Claude Sonnet 4 vs Claude Sonnet 4.5

Compare Anthropic and Anthropic AI models

Anthropic

Claude Sonnet 4

Anthropic

Claude Sonnet 4.5

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Cost Comparison (1000 input + 500 output tokens, 100 requests/day)

Claude Sonnet 4

Per Request:$0.0105

Daily:$1.05

Monthly:$31.50

Yearly:$383.25

Claude Sonnet 4.5

Per Request:$0.0105

Daily:$1.05

Monthly:$31.50

Yearly:$383.25

Cost Differences

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Claude Sonnet 4.5 costs less than Claude Sonnet 4

Feature Comparison

Feature	Claude Sonnet 4	Claude Sonnet 4.5
Provider	Anthropic	Anthropic
Input Price	$3.00/1M tokens	$3.00/1M tokens
Output Price	$15.00/1M tokens	$15.00/1M tokens
Context Window	200,000 tokens	200,000 tokens
Max Output	64,000 tokens	64,000 tokens
Category	standard	balanced
Capabilities	textvisioncodereasoning	textvisioncode
Release Date	5/14/2025	9/29/2025

Claude Sonnet 4 vs Claude Sonnet 4.5: Which Should You Choose?

Choosing between Claude Sonnet 4 and Claude Sonnet 4.5 depends on your priorities: cost efficiency, context length, or raw capability. Claude Sonnet 4.5 is the more affordable option at $3.00/1M input tokens.

These models target different tiers: Claude Sonnet 4 is a standard model while Claude Sonnet 4.5 is balanced. This means they're optimized for different workloads. Claude Sonnet 4.5 targets more demanding workloads, while Claude Sonnet 4 provides a cost-effective option for everyday tasks.

Output costs matter too. Claude Sonnet 4 charges $15.00/1M output tokens vs $15.00 for Claude Sonnet 4.5.

Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.

Best Use Cases

Choose Claude Sonnet 4 when:

• You need more capabilities (reasoning)
• You're already using Anthropic's API ecosystem

Choose Claude Sonnet 4.5 when:

• You're already using Anthropic's API ecosystem

Try Different Scenarios

Use the calculator below to see how costs change with different usage patterns

Claude Sonnet 4 (Anthropic)

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Claude Sonnet 4.5 (Anthropic)

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Frequently Asked Questions

Which is cheaper, Claude Sonnet 4 or Claude Sonnet 4.5?▼

Claude Sonnet 4.5 is cheaper for input tokens at $3.00 per million tokens vs $3.00 for Claude Sonnet 4.

What is the context window difference between Claude Sonnet 4 and Claude Sonnet 4.5?▼

Claude Sonnet 4 supports 200,000 tokens while Claude Sonnet 4.5 supports 200,000 tokens — a difference of 0 tokens in favor of Claude Sonnet 4.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, Claude Sonnet 4.5 is the lower-cost option, while Claude Sonnet 4 offers a larger context window (200,000 vs 200,000 tokens). Choose Claude Sonnet 4.5 for budget sensitivity or Claude Sonnet 4 for longer context tasks.

Which model has better overall pricing for heavy usage?▼

At 100 requests/day with 1,000 input and 500 output tokens each, Claude Sonnet 4 costs about $31.50/month and Claude Sonnet 4.5 costs about $31.50/month. Overall, Claude Sonnet 4.5 has lower combined input + output rates ($3.00 in, $15.00 out) vs Claude Sonnet 4.