What is the context window of Claude Sonnet 4.5?

Claude Sonnet 4.5 has a context window of 200K tokens.

How much does Claude Sonnet 4.5 cost?

Claude Sonnet 4.5 pricing ranges from $3/1M to $9.0/1M input tokens depending on the provider.

When was Claude Sonnet 4.5 released?

Claude Sonnet 4.5 was released on 2025-09-29.

What benchmarks has Claude Sonnet 4.5 been tested on?

Claude Sonnet 4.5 has been evaluated on 3 benchmarks, including Massive Multi-discipline Multimodal Understanding, BFCL, MMLU PRO.

Claude Sonnet 4.5

Name: Claude Sonnet 4.5
Author: Anthropic

claude-sonnet-4-5

Researched 29d ago

Last refreshed 2026-05-16. Next refresh: weekly.

MultimodalRAGAgentsLong contextVisionClassificationJSON / Tool useHighlight

Claude Sonnet 4.5 is worth evaluating for rag, agents, and long context when its provider route and context window match the workload.
Decision context: Vision task fit, 7 tracked provider routes, and research from 2026-04-19.

Use it for

Teams evaluating rag, agents, and long context
Workloads that can use a 200K context window
Buyers comparing 4 tracked provider routes

Do not use it for

Workloads where another current model has stronger sourced task evidence

Cheapest output

$15.00

Anthropic per 1M tokens

Provider routes

Tracked API hosts

Quality / dollar

Grade D

Ranked by benchmark score divided by cheapest output price

Freshness

2026-04-19

Researched 29d ago

fresh

Top use-case fit

RAG

Included by capability and metadata signals in the decision map.

Agents

Included by capability and metadata signals in the decision map.

Long context

Included by capability and metadata signals in the decision map.

Provider price ladder

Compare all 7

Provider	Input / 1M	Output / 1M	Batch in / out	Cache	Route
Anthropic	$3.00	$15.00	$1.50 / $7.50	-	Serverless
GCP Vertex AI	$3.00	$15.00	-	-	Serverless
Microsoft Foundry	$3.00	$15.00	-	read $0.300 / 5m $3.75 / 1h $6.00	ServerlessProvisioned
OpenRouter	$3.00	$15.00	-	-	Serverless

Benchmark peer barsfor Vision

Massive Multi-discipline Multimodal UnderstandingRank 15 of 38

Qwen3.6-Plus

86.0

ByteDance Doubao Seed 2.0 Pro

85.4

Qwen3.5-397B-A17B

85.0

Kimi K2.5

84.3

Claude Sonnet 4.5current

77.8

Migration checks

No linked migration route is available for this model yet.

About

Claude Sonnet 4.5 available on AWS Bedrock

Claude Sonnet 4.5 has a 200K-token context window.

Claude Sonnet 4.5 input tokens at $3/1M, output at $15/1M.

Capabilities

VisionMultimodalReasoningFunction CallingTool UseStructured Outputs

Benchmark Scores(3)

Scores are benchmark-specific and are direction-aware: the same numeric gap can mean very different outcomes across suites. Use the leaderboard context and this model's provider route to decide whether the winning margin is meaningful for your workload.

Benchmark	Score	Version	Source
Massive Multi-discipline Multimodal Understanding	77.8	—	https://mmmu-benchmark.github.io/
BFCL	73.2	—	https://gorilla.cs.berkeley.edu/leaderboard.html
MMLU PRO	86.0	—	https://huggingface.co/spaces/TIGER-Lab/MMLU-Pro