Create personal apps powered by AI models

Get started free
LLM ComparisonClaude 4.5 SonnetClaude 4.5 Haiku

Claude 4.5 Sonnet vs Claude 4.5 Haiku

Compare Claude 4.5 Sonnet and Claude 4.5 Haiku. Build AI products powered by either model on Appaca.

Model Comparison

FeatureClaude 4.5 SonnetClaude 4.5 Haiku
ProviderAnthropicAnthropic
Model Typetexttext
Context Window1,000,000 tokens200,000 tokens
Input Cost
$3.00/ 1M tokens
$1.00/ 1M tokens
Output Cost
$15.00/ 1M tokens
$5.00/ 1M tokens

Put these models to work for you

Create personal apps and internal tools powered by Claude 4.5 Sonnet, Claude 4.5 Haiku, and 20+ other AI models. Just describe what you need — your app is ready in minutes.

Strengths & Best Use Cases

Claude 4.5 Sonnet

Anthropic

1. Best-in-class coding performance

  • #1 on SWE-bench Verified (77.2% standard, 82.0% high-compute).
  • Excels at debugging, architecture, and multi-file code generation.
  • Maintains coherence for extremely long tasks (30+ hours).

2. State-of-the-art computer use & agents

  • Leads OSWorld at 61.4%.
  • Strongest model for agentic workflows, multi-step tool use, and real computer control.
  • Powering Claude Code, the new Claude Agent SDK, and Chrome agent actions.

3. Advanced reasoning & math

  • Large improvements across reasoning-heavy benchmarks (AIME, MMMLU, τ2-bench, Terminal-Bench).
  • Deep multi-step reasoning with extended or interleaved thinking.

4. High alignment & safety

  • Most aligned Claude model to date with reduced deception, hallucinations, sycophancy, and harmful compliance.
  • Strong protections against prompt injection for agentic tasks (ASL-3 safeguards).

5. Domain-expert performance

  • Notable gains in finance, law, medicine, and STEM tasks.
  • Trusted by early customers for long-context legal analysis, multi-file engineering, security research, and red-teaming.

Claude 4.5 Haiku

Anthropic

1. Frontier-level coding at small-model speed

  • Similar coding performance to Claude Sonnet 4 at one-third the cost.
  • Runs 4-5x faster than Sonnet 4.5 for many tasks.
  • Ideal for real-time pair programming, prototyping, and rapid iteration.

2. Excellent computer-use abilities

  • Surpasses Claude Sonnet 4 in certain computer-control tasks.
  • Great for agents requiring low-latency tool use (Chrome automation, coding agents, etc.).

3. Perfect for real-time, low-latency applications

  • Chat assistants
  • Customer support agents
  • Interactive development loops
  • Multi-agent orchestration

4. Works seamlessly with Sonnet 4.5 in hybrid agent setups

  • Sonnet 4.5 plans complex workflows.
  • Haiku 4.5 executes subtasks in parallel for speed and cost-efficiency.

5. High alignment & safest Claude model by metric

  • Lower misaligned behavior rates than Haiku 3.5, Sonnet 4.5, and Opus 4.1.
  • Limited CBRN risk → released under AI Safety Level 2 (ASL-2).

Ready to put Claude 4.5 Sonnet or Claude 4.5 Haiku to work?

Create personal apps and internal tools on Appaca in minutes. No coding required.

The platform for your ideal software

Use Appaca to to do the most with any software you need, just for your use case.