🤖 Model Analysis

Claude Models: Deep Dive

Every Claude model — benchmarked, compared, and explained. Find out exactly which model is right for your task and budget.

⚡ Claude Haiku 4.5
⚡ Fastest Model
Claude Haiku 4.5
The speed champion. Haiku is designed for tasks where response time and cost matter more than raw intelligence. It's surprisingly capable for its size.
~1s
Response Time
$
Cost Tier
200K
Context Window
Best for
High-volume tasks

Performance Ratings

Speed
9.8
Cost
9.5
Reasoning
6.8
Writing
7.4
Coding
7.0

Best Used For

Customer support chatbots Real-time autocomplete Content classification Simple Q&A Text summarisation Data extraction High-volume API calls Translation

Avoid For

Complex multi-step reasoning Deep research Advanced code generation Nuanced creative writing

✅ Strengths

  • ✓ Extremely fast — near-instant responses
  • ✓ Lowest cost per token — great for scaling
  • ✓ Same 200K context window as bigger models
  • ✓ Solid at structured tasks and classification
  • ✓ Great for production apps needing speed

    • ⚠️ Limitations

  • ✗ Less nuanced than Sonnet or Opus
  • ✗ Can miss subtleties in complex prompts
  • ✗ Weaker at multi-step logic chains
  • ✗ Creative writing is functional but not inspired
    • 💡

    Pro Tip: Use Haiku when building apps where you need to call Claude many times (like per-message in a chat app). The cost savings vs Sonnet can be 10x at scale.

    ⭐ Claude Sonnet 4.5
    ⭐ Most Popular
    Claude Sonnet 4.5
    The sweet spot. Sonnet delivers 80% of Opus's capability at a fraction of the cost and with much faster responses. It's the right choice for most people most of the time.
    ~3s
    Response Time
    $$
    Cost Tier
    200K
    Context Window
    Best for
    Most everyday tasks

    Performance Ratings

    Speed
    7.8
    Cost
    7.5
    Reasoning
    8.7
    Writing
    9.0
    Coding
    8.8

    Best Used For

    Blog posts & articles Code generation Email drafting Data analysis Research summaries Marketing copy Document drafting Debugging code Business strategy

    When to Upgrade to Opus

    PhD-level research Complex legal analysis Advanced mathematical proofs

    ✅ Strengths

  • ✓ Excellent writing quality — natural and nuanced
  • ✓ Strong coder — handles complex functions well
  • ✓ Good at following complex multi-part instructions
  • ✓ Much cheaper than Opus for similar quality
  • ✓ Available on free tier (with limits)

    • ⚠️ Limitations

  • ✗ Can struggle with very long multi-hop reasoning
  • ✗ Less thorough on highly technical expert topics
  • ✗ Occasionally misses subtle nuances Opus catches
    • 💡

    Pro Tip: For 90% of everyday tasks — writing, coding, research, emails — Sonnet is your model. Start here and only upgrade to Opus if the output isn't meeting your needs.

    👑 Claude Opus 4
    👑 Most Powerful
    Claude Opus 4
    The flagship. Opus 4 is the most intelligent Claude model available — capable of deep reasoning, nuanced analysis, and tackling tasks that would trip up other models. Use it when quality matters more than speed or cost.
    ~8s
    Response Time
    $$$
    Cost Tier
    200K
    Context Window
    Best for
    Complex, critical tasks

    Performance Ratings

    Speed
    4.8
    Cost
    3.0
    Reasoning
    9.7
    Writing
    9.6
    Coding
    9.5

    Best Used For

    Complex research & analysis Advanced coding projects Legal document review Scientific literature analysis Long-form professional writing Multi-step strategy planning Financial modelling Medical information review

    Overkill For

    Simple Q&A Basic emails Short summaries High-volume automation

    ✅ Strengths

  • ✓ Best-in-class reasoning and logic
  • ✓ Exceptional at long, complex documents
  • ✓ Most nuanced and thoughtful writing
  • ✓ Handles ambiguous instructions better than any model
  • ✓ Superior at understanding context and intent

    • ⚠️ Limitations

  • ✗ Slowest of all Claude models
  • ✗ Most expensive — not practical for high-volume use
  • ✗ Not available on free tier
  • ✗ Often overkill for simple tasks
    • 📊 Side-by-Side

    Full Comparison Table

    Every metric at a glance.

    Feature⚡ Haiku 4.5⭐ Sonnet 4.5👑 Opus 4
    Best ForSpeed & volumeMost everyday tasksComplex, critical work
    Response SpeedVery FastFastModerate
    Relative CostLowestMidHighest
    Context Window200K tokens200K tokens200K tokens
    Reasoning Quality⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐
    Writing Quality⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐
    Coding Quality⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐
    Free Tier✅ Yes (limited)✅ Yes (limited)❌ Pro only
    API Access✅ Yes✅ Yes✅ Yes
    Vision / Images✅ Yes✅ Yes✅ Yes
    Ideal UserDevelopers, app buildersProfessionals, creatorsResearchers, enterprises
    ⚠️ Note on pricing: Exact token prices change over time. Always check anthropic.com/pricing for the latest rates before building or budgeting.
    🤔 Decision Guide

    Which Model Should You Use?

    Answer these questions to find your ideal model.

    1. What's your primary concern?
    →Speed and low cost (e.g. building an app with many calls) → Haiku
    →Balanced quality and cost (everyday tasks) → Sonnet
    →Maximum intelligence (cost isn't a concern) → Opus
    2. What kind of task is it?
    →Simple: summarise, classify, answer a FAQ → Haiku
    →Medium: write an article, debug code, draft a proposal → Sonnet
    →Hard: analyse 100-page legal doc, build complex system, PhD-level research → Opus
    3. Still unsure?
    →Start with Sonnet — it handles most tasks excellently and is available on the free tier. Upgrade to Opus only if the output doesn't meet your needs.

    Ready to try these models yourself?

    Start with the free tier on claude.ai — Haiku and Sonnet are both available.

    ✦ Try Claude Free Learn to Prompt Better →