Company Overview
Anthropic is an American artificial intelligence public-benefit company focused on building reliable, interpretable, and safety-oriented AI systems. Founded in January 2021 by former OpenAI researchers, the company develops the Claude family of large language models for consumers, enterprises, and developers while pioneering safety research (including Constitutional AI).
Table of Contents
Anthropic Claude Models: Complete 2026 Guide
Anthropic’s Claude lineup has grown into a four-tier system, from lightweight, high-volume models to frontier-class reasoning systems. This guide covers every current Claude model, which one is the latest, which is generally considered the flagship, and which models make the most sense for coding, everyday use, and enterprise work — along with an overview of Anthropic as a company, its platforms, pricing structure, and main competitors.
Company Overview
Anthropic is an American artificial intelligence public-benefit company focused on building reliable, interpretable, and safety-oriented AI systems. Founded in January 2021 by former OpenAI researchers, the company develops the Claude family of large language models for consumers, enterprises, and developers while pioneering safety research (including Constitutional AI).
- CEO: Dario Amodei
- President: Daniela Amodei
- Founders: Dario Amodei, Daniela Amodei, Jared Kaplan, Jack Clark, Chris Olah, Ben Mann, Sam McCandlish, and Tom Brown
- Headquarters: San Francisco, California, USA
- Year Founded: January 2021
- Official Website: anthropic.com
- Official Newsroom: anthropic.com/news
- GitHub: github.com/anthropics
- X (Twitter): @AnthropicAI
Core Offerings & Platforms
- Claude Platform (claude.ai): Consumer and enterprise web, desktop, and mobile interface.
- Claude Code: Anthropic’s agentic coding tool for developers — usable from the command line, desktop app, or mobile app. It lets developers delegate coding tasks directly to Claude.
- Claude Cowork: An agentic knowledge-work desktop app built for non-developers, handling multi-step tasks across files and tools.
- Claude in Chrome, Excel, and PowerPoint: Task-specific agents for browsing, spreadsheet work, and slide creation.
- Claude Tag: A Slack-based interface that lets anyone tag @Claude into a channel to delegate tasks.
- Anthropic API: Developer access for building custom applications, workflows, and multi-agent systems on Claude Platform.
Which Claude Models Power Claude Code?
Claude Code isn’t tied to a single model — it’s built to work with whichever Claude model fits the task. In practice, that generally breaks down by workload:
- Claude Sonnet 5 is positioned as the balanced, fast-execution option, which is why it tends to be the default choice for day-to-day coding — writing functions, fixing bugs, working through a normal engineering backlog.
- Claude Opus 4.8 is built for frontier reasoning and multi-step agentic execution, making it the better fit for complex refactors, large multi-file changes, or engineering problems that require deeper planning.
Anthropic doesn’t publish a single “best model for coding” ranking, so the right choice ultimately depends on the complexity of the task and your latency/cost tradeoffs. (Model-to-workload recommendations here are based on how Anthropic positions each tier — check Anthropic’s own Claude Code documentation for their current guidance before making a purchasing decision.)
Claude Model Families
Anthropic’s Claude lineup spans four tiers, from lightweight to frontier-class:
| Tier / Family | Primary Capability | Use Case |
|---|---|---|
| Haiku | Ultra-fast, lightweight, cost-effective processing | High-volume automation, fast Q&A, lightweight data extraction |
| Sonnet | Balanced intelligence, fast execution, high efficiency | Daily workflows, software engineering, general-purpose enterprise tasks |
| Opus | Frontier reasoning, complex research, agentic execution | Multi-step engineering, deep analysis, legal/technical synthesis |
| Mythos | Anthropic’s newest tier, sitting above Opus | Most advanced reasoning and agentic capability; limited availability |
Named Claude Models (Current Lineup)
| Model Name | Tier | Notable For |
|---|---|---|
| Claude Haiku 4.5 | Haiku | Speed and cost-efficiency for high-volume tasks |
| Claude Sonnet 5 | Sonnet | Balanced daily-use model, including coding |
| Claude Opus 4.8 | Opus | Frontier-level reasoning and complex agentic work |
| Claude Mythos 5 | Mythos | Anthropic’s most advanced tier, sitting above Opus |
| Claude Fable 5 | Mythos | Same underlying model as Mythos 5, with additional safety measures for biology, cybersecurity, and LLM R&D |
Claude Mythos 5 and Claude Fable 5 are Anthropic’s first Mythos-class models, first released on June 9, 2026. On June 12, 2026, Anthropic temporarily suspended access to both models to comply with U.S. Department of Commerce export controls; the Department lifted those controls on June 30, 2026, and Anthropic restored access on July 1, 2026. Full details are available in Anthropic’s official statement.
