Claude Sonnet 4.5

Sep 2025
Retires Nov 30, 2026Move toClaude Sonnet 5.5Newer version
Claude Sonnet 4.5
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$0.56per task?
$3 / $15per 1M in / outcache $0.30
52 tok/sfirst token in 12 s?
1Mcontext

Alternatives?

History

7 versions
0204060Jul 25Oct 25Jan 26Release dateARC-AGI-2 · Semi-private44.54.6
0204060Jul 25Oct 25Jan 26Release dateARC-AGI-2 · Semi-private44.54.6

Benchmarks

in Chat & Knowledge
AIME 2025lab87
HMMT 2025 chart edition unstatedlab79.2
MMLU-Pro · official boardlab87.4

FAQ

How much does Claude Sonnet 4.5 cost?›

$3 per 1M input tokens and $15 per 1M output tokens; cached input $0.30 per 1M. A typical benchmark task costs about $0.56 at default effort.

Is Claude Sonnet 4.5 free to use?›

There is no free API; the cheapest paid price is $3 per 1M input tokens.

How good is Claude Sonnet 4.5, and what is it best at?›

#132 of 334 in Chat & Knowledge, #75 of 132 in Coding, #70 of 133 in Agents & Tool Use, #21 of 195 in Writing & Language, #75 of 124 in Vision & Documents. Strongest at: Knowledge.

Is Claude Sonnet 4.5 better than GPT-5.1?›

On ARC-AGI-2 · semi-private, Claude Sonnet 4.5 scores 13.6 vs 17.6 — lower.

How can I use Claude Sonnet 4.5?›

Through the API of Amazon Bedrock, Anthropic, Azure, Claude Platform on AWS, Google.

What is the context window of Claude Sonnet 4.5?›

1M tokens, with up to 64K output tokens.

When was Claude Sonnet 4.5 released? Is there a newer version?›

Released 2025-09-29. It has been superseded by Claude Sonnet 5.5.

Is Claude Sonnet 4.5 open source?›

No, Claude Sonnet 4.5 is a closed model available through an API. The closest open-weights option here is GLM 5.3 Flash.

Can Claude Sonnet 4.5 read images?›

It accepts text and images, PDF files as input.

What is Claude Sonnet 4.5?›

Claude Sonnet 4.5 is a closed language model from Anthropic, released Sep 2025.

What are the best alternatives to Claude Sonnet 4.5?›

GPT-6.1 Sol (cheaper), GPT-6 Luna (better), GLM 5.3 Flash (open weights).