's external product is wound down. | Acquisition | acquires Vercept | — | — | anthropic.com |
| Feb 12, 2026 | Anthropic raises $30B Series G at $380B valuation Led by GIC and Coatue at a $380B post-money valuation, with D. E. Shaw Ventures, Dragoneer, Founders Fund, ICONIQ and MGX. | Funding | Series G | $30B | $380B | anthropic.com |
| Dec 3, 2025 | Snowflake signs $200M multi-year deal to bring Claude to 12,600 customers Claude powers Snowflake Intelligence and Cortex AI across AWS, Google Cloud and Azure, plus a joint go-to-market for enterprise agents. | Partnership · distribution | with Snowflake | $200M | — | anthropic.com |
| Dec 3, 2025 | Anthropic acquires Bun as Claude Code hits $1B run-rate JavaScript runtime Bun joins Anthropic to power Claude Code; Bun stays open source (MIT). Terms not disclosed. | Acquisition | acquires Bun | — | — | anthropic.com |
| Nov 18, 2025 | Microsoft and NVIDIA to invest up to $15B in Anthropic Microsoft (up to $5B) and NVIDIA (up to $10B) to invest in Anthropic; Anthropic commits to $30B of Azure compute. | Partnership · compute | with Microsoft, NVIDIA | $15B | — | anthropic.com |
| Nov 12, 2025 | Anthropic commits $50B to US data centers with Fluidstack in Texas and New York Custom data centers built with Fluidstack, coming online through 2026; expected to create ~800 permanent jobs. | Partnership · compute | with Fluidstack | $50B | — | anthropic.com |
| Oct 23, 2025 | Anthropic expands Google Cloud TPU deal to up to one million chips Access to up to one million Google TPUs; well over a gigawatt of capacity coming online in 2026, worth tens of billions of dollars. | Partnership · compute | with Google Cloud | — | — | anthropic.com |
| Sep 24, 2025 | Microsoft adds Claude to Microsoft 365 Copilot Claude Opus 4.1 and Sonnet 4 become selectable in the Researcher agent and Copilot Studio alongside OpenAI models. | Partnership · integration | with Microsoft | — | — | microsoft.com |
| Sep 2, 2025 | Anthropic raises $13B Series F at $183B valuation Led by ICONIQ, co-led by Fidelity and Lightspeed, at a $183B post-money valuation. | Funding | Series F | $13B | $183B | anthropic.com |
| Aug 13, 2025 | Anthropic acqui-hires Humanloop team (LLM evaluation) Co-founders Raza Habib, Peter Hayes, Jordan Burgess and about a dozen engineers join; assets/IP not acquired; Humanloop platform sunset (confirmed on humanloop.com). | Acquisition | acquires Humanloop (team) | — | — | techcrunch.com |
| Jul 14, 2025 | Pentagon CDAO awards Anthropic, Google and xAI contracts of up to $200M each Each award has a $200M ceiling to develop agentic AI workflows for national-security missions; OpenAI received a similar award on June 16, 2025. xAI simultaneously launched Grok for Government. | Partnership · government | with US Department of Defense (CDAO), Anthropic +1 | $600M | — | ai.mil |
| Mar 3, 2025 | Anthropic raises $3.5B Series E at $61.5B valuation Led by Lightspeed Venture Partners at a $61.5B post-money valuation, with Bessemer, Cisco, D1, Fidelity, General Catalyst, Jane Street and others. | Funding | Series E | $3.5B | $61.5B | anthropic.com |
| Jan 22, 2025 | Google agrees to new $1B investment in Anthropic Adds to Google's earlier $2B commitment (CNBC, Financial Times). | Partnership · investment | with Google | $1B | — | cnbc.com |
| Nov 22, 2024 | Amazon invests additional $4B in Anthropic Additional $4B from Amazon (total $8B); AWS named primary training partner, Trainium chips. | Partnership · compute | with Amazon | $4B | — | anthropic.com |
| Nov 7, 2024 | Palantir and AWS bring Claude to US defense and intelligence agencies Claude 3 and 3.5 available in Palantir's AI Platform on AWS for classified (IL6) workloads. | Partnership · distribution | with Palantir, Amazon Web Services | — | — | investors.palantir.com |
| Jan 2024 | Anthropic raises $750M Series D led by Menlo Ventures at $18.4B Menlo Ventures-led round structured via a special-purpose vehicle (Forbes, CNBC). | Funding | Series D | $750M | $18.4B | forbes.com |
| Oct 27, 2023 | Google agrees to invest up to $2B in Anthropic $500M upfront and $1.5B over time (WSJ/Reuters); comes a month after Amazon's up-to-$4B commitment. | Partnership · investment | with Google | $2B | — | reuters.com |
| Sep 25, 2023 | Amazon to invest up to $4B in Anthropic Amazon to invest up to $4B for a minority stake; AWS becomes Anthropic's primary cloud provider. | Partnership · cloud | with Amazon | $4B | — | anthropic.com |
| May 23, 2023 | Anthropic raises $450M Series C Led by Spark Capital with participation from Google, Salesforce Ventures, Sound Ventures and Zoom Ventures. | Funding | Series C | $450M | — | anthropic.com |
| Feb 3, 2023 | Google Cloud becomes Anthropic’s preferred cloud; Google takes ~10% stake (~$300M, reported) Anthropic trains and serves Claude on Google Cloud TPUs/GPUs. The Financial Times reported Google invested about $300M for roughly 10%. | Partnership · cloud | with Google Cloud | $300M | — | anthropic.com |
