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Claude AI Guide 2026: Opus 4.7, Mythos, Features, Pricing, and Best Uses

Claude has evolved fast. In May 2026, it is no longer just a chatbot. It is a full ecosystem: a terminal-based coding agent, a desktop app that reads your screen, a collaborative workspace for teams, and a lineup of models from cheap and fast to genuinely frontier-level.

Between January and May 2026 alone, Anthropic shipped Opus 4.6, Sonnet 4.6, Opus 4.7, Computer Use, Claude Cowork, a redesigned desktop app, and the Claude Mythos Preview. Most blog posts from even two months ago are already dated. This guide pulls everything into one place, verified as of May 23, 2026.

The Claude Model Lineup

Anthropic runs four distinct model tiers. You do not need all of them. You need the one that matches your task.

ModelBest forAPI Pricing
Opus 4.7Complex reasoning, coding, agentic work$5 in / $25 out per 1M tokens
Sonnet 4.6Everyday work, writing, balanced speed$3 in / $15 out per 1M tokens
Haiku 4.5Fast classification, summaries, high-volume$1 in / $5 out per 1M tokens
Mythos PreviewFrontier reasoning, cybersecurity, researchNot publicly listed

Claude Opus 4.7 launched April 16, 2026. It is Anthropic’s most capable generally available model. Improvements include stronger vision, more reliable long-horizon task execution, a new “xhigh” effort level, and a 13% improvement on Anthropic’s 93-task coding benchmark. It supports a 1 million token context window and up to 128K output tokens.

Claude Sonnet 4.6 is the practical workhorse. For most users writing memos, reviewing code, or drafting content, it is fast, accurate, and significantly cheaper than Opus. Many developers report it feels nearly as good as Opus 4.6 for routine tasks while costing far less.

Claude Haiku 4.5 is the speed tier. Released October 2025, it matches the original Sonnet 4’s coding performance at one-third the cost. Ideal for classification, extraction, and high-volume API pipelines.

Claude Mythos Preview arrived April 7, 2026, after a March leak. Internal documents called it a “step change” in capabilities. It is exceptionally strong at reasoning, coding, and cybersecurity. The UK AI Safety Institute confirmed continued improvement in capture-the-flag challenges and vulnerability discovery. Access is limited and not available through standard plans.

Claude Code: The Developer’s Agent

Claude Code is the biggest reason developers switched to Anthropic in 2026. It is a terminal-based agent that reads your entire codebase, writes and edits files, runs shell commands, and iterates on its own output.

Key features in mid-2026 include ultraplan cloud planning, the /loop self-pacing command, a monitor tool for resource awareness, managed agent memory that remembers your preferences across sessions, /autofix-pr for fixing pull requests, and /team-onboarding for packaging your setup.

On coding benchmarks, Opus 4.7 scores roughly 80.8% on SWE-bench Verified and 91.3% on GPQA Diamond. In a 30-day independent test by Ryz Labs, Claude achieved approximately 95% functional accuracy versus about 85% for ChatGPT. Claude Code costs $20/month on Pro, $100 to $200/month on Max plans, or per-token via the API.

Four Things Claude Can Do Now That It Could Not Do Six Months Ago

Computer Use. On March 23, 2026, Anthropic gave Claude the ability to control your computer. It opens apps, navigates browsers, clicks, types, and runs dev tools autonomously. Available in Claude Cowork and Claude Code for Pro, Max, and Team users.

The 1 Million Token Context Window. Since March 13, 2026, the 1M token context window is GA for Opus and Sonnet at standard pricing with no surcharge. You can hold entire codebases or full books in a single session.

Claude Cowork and Dispatch. Cowork hit GA on April 9, 2026, on macOS and Windows. Dispatch lets Claude run as a background agent, watching folders and processing files while you work on other things.

The Redesigned Desktop App. On April 14, 2026, Anthropic shipped a full rebuild of the Claude Code desktop app with parallel sessions, Git isolation, drag-and-drop layouts, integrated terminal, in-app file editing, and PDF/HTML preview.

