Last refreshed 2026-07-26. Next refresh: weekly.
Why use Claude Sonnet 4.5 on Anthropic?
Anthropic offers Claude Sonnet 4.5 with pay-as-you-go pricing at $3.00/1M input tokens. Anthropic is a safety-focused AI research company and creator of the Claude model family, offering API access through the Anthropic Console for text generation, analysis, and coding tasks.
Compare Claude Sonnet 4.5 across 8 providers to find the best fit for your use caseInput / 1M
$3.00
Output / 1M
$15.00
Cache
Not sourced
Batch
-50% · in $1.50 / out $7.50
Setup recipe
Python + curlInstall
pip install anthropicAuth
export ANTHROPIC_API_KEY=...Call
import anthropic
client = anthropic.Anthropic() # reads ANTHROPIC_API_KEY from env
message = client.messages.create(
model="claude-sonnet-4-5",Model ID
claude-sonnet-4-5Request example
import anthropic
client = anthropic.Anthropic() # reads ANTHROPIC_API_KEY from env
message = client.messages.create(
model="claude-sonnet-4-5",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello"}]
)
print(message.content[0].text)Gotchas
- Use the versioned model ID, e.g. "claude-sonnet-4-6" or "claude-opus-4-7-20251101".
- The examples expect ANTHROPIC_API_KEY; rename it only if your application config maps the new variable.
Compare Claude Sonnet 4.5 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Microsoft Foundry | $3.00 | $15.00 |
| Anthropic | $3.00 | $15.00 |
| Snowflake Cortex | — | — |
| GCP Vertex AI | $3.00 | $15.00 |
| AWS Bedrock | $9.00 | $45.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $3.00 |
| Output tokens | $15.00 |
Capabilities
VisionMultimodalReasoningJSON / Tool useStructured Outputs
About Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic's Claude 4.5 model with multimodal text and image input and an optional reasoning mode. It offers a 200K-token context window and scores 86 on MMLU PRO.
Get Started
Model Specs
Released2025-09-29
Context200k
ArchitectureDecoder Only
Knowledge cutoff2025-12