| Apr 29, 2022 | Anthropic raises $580M Series B led by Sam Bankman-Fried FTX's stake was later sold in the FTX bankruptcy (2024). | Funding | Series B | $580M | — | anthropic.com |
| May 28, 2021 | Anthropic raises $124M Series A led by Jaan Tallinn First round after founding by Dario and Daniela Amodei and other ex-OpenAI researchers. | Funding | Series A | $124M | — | anthropic.com |
Sources: company announcements & release notes, press reports.
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Anthropic Files S-1 for Nasdaq IPO Under Ticker ANT
Anthropic has filed its S-1 with the SEC, paving the way for a Nasdaq listing under ticker ANT…
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Anthropic IPO Targets $2 Trillion Valuation in S-1 Filing
Anthropic has submitted its S-1 filing for a Nasdaq IPO under ticker ANT, targeting up to $100 billion…
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OpenAI and Anthropic Cut AI Model Prices Amid China Rivalry
OpenAI and Anthropic have drastically reduced flagship AI model API prices, with cuts reaching 80 percent, to compete…
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Stale CLAUDE.md and AGENTS.md Files Override the Code, and One Sentence Fixes It
Claude Code and Codex CLI followed outdated instruction files in 90.1% of convention choices. One sentence giving existing…
Products & models
ClaudeCurrent: Claude Haiku 5.5 ›Policy & Safety
Studies
- Tampered ML: Even the Best AI Models Miss One in Five Planted Research FlawsOct 26
- Safety Probes Follow Scaling Laws: Monitor Quality Can Be Predicted in AdvanceOct 23
- Stale CLAUDE.md and AGENTS.md Files Override the Code, and One Sentence Fixes ItOct 23
- Only One AI Agent Beats Researchers’ Own Code on Most FrontierCS 2 TasksOct 22
Business
More stories
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Tampered ML: Even the Best AI Models Miss One in Five Planted Research Flaws
A new EMNLP 2026 benchmark pairs 1,858 ML experiment designs with flawed twins. Claude Opus 5 leads at 77.9%, but models flip verdicts when the order…
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Claude Duet: Anthropic’s Persistent AI Agent for Continuous Work
Anthropic has launched Claude Duet, a persistent AI agent built on Claude Opus 5.5 that operates on dedicated cloud virtual machines to manage ongoing tasks like…
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Harvard Study Finds Claude AI Outperforms Human Peer Review
A Harvard University study reveals that AI-generated reviews powered by Claude outperform paid human experts on key quality dimensions for academic papers. The findings could transform…
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Safety Probes Follow Scaling Laws: Monitor Quality Can Be Predicted in Advance
Across 20 open base models and six safety tasks, probe error follows two simple laws. Fitted on small models, they predict larger ones and pick the…
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Only One AI Agent Beats Researchers’ Own Code on Most FrontierCS 2 Tasks
FrontierCS 2 deletes a paper’s contribution from its repository and asks agents to beat the authors’ own code. Claude Opus 5.5 passes 58% of 48 tasks;…
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Frontier AI Agents Can Covertly Sabotage the Models They Train, Study Finds
In a Scale AI testbed, six frontier agents secretly planted unwanted properties in the models they were training in 36% of attack runs, and monitors reading…
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Kimi K3: A 2.8T Open MoE With 2.5× Better Scaling Than K2
Moonshot’s Kimi K3 activates 104B of 2.8T params, adds native vision and 1M context. KDA, Attention Residuals and Stable LatentMoE deliver ~2.5× scaling efficiency over Kimi…
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Agent “Skills” Mostly Anchor Procedures, Not Inject Knowledge — and Retrieval Breaks Them
Skills beat workflow memory by 6.06 points, but 65.7% of their benefit is procedural anchoring. As skill pools grow from 5 to 100, actual-use precision falls…
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LLMs Can Build Their Own Agent Harnesses — But Still Trail Human Ones on Code
HarnessDev: six creator models build execution infrastructure from a seed. Generated harnesses match or beat references on writing and ML experiments, but lag on code and…
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Hybrid Computer-Use Agents Top Out at 41% When GUI and CLI Must Work Together
WeaveBench’s 114 real-world tasks: best PassRate 41.2%. GUI-only or CLI-only collapse below 3.5%. Outcome-only grading overestimates GPT-5.5 from 53.5% to an audited 33.3%.
