Claude Sonnet 4.5
The previous-generation Sonnet flagship — excellent coding and agent capabilities. A great fit for teams with tight budgets that still need high-quality code output; the industry benchmark before 4.6.
Context window
200K
tokens
Max output
8K
tokens
Input price
$0.429 金币
/ 1M tokens
Output price
$2.143 金币
/ 1M tokens
Core capabilities
Code generation
Chain-of-thought reasoning
Vision understanding
Long context
Prompt caching
Recommended use cases
Everyday programming assistant
Code refactoring
API design
Quick start
Replace base_url and api_key below with your own to call Claude Sonnet 4.5. Fully OpenAI SDK compatible — no other code changes needed.
curl https://api.piomodel.com/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer sk-your-key" \
-d '{
"model": "claude-sonnet-4-5",
"messages": [{"role": "user", "content": "Hello"}]
}'Other Anthropic models
FAQ
Q: How is Claude Sonnet 4.5 priced?
A: Pay per token: $0.429 金币/M input, $2.143 金币/M output. No monthly fee, no minimum spend. Credits never expire.
Q: How do I integrate Claude Sonnet 4.5? Any code changes?
A: Fully OpenAI-compatible — just swap base_url and api_key. Claude models also support the native Anthropic /v1/messages format. See the code snippets above.
Q: Is Claude Sonnet 4.5 stable through PioModel?
A: All requests go through our API gateway (api.piomodel.com) with optimized third-party backbone routing. Average latency under 200ms, reliable under any network condition.
Q: What use cases does Claude Sonnet 4.5 support?
A: Recommended: Everyday programming assistant、Code refactoring、API design. Compare with other models from the same provider for your specific needs.
Q: Does Claude Sonnet 4.5 have a free tier?
A: New users get free credits after email verification, ready for immediate API testing. Top up from $10 afterwards, pay as you go.
Get started with Claude Sonnet 4.5
Free credits on sign-up. Pay as you go. $10 minimum top-up, no expiration.