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Anthropic

Claude 4.5 family - Opus Sonnet Haiku

Usage-basedLLM APIsLast verified: 2026-01-18

Overview

Anthropic's Claude 4.5 model family with 200K context window. Opus 4.5 ($5/$25 per MTok) is the most intelligent for agents and coding. Sonnet 4.5 ($3/$15 per MTok) offers optimal balance of intelligence, cost, and speed. Haiku 4.5 ($1/$5 per MTok) is fastest and most cost-efficient. Features prompt caching, batch processing (50% off), web search ($10/1K searches), and code execution. Legacy models (Opus 4.1, Sonnet 4, Haiku 3) also available.

Works with

REST API

Pricing

$1/$5 per MTokHaiku 4.5

Fastest model
Most cost-efficient
200K context
Prompt caching: $1.25 write / $0.10 read

MOST POPULAR

$3/$15 per MTokSonnet 4.5

Balanced intelligence and speed
Great for coding
200K context
$6/$22.50 for prompts >200K tokens
Prompt caching: $3.75 write / $0.30 read

$5/$25 per MTokOpus 4.5

Most intelligent model
Best for agents and complex reasoning
200K context
Prompt caching: $6.25 write / $0.50 read

50% offBatch Processing

All models supported
Async workloads
Better efficiency

Pros

+Excellent at coding
+200K context window
+Strong safety and alignment
+Prompt caching available
+50% batch discount

Cons

-Smaller ecosystem than OpenAI
-Web search costs extra ($10/1K)

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