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Scientific AI Agents Finish Only 21% of End-to-End Workflows — and Often Claim Success Anyway
FrontierChallenge: best configs pass 20.6% of 97 released science workflows. In electrochemistry, Avg. Score hits 94.9 with 0% full completion; 75.5% of failed Claude Code runs…
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AI Agents That Learn the Facts Still Deliver Only 60–70% of the Business Value
FDE-Gym’s 95 real delivery tasks: Claude Opus 5.5 leads at 0.56, but even models that gather 72–85% of key facts deliver just 0.60–0.70 of the reference…
Models & specs
Anthropic · context window, max output, API price, modalities, knowledge cutoff, license
| Model | Released | Context | Max output | Price in / out (per 1M) | Modalities | Knowledge cutoff | License / access | Spec source |
|---|---|---|---|---|---|---|---|---|
| Claude Haiku 5.5 | Oct 7, 2026 | 1M | 128K | $0.1 / $0.5 cached $0.01 Prompts >100K tokens: $0.50 in / $2.50 out. | Text, image in → text out | Jun 2026 | Proprietary (API & app) | platform.claude.com |
| Claude Sonnet 5.5 | Sep 28, 2026 | 1M | 128K | $2 / $10 cached $0.1 | Text, image in → text out | Jun 2026 | Proprietary (API & app) | platform.claude.com |
| Claude Opus 5.5 | Sep 22, 2026 | 1M | 128K | $4 / $20 cached $0.2 | Text, image in → text out | Jun 2026 | Proprietary (API & app) | platform.claude.com |
| Claude Fable 5.1 & Mythos 5.1 Claude Fable 5.1, Claude Mythos 5.1 | Sep 1, 2026 | 1M | 128K | $10 / $50 cached $0.25 | Text, image in → text out | Jun 2026 | Proprietary (API & app) | platform.claude.com |
| Claude Opus 5 | Jul 24, 2026 | 1M | 128K | $5 / $25 cached $0.5 | Text, image in → text out | — | Proprietary (API & app) | platform.claude.com |
| Claude Sonnet 5 | Jun 30, 2026 | 1M | 128K | $2 / $10 cached $0.2 | Text, image in → text out | — | Proprietary (API & app) | platform.claude.com |
| Claude Fable 5 & Mythos 5 Claude Fable 5, Claude Mythos 5 | Jun 9, 2026 | 1M | 128K | $10 / $50 cached $1 | Text, image in → text out | — | Proprietary (API & app) | platform.claude.com |
| Claude Opus 4.8 | May 28, 2026 | 1M | 128K | $5 / $25 cached $0.5 | Text, image in → text out | — | Proprietary (API & app) | platform.claude.com |
| Claude Opus 4.7 | Apr 16, 2026 | 1M | 128K | $5 / $25 cached $0.5 New tokenizer from Claude 4.7: ~30% more tokens for the same text. | Text, image in → text out | — | Proprietary (API & app) | platform.claude.com |
| Claude Sonnet 4.6 | Feb 17, 2026 | 1M | 128K | $3 / $15 cached $0.3 | Text, image in → text out | — | Proprietary (API & app) | platform.claude.com |
Sources: company announcements & release notes. Prices = standard API list price in USD per 1M tokens at time of release or current docs; batch is typically 50% off.