Earlier generation
Haiku & Sonnet 4.5
Haiku and Sonnet 4.5 provide historical context for earlier lightweight, writing and coding workflows.
One Model Family · One Curated Home
Claude on GlobalGPT
Use Claude Fable 5.1 for demanding reasoning, Opus 5.5 for complex coding and knowledge work, Sonnet 5.5 for everyday balance, or Haiku 5.5 for fast everyday tasks. Explore practical guides and prompts for your task.
Curated by GlobalGPT Review Team
Choose Your Starting PointClaude Opus 5.5
Anthropic’s Claude Models, Together in GlobalGPT.
GlobalGPT is a multi-model subscription workspace. Claude model access here is separate from a Claude.ai subscription, Claude Code and Anthropic API billing; available tools and limits depend on the route you use.
4Model Starting Points
6Guide Topics
4Prompt & Workflow Paths
A Selected Path Through the Claude Family.
Selected generations for context. Opus 5.5, Sonnet 5.5 and Haiku 5.5 update the current choices, while Fable 5.1 remains an option for demanding reasoning.
Earlier generation
Sonnet & Opus 4.6
Background for older coding and document workflows.
Earlier generation
Sonnet 5
The earlier Sonnet option for writing, analysis and coding.
Earlier generation
Opus 5
The earlier Opus option for complex reasoning and coding.
Demanding reasoning
Fable 5.1
A current option for demanding reasoning and long-horizon agentic work.
Claude 5.5 generation
Opus, Sonnet & Haiku 5.5
Haiku 5.5 joins Opus 5.5 and Sonnet 5.5 with a fast option for classification, extraction and concise summaries.
Official source ↗Fable, Sonnet, Opus or Haiku: Choose Your Starting Point.
Choose Fable 5.1 for demanding reasoning, Opus 5.5 for complex work, Sonnet 5.5 for everyday balance, or Haiku 5.5 for fast everyday tasks.
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Demanding reasoning
Claude Fable 5.1
Choose Fable 5.1 for demanding reasoning and extended agentic work, especially when other Claude routes fall short on your task. Supply source material, constraints and acceptance checks.
Everyday balance
Claude Sonnet 5.5
A balanced option for writing, document analysis and coding. Anthropic positions Sonnet 5.5 around speed and intelligence; check the result against your sources and tests.
Coding & knowledge work
Claude Opus 5.5
A starting point for complex coding and knowledge work. Anthropic recommends Opus 5.5 for most workloads; assess the quality, cost and review effort on your own task.
Fast everyday tasks
Claude Haiku 5.5
A fast, efficient option for classification, structured extraction, concise summaries and everyday tasks. Provide clear output requirements and check important details against your source.
Earlier Models & Additional OptionsHaiku 4.5, Sonnet 5, Opus 5, Fable 5, Opus 4.8 and Sonnet 4.6
Claude Fable 5Earlier generation retained for existing workflows and comparisons./home/claude-fable-5?inviter=hub_research_claude&login=1
Claude Opus 4.8Earlier generation retained for existing workflows and comparisons./home/claude-opus-4-8?inviter=hub_research_claude&login=1
Claude Sonnet 4.6Earlier generation retained for existing workflows and comparisons./home/claude-sonnet-4-6?inviter=hub_research_claude&login=1
Claude Sonnet 5Earlier model · Listed on GlobalGPTThe earlier Sonnet 5 option, retained for existing writing, analysis and coding workflows./home/claude-sonnet-5?inviter=hub_research_claude&login=1
Claude Opus 5Earlier model · Listed on GlobalGPTThe earlier Opus 5 option, retained for existing workflows and historical comparisons./home/claude-opus-5?inviter=hub_research_claude&login=1
Claude Haiku 4.5Earlier model · Available on GlobalGPTAn earlier Haiku option for short drafts, classification and structured extraction when you can check the result quickly./home/claude-haiku-4-5?inviter=hub_research_claude&login=1
Choose by Complexity and the Cost of a Wrong Answer.
Compare Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5 by the work you need to do. These are editorial starting points, not benchmark scores.
| Model | Starting Point | Typical Work | What to Check |
|---|---|---|---|
| Claude Fable 5.1Anthropic | Demanding reasoning | Difficult reasoning and long-horizon agentic work | Source fidelity, constraints and tests |
| Claude Haiku 5.5Anthropic | Fast everyday tasks | Classification, structured extraction, concise summaries | Edge cases and correction time |
| Claude Sonnet 5.5Anthropic | Everyday balance | Writing, document analysis and coding | Sources, constraints and tests |
| Claude Opus 5.5Anthropic | Coding & knowledge work | Complex coding and professional workflows | Retries and review effort |
Find the Guide That Matches Your Next Step.
Browse access, current and earlier models, documents, coding, creative workflows and privacy. Each article has one primary category.
Understand subscription routes and billing.
Give Claude the Context It Needs.
Use the linked templates and worked examples. Supply your own source material, constraints and acceptance checks.
Writing
Define the audience, preserve approved facts and specify the reader’s next action.
12 Claude Prompt TemplatesWriting & Long-Document WorkflowDocuments
Extract a fact sheet, identify conflicting versions and ask for supporting passages before drafting.
Build a Source-First DocumentEvidence & Accuracy
Connect claims to sources and separate missing information from confident guesses.
Source-Based Prompt TemplatesCheck Privacy and Answer AccuracyCoding
Provide expected behavior and tests; distinguish reasoning from executed checks.
Coding Prompt TemplatesSend Your First Claude API RequestStart With a Tool Built for Your Task.
Summarize text, draft an email, work through code or review PDF excerpts. These GlobalGPT tools offer Claude models and task-specific presets; check each tool’s input requirements.
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01Claude Text Summarizer
Turn articles, reports and meeting notes into concise summaries, key points and action items. Paste your source text and check important details before sharing.
GlobalGPT
02Claude Email Writer
Draft emails, replies and follow-ups from your brief. Set the tone, preserve the facts and review the message before sending it yourself.
GlobalGPT
03Claude Coding Assistant
Paste code for explanations, debugging suggestions, refactoring ideas and test drafts. This is text-based assistance, not Claude Code or a code execution environment.
GlobalGPT
04Claude PDF Text Summarizer
Summarize text copied or extracted from a PDF. Keep supplied page labels and check the source; this tool does not upload or read PDF files directly.
GlobalGPT
Read the Evidence Behind the Guidance.
Anthropic publishes model and policy information. GlobalGPT guides provide editorial workflows and explicitly scoped tests.
Official Anthropic
Claude Models OverviewCurrent model lineup, capabilities and selection guidance.Claude Fable 5.1 and Mythos 5.1Official release and access distinctions.Anthropic Privacy PolicyRead the terms for the product and access route you use.Introducing Claude Haiku 5.5Official release, task fit and the distinction between model capabilities and platform access.Bring Your Next Draft, Document or Coding Question.
Start with Claude Fable 5.1 for demanding reasoning, or choose Opus 5.5, Sonnet 5.5 or Haiku 5.5 for your task.