Claude Sonnet 4.5

Sep 2025
Retires Nov 30, 2026Move toClaude Sonnet 5.5Newer version
Claude Sonnet 4.5
Compare in
on
—per task?
$3 / $15per 1M in / outcache $0.30
—output speed?
1Mcontext

Rankingat enabled effort?

Alternatives?

Benchmarks

all categories
Chat & Knowledge
MMLU-Pro · official boardlab87.4
AIME 2025lab87
HMMT 2025 chart edition unstatedlab79.2
Coding
Terminal Bench 2.0lab42.8
SWE Verifiedlab77.2
Codeforces Ratinglab1,480
Agents & Tool Use
Tau2-Benchlab84.7
MCP-Universelab46.5
MCP-Marklab33.3
Tool-Decathlonlab38.6
HLE without toolslab13.7

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.

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 Gemini 3.1 Pro Preview?›

On τ³-bench · banking · 1.0.1, Claude Sonnet 4.5 scores 25.3 vs 26 — about the same.

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 It has been superseded by Claude Sonnet 5.5.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 Kimi K3.

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?›

Grok 4.5 (cheaper), Kimi K3 (open weights).