Above Opus, Anthropic has also introduced a Mythos Preview model as part of “Project Glasswing” — currently available only to a small number of trusted organizations rather than the general public. More information is available at anthropic.com/glasswing.
Model IDs for the API
Developers building on the Anthropic API reference models by their model string rather than their marketing name:
| Model Name | API Model String |
|---|---|
| Claude Haiku 4.5 | claude-haiku-4-5-20251001 |
| Claude Sonnet 5 | claude-sonnet-5 |
| Claude Opus 4.8 | claude-opus-4-8 |
| Claude Fable 5 | claude-fable-5 |
(Claude Mythos 5 shares its underlying model with Claude Fable 5 but is accessed differently; check Anthropic’s API documentation at docs.claude.com for current model strings and availability, as these are updated periodically.)
Which Claude Model Should You Use?
There’s no single “best” Claude model — the right one depends on what you’re doing:
- Everyday tasks, writing, and general Q&A: Claude Sonnet 5 offers the best balance of speed and capability for most daily use.
- Coding and software engineering: Sonnet 5 for regular development work; Opus 4.8 for complex, multi-step engineering problems.
- High-volume, low-latency automation: Claude Haiku 4.5 is built specifically for this — fast, lightweight, cost-effective.
- Deep research, legal/technical synthesis, or the most demanding agentic work: Claude Opus 4.8, or Claude Mythos 5 / Fable 5 where availability allows.
- Frontier reasoning at Anthropic’s current maximum capability: Claude Mythos 5 (or Fable 5, which adds extra safety measures around biology, cybersecurity, and LLM R&D) sits above Opus as Anthropic’s newest and most capable tier.
If you’re unsure, Sonnet 5 is generally the safest starting point — it’s the tier Anthropic positions for “daily workflows” and general-purpose enterprise tasks, with Opus and Mythos available to step up to as task complexity increases.
Primary Use Cases
- Software development & agentic coding workflows
- Deep document analysis & long-context reasoning
- Multi-modal tasks (vision, document parsing)
- Enterprise knowledge management & research assistance
- Autonomous agent orchestration
Pricing Structure
- Individual Plans: Free, Pro, and Max tiers.
- Team & Enterprise Plans: Per-seat organizational tiers (Team / Team Premium / Enterprise).
- API Billing: Billed separately on a per-million-tokens basis (input vs. output).
(For current pricing figures, check Anthropic’s official pricing page — these change frequently.)
Main Competitors
- OpenAI (ChatGPT / GPT series)
- Google DeepMind (Gemini)
- xAI (Grok)
- Mistral AI
- Cohere
Frequently Asked Questions
What is the latest Claude model? As of this guide’s last update, Claude Mythos 5 and Claude Fable 5 are Anthropic’s newest models, released June 9, 2026, sitting above the Opus tier. Claude Opus 4.8, Claude Sonnet 5, and Claude Haiku 4.5 remain the current models across the other three tiers.
What are Anthropic’s current AI models? Anthropic’s current lineup spans four tiers: Haiku (Claude Haiku 4.5), Sonnet (Claude Sonnet 5), Opus (Claude Opus 4.8), and Mythos (Claude Mythos 5 and Claude Fable 5).
Which Claude model is best for coding? Claude Sonnet 5 is the typical default for day-to-day coding work in Claude Code, with Claude Opus 4.8 better suited to complex, multi-step engineering tasks. Anthropic doesn’t publish an official single “best for coding” ranking, so this depends on task complexity and cost considerations.
Is Claude open source? No. Claude models are proprietary and accessed through Anthropic’s API, Claude Platform, and related products — not released as open-source weights.
What is Anthropic’s flagship model? Opus has traditionally been described as Anthropic’s flagship reasoning tier. With the June 2026 launch of the Mythos tier, Claude Mythos 5 and Claude Fable 5 now sit above Opus as Anthropic’s newest and most capable models.
What are Anthropic’s latest model releases? The most recent releases are Claude Mythos 5 and Claude Fable 5 (June 9, 2026), which briefly had access suspended for export-control compliance between June 12 and July 1, 2026. Before that, Claude Sonnet 5, Claude Opus 4.8, and Claude Haiku 4.5 were Anthropic’s most recent model releases. See Anthropic’s newsroom for the latest announcements.
Bottom Line
Anthropic now organizes Claude into four tiers — Haiku, Sonnet, Opus, and the newly introduced Mythos — covering everything from high-volume automation to frontier-level reasoning. For most people, Sonnet 5 is the practical everyday and coding default, with Opus 4.8 and the Mythos-tier models available for the most demanding reasoning and agentic work. Because Anthropic ships new models and pricing changes fairly often, it’s worth checking Anthropic’s official newsroom directly for anything time-sensitive.