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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 13

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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

Research · AnalysisMulti-agent vs. single-agent coding: Vals AI finds agent teams cost 1.8× to 5.1× more for one significant gainVals AI ran GPT-6 Sol and Claude Opus 5.5 on 50 Vibe Code Bench web apps, alone and as agent teams. Teams cost 1.8× to 5.1× as much, and only one of four team-vs-single comparisons showed a statistically significant quality gain.Oct 13·7 min read

Research · AnalysisSakana AI's Multi-Layered Review: a Claude-based peer-review system that finds planted errors, and where it falls shortSakana AI's Multi-Layered Review (MLR), described in a TMLR paper, uses three Claude agents to review ML papers. On a new benchmark of 1,164 planted contradictions it caught more than 70% of errors in papers' main claims, about four times the best prior system. On real withdrawn papers and manipulated submissions, the gains shrink.Oct 13·7 min read

Models · AnalysisWhat the Claude Opus 5.5 system card actually saysAnthropic's system card for Opus 5.5 runs past 220 pages. What it says on bio and cyber risk, sandbox escapes, prompt injection and alignment, and what it leaves out.Oct 9·7 min read

Models · BenchmarksLong-context recall: what independent benchmarks say "1 million tokens" really buys youEvery frontier API now accepts about a million tokens. Independent evaluations from RULER to ATLAS show how much of that window models actually use.Oct 9·9 min read

Products · CompareChatGPT vs Claude for coding and writing: plans, models and limits comparedBoth start at $20 and go to $200 or more. We compare the models each plan gets, Codex vs Claude Code, context, limits and what leaderboards show.Oct 9·Checked Oct 9

Products · ExplainerThe Claude app, explained: plans, models, Cowork and how usage limits workClaude now covers chat, the Cowork agent, a Chrome extension and Claude Code under one subscription. Here's what each plan gets in October 2026.Oct 9·7 min read

Models · ExplainerReasoning models explained: thinking tokens, what they cost, and when to use themClaude, GPT-6 and Gemini all bill hidden thinking as output tokens. How each vendor exposes it, what it costs in practice, and when to turn it down.Oct 9·7 min read

Models · GuideWhich Claude model should you use? The current lineup and official pricesOpus 5.5 is Anthropic's default pick, Haiku 5.5 (October 7, 2026) is far cheaper than Haiku 4.5, and Fable 5.1 is for the hardest jobs. The verified lineup, every price, and how to choose.Oct 9·9 min read

Developers · GuideBuild your first agent with the Claude Agent SDK (TypeScript, October 2026)Install @anthropic-ai/claude-agent-sdk, call query(), lock down tools and permission modes, add a custom MCP tool and a safety hook, and cap spend. Code type-checked against v0.3.293.Oct 9·7 min read

Industry · ExplainerAnthropic explained: history, products and how it makes moneyFounded in 2021 by former OpenAI staff, Anthropic was valued at $965 billion in May 2026. Here's how it's governed, funded and paid, and what's unresolved.Oct 9·9 min read

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