anthropic

Anthropic: Claude Sonnet 4.5

This AI model, Claude Sonnet 4.5 from Anthropic, supports input in three formats: text, image, and file. It can process extremely long contexts, with a maximum limit of one million characters. The model also offers tools and reasoning capabilities. However, it does not produce structured output. The price point for this model is $3.0 per million input tokens and $15.0 per million output tokens. Its benchmark standing is a blended score of 56.2 across two independent assessments. Although its coverage on the benchmarks is limited to only two, those who may consider shortlisting it include users who require handling multiple modalities or need high context lengths. Despite its higher cost, it might be a suitable choice for organizations with specific requirements that align with this model's capabilities.

Quality Score
100/100
price + capability + benchmarks
Input Price
$3.00
per 1M tokens · checked 2026-09-10
Output Price
$15.00
per 1M tokens · checked 2026-09-10
Context Window
1,000,000
tokens

Benchmark results

Independent, published benchmarks. Blended score 56.2 across 2 benchmarks, last refreshed 2026-09-10. How scoring works →

BenchmarkMeasuresScore
AI Index broad capability composite 31.9
EQ-Bench emotional understanding in dialogue 72.2
Model ID
anthropic/claude-sonnet-4.5
Vendor
anthropic
Released
September 2025
Tokenizer
Claude
Input Modalities
text, image, file
Output Modalities
text
Max Output
64,000 tokens
Tool Calling
✓ supported
Structured Output
✓ supported
Reasoning Mode
✓ supported
Vision
✓ accepts images
Audio
no
Moderated
yes

What it costs in practice

Computed from the current $3.00/M input and $15.00/M output rates. Run your own numbers →

JobTokensCost
Summarize a 50-page report 30k in / 1.5k out $0.11
Classify 1,000 customer emails 500k in / 50k out $2.25
A month of a busy support chatbot 5M in / 2M out $45.00

Category rankings

Where Anthropic: Claude Sonnet 4.5 places across the 4 categories it ranks in. How we rank →

#CategoryScore
#24 Code RefactoringCode · of 25 ranked 150
#24 Transcript CleanupWriting · of 25 ranked 140
#24 RAG PipelinesAgents · of 25 ranked 150
#24 Long-Context Q&AAgents · of 25 ranked 146

Similar models

Quick answers

How much does Anthropic: Claude Sonnet 4.5 cost?
$3.00 per million input tokens and $15.00 per million output tokens.
What is Anthropic: Claude Sonnet 4.5's context window?
1,000,000 tokens, roughly 1,500 pages of text in a single request.
Does Anthropic: Claude Sonnet 4.5 support tool calling?
It supports tool calling, structured output, a reasoning mode.
Can Anthropic: Claude Sonnet 4.5 process images?
Yes, it accepts image input.