What Claude Does Best

Claude’s strengths are specific and deep: writing and editing that preserves your voice, summarizing extremely long documents without losing nuance, code review that catches edge cases, architectural discussion that considers trade-offs, creating structured briefs and reports, reviewing arguments for hidden risks, working inside Artifacts and Projects for iterative creation, and turning raw notes into decisions.

If your task needs judgment, structure, and a careful tone, Claude is often the strongest option.

Artifacts and Projects: The Workspace Layer

Artifacts turns Claude’s substantial outputs (documents, code, diagrams) into interactive panels separate from chat. You iterate on the artifact directly instead of scrolling through history. In 2026, you can share artifacts with anyone, even without a Claude account.

Projects are self-contained workspaces with their own chat history, uploaded knowledge bases, and custom instructions. Pro and Team users use them for client-specific workspaces, brand-consistent content, and onboarding new members with pre-loaded context. Google Workspace integration connects Projects to live Docs and Gmail.

Constitutional AI

Constitutional AI is Anthropic’s training philosophy. Instead of relying solely on human raters, Anthropic writes a constitution of principles. The model critiques its own responses against those principles during training.

In practice, this is why Claude often sounds cautious. It flags uncertainty more openly and gives nuanced answers on sensitive subjects. But Constitutional AI is not a correctness guarantee. It does not eliminate hallucinations. It does not replace professional review. It is a training approach that shapes tone, not a warranty.

Claude Pricing (May 2026)

Pricing splits into two tracks: app subscriptions and API billing.

Subscriptions:

  • Free: $0, basic access
  • Pro: $20/month ($17/month with annual billing), all models, Projects, Artifacts
  • Max 5x: $100/month, 5x Pro usage
  • Max 20x: $200/month, 20x Pro usage
  • Team Standard: $25/seat/month ($20 annual), shared workspaces
  • Team Premium: $125/seat/month ($100 annual), Claude Code access
  • Enterprise: Custom, starts ~$20/user + usage, SSO and compliance

On May 6, 2026, Anthropic doubled Claude Code’s five-hour rate limits across Pro, Max, Team, and Enterprise plans.

API per 1M tokens: Opus 4.7 ($5 in / $25 out), Sonnet 4.6 ($3 in / $15 out), Haiku 4.5 ($1 in / $5 out). Cache writes are $6.25 (5-min) or $10 (1-hr). Cache hits are $0.50.

Note: Opus 4.7 uses an updated tokenizer that maps the same input to up to 1.35x more tokens than Opus 4.6. Headline rates are unchanged, but effective costs may be slightly higher.

Use Case Matrix

Use caseBest modelWhy
Blog or newsletter editingSonnet or OpusStrong tone control
Complex code reviewOpus 4.7Better edge-case reasoning
Quick daily codingSonnet 4.6Fast, cheap, capable enough
Contract or policy summaryOpus 4.7Long-document handling and risk framing
High-volume classificationHaiku 4.5$1/$5 per million tokens, fast
Research synthesisSonnet or OpusStrong source organization
UI prototypesSonnetArtifacts make iteration visual
Strategy memosOpus 4.7Multi-factor trade-offs
Agentic developmentClaude Code + Opus 4.7Self-pacing, memory, monitor tools

Prompt Examples

Better Writing:

Rewrite this draft for [audience]. Keep the meaning, improve clarity, remove hype, and make the tone human. Do not invent facts. Flag any claim that needs a source. Return the revised version, then a list of changes.

Document Review:

Analyze this document using only the text provided. Return: 1) Executive summary 2) Key obligations 3) Risks and unclear points 4) Questions for the author 5) Action checklist. Quote supporting phrases.

Code Review:

Review for correctness, security, edge cases, performance, and maintainability. List findings by severity. Explain causes. Suggest the smallest safe fix. Do not rewrite unrelated code.

