Claude Haiku 4.5 vs Claude Sonnet 4.5 Comparison

Comparing Claude Haiku 4.5 and Claude Sonnet 4.5 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Claude Haiku 4.5 outperforms in 0 benchmarks, while Claude Sonnet 4.5 is better at 5 benchmarks (AIME 2025, GPQA, MMMLU, OSWorld, Terminal-Bench).

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Sat Mar 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Haiku 4.5 costs less

For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 3.0x cheaper than Claude Sonnet 4.5 ($3.00/1M tokens).

For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 3.0x cheaper than Claude Sonnet 4.5 ($15.00/1M tokens).

In conclusion, Claude Sonnet 4.5 is more expensive than Claude Haiku 4.5.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers

Sat Mar 14 2026 • llm-stats.com

Claude Haiku 4.5

Input tokens$1.00

Output tokens$5.00

Best providerAnthropic

Claude Sonnet 4.5

Input tokens$3.00

Output tokens$15.00

Best providerAnthropic

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Context Window

Maximum input and output token capacity

Both models have the same input context window of 200,000 tokens. Both models can generate responses up to 64,000 tokens.

Claude Haiku 4.5

Input200,000 tokens

Output64,000 tokens

Claude Sonnet 4.5

Input200,000 tokens

Output64,000 tokens

Sat Mar 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Haiku 4.5 and Claude Sonnet 4.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Haiku 4.5

Text

Images

Audio

Video

Claude Sonnet 4.5

Text

Images

Audio

Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Haiku 4.5

Proprietary

Closed source

Claude Sonnet 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Haiku 4.5 was released on 2025-10-15, while Claude Sonnet 4.5 was released on 2025-09-29.

Claude Haiku 4.5 is 1 month newer than Claude Sonnet 4.5.

Claude Haiku 4.5

Oct 15, 2025

5 months ago

2w newer

Claude Sonnet 4.5

Sep 29, 2025

5 months ago

Knowledge Cutoff

When training data ends

Claude Haiku 4.5 has a knowledge cutoff of 2025-02-01, while Claude Sonnet 4.5 has a cutoff of 2025-01-31.

Claude Haiku 4.5 has more recent training data (up to 2025-02-01), making it potentially better informed about events through that date compared to Claude Sonnet 4.5 (2025-01-31).

Claude Haiku 4.5

Feb 2025

1 mo newer

Claude Sonnet 4.5

Jan 2025

Provider Availability

Claude Haiku 4.5 is available from Anthropic. Claude Sonnet 4.5 is available from Anthropic. The availability of providers can affect quality of the model and reliability.