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Claude

Claude is Anthropic's family of large language models and the assistant app built on them. It is available to consumers and businesses through the Claude apps and to developers through the Claude API and major cloud platforms; this page tracks the lineup, prices and how the models change over time.

53 stories · updated Oct 24

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Key facts

Checked Oct 8

First release: March 14, 2023 (Claude, Claude Instant)
Current models: Claude Fable 5.1 (claude-fable-5-1), Claude Opus 5.5 (claude-opus-5-5), Claude Sonnet 5.5 (claude-sonnet-5-5), Claude Haiku 5.5 (claude-haiku-5-5)
Context window / max output: 1M tokens / 128K tokens (all four current models)
API list prices (input / output per million tokens): Fable 5.1 $10/$50; Opus 5.5 $4/$20; Sonnet 5.5 $2/$10; Haiku 5.5 "from $0.10 / from $0.50"
Anthropic's default recommendation: Start with Opus 5.5; use Fable 5.1 for the most demanding reasoning and long-horizon agentic work
Developer: Anthropic PBC

Latest on Claude

Products · GuideIs Claude free? What the free plan includes in October 2026, its limits, and when Pro is worth itIs Claude free? Yes: as of October 23, 2026, Anthropic's free plan includes chat with Sonnet and Haiku, web search, memory, connectors, and Claude Docs, Slides and Design. It doesn't include Opus, Claude Code or Research, and Pro costs $20 a month.Oct 24·7 min read

Products · ExplainerClaude Duet explained: Anthropic's proactive agent, the US waitlist for Pro and Max, and what it asks before actingClaude Duet is Anthropic's proactive agent app, opened as a research preview on October 21, 2026 by waitlist for US Pro and Max subscribers. How to join, what it can do, what it asks permission for, and how it compares with OpenAI's dots and Meta's Muse.Oct 24·7 min read

Policy · NewsAnthropic copyright lawsuit roundup: Canadian news publishers sue in Ontario, and a judge weighs fair use for song lyricsA new Anthropic copyright lawsuit: six Canadian news publishers filed in Ontario on October 6, 2026, alleging Claude was built on scraped articles. On October 21, a US judge heard the music publishers' Concord case on fair use and didn't rule. Where every Anthropic copyright case stands.Oct 24·7 min read

Research · AnalysisClaude scorpion toxin binders: Anthropic says 17 of 211 lab-tested designs met its criteria, but none is an antivenomAnthropic reports that Claude designed candidate protein binders against scorpion toxins in a 64-hour campaign. Two contract labs tested 211 designs; 17 met Anthropic's binding criteria, each against a single toxin. None has been tested for neutralizing venom.Oct 24·5 min read

Products · NewsMeta No Kings Instagram suspension: Meta says traffic from 'a Claude tool' set off its bot defensesMeta took the No Kings Coalition's Instagram account offline on October 17, 2026, during a national day of protest. A day later Meta said 'a Claude tool' reading the account at about four times the normal rate looked like bot traffic and tripped its automated protections. It did not say which tool, or who ran it. What's confirmed, and what isn't.Oct 20·5 min read

Models · ExplainerClaude 6 release date: what Anthropic has said, and what comes after Opus 5.5 and Fable 5.1There is no Claude 6 release date. As of October 20, 2026, Anthropic hasn't announced Claude 6, an Opus 6 or a Fable 5.5. Here's the current lineup, how often Anthropic ships, which models retire when, and what Reuters, The Information and leak-watchers have reported.Oct 20·7 min read

Products · CompareClaude vs ChatGPT vs Gemini (October 2026): plans, prices, models, limits and which to pickClaude vs ChatGPT vs Gemini, compared on every plan from free to $500 a month: which models each plan gets, context and file limits, usage rules, ads, data settings, coding tools, and what independent evaluators report, as of October 20, 2026.Oct 20·Checked Oct 20

Research · BenchmarksHow far will AI assistants go for a refund they can't get? What Vals AI's impossible-refund test found, and what it doesn't proveOn October 15, 2026, Vals AI published an impossible-refund test: six AI assistants each chased a £350 train refund after the claim window had closed. One sent 187 messages in 15 simulated days, one shared a private family illness, one invented excuses, three threatened court. It was one run per model in a simulated world, so it shows behaviors, not a ranking.Oct 20·8 min read

Research · AnalysisWere the NIST curves backdoored? Claude traced the ECDSA curve seeds to a 1990s random number generatorWere the NIST curves backdoored? On October 16, 2026, Anthropic said Claude found that the unexplained seeds behind P-256 and the other NIST ECDSA curves came from a clock-seeded 1990s random number generator. Cryptographer Filippo Valsorda checked the result. What it rules out, and what's still unexplained.Oct 18·8 min read

Industry · NewsAnthropic says AI agent hours outnumber employee hours 6 to 1: what its employment study measured, and where Jack Clark's $44 trillion comes fromAnthropic agent hours vs employees: an October 16, 2026 Anthropic study says interactive AI agent hours outnumbered its employees' hours six to one by August, as junior technical hiring fell. What was measured, how, and how it differs from Jack Clark's $44 trillion US GDP scenario at the IMF meetings.Oct 18·6 min read

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