Strategy:

Help me decide between these options. Context: [situation]. Goal: [goal]. Constraints: [budget, timeline, team, risk]. Options: [list]. Give a recommendation, trade-offs, risks, and first three actions.

Claude vs ChatGPT vs Gemini

Choose Claude for careful writing, long-document workflows, code review, agentic coding with Claude Code, Artifacts, and nuanced analysis.

Choose ChatGPT for OpenAI’s broad feature set: image generation, data analysis, custom GPTs, and the GPT-5.x model family. ChatGPT remains the most versatile all-in-one AI toolkit.

Choose Gemini when tied to Google Workspace, needing Google’s massive context and multimodal capabilities, or using Google Cloud.

Many professionals use more than one. Claude for writing and coding. ChatGPT for mixed workflows and images. Gemini for Google-ecosystem work.

Claude Mythos: What We Know

On March 26, 2026, documents leaked from Anthropic’s CMS revealing Claude Mythos, described internally as a “step change” in performance. On April 7, Anthropic officially announced the Claude Mythos Preview.

Mythos is not a product you can subscribe to. It is a preview model with limited access. Published evaluations show exceptional strength in reasoning, coding, and cybersecurity. Anthropic’s red team found it identified thousands of security bugs in legacy code that humans had missed for years. The UK AI Safety Institute confirmed continued improvement in real-world vulnerability discovery.

Mythos matters not because you can use it today, but because it signals where Anthropic is heading. If Opus 4.7 is the current ceiling, Mythos is the floor of the next generation.

FAQ

Is Claude Opus 4.7 available on the free plan? Free users get limited model access. Opus 4.7 is primarily available on Pro, Max, Team, and Enterprise plans. Check the current plan page for exact availability.

Can Claude use my computer to complete tasks? Yes. Computer Use launched March 2026. Available in Claude Cowork and Claude Code for Pro, Max, and Team subscribers.

What is Claude Code? A terminal-based agentic coding tool. It reads your codebase, writes and edits files, runs shell commands, and iterates on output. Built for development, not general conversation.

How much does Claude cost? Plans range from Free to $200/month (Max 20x). Pro is $20/month. Team starts at $25/seat. Enterprise is custom. API ranges from $1 to $25 per million tokens depending on model and direction.

What is Claude Mythos? Anthropic’s most advanced model, in limited preview since April 2026. Significant improvements in reasoning, coding, and cybersecurity. Not available through standard plans.

Does Claude hallucinate? Yes. Every large language model does. Always verify important claims, especially in professional, legal, medical, or financial contexts.

Can I use Claude for free? Yes, with limited access. The newest models and highest limits require a paid plan.

Common Mistakes to Avoid

  • Publishing old pricing without checking Anthropic’s current page.
  • Claiming benchmark results without the exact benchmark and date.
  • Presenting Claude as hallucination-free.
  • Uploading confidential documents without verifying your plan and policy.
  • Using Claude output as professional advice (legal, medical, financial) without expert review.
  • Padding content because the AI can generate more.

Troubleshooting Claude

  • Too cautious? Explain the legitimate context and ask for a practical answer.
  • Too verbose? Ask for a one-page brief or decision memo.
  • Misses document details? Ask it to quote the passages it used.
  • Code suggestions too broad? Ask for the smallest patch, no unrelated refactor.
  • Writing sounds generic? Provide a sample of your voice and ask it to match.

The Bottom Line

Claude in May 2026 is not the Claude of 2025. It is an ecosystem: a coding agent, a screen-controlling assistant, a collaborative workspace, and a model family covering everything from cheap classification to frontier reasoning.

Opus 4.7 is the model most users should know about. Sonnet 4.6 is the one most users should actually use. Mythos is the one to watch.

The right way to use any AI tool: provide real context, check current facts, protect sensitive data, and edit the output with human judgment. Claude makes good work faster. It should not make fake work look real.

Verified Sources