Available now
Anthropic
claude-sonnet-5
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...
TextReasoningToolsFilesVision1MCacheComputerUse
Input$0.23/ 1M
Output$1.13/ 1M
Endpointsanthropic, openai
Capabilities
ReasoningToolsVisionFilesCacheStructuredComputer use
Modalities
Input
textimagefile
Output
text
Quick stats
Context window1M
Max output128K
Modechat
TokenizerClaude
ModeratedYes
Reasoning levels
max
Performance
Loading performance data...
Supported parameters
| Parameter | Always | Default |
|---|---|---|
| frequency_penalty | - | (do not send) |
| include_reasoning | - | |
| max_completion_tokens | - | - |
| max_tokens | - | |
| presence_penalty | - | (do not send) |
| reasoning | - | |
| repetition_penalty | - | (do not send) |
| response_format | - | |
| stop | - | |
| structured_outputs | - | - |
| temperature | - | (do not send) |
| tool_choice | - | |
| tools | - | |
| top_k | - | (do not send) |
| top_p | - | (do not send) |
| verbosity | - |
§ 01
Pricing
| Input price | $0.23 · 1M tokens |
| Output price | $1.13 · 1M tokens |
| Compatible endpoints | anthropic, openai |
| Vendor | Anthropic |
§ 02
Call claude-sonnet-5 from your code
Point any OpenAI-compatible SDK at UnoRouter and request the model by name. Replace YOUR_API_KEY with a real key from your dashboard.
bash
curl https://api.unorouter.com/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-sonnet-5",
"messages": [{"role": "user", "content": "Hello!"}]
}'§ 03
Frequently asked questions
How much does claude-sonnet-5 cost per 1M tokens?
Input is priced at $0.23 per 1M tokens, output at $1.13 per 1M tokens. Billing is per token, no rounding to batch sizes.
How do I access claude-sonnet-5 via API?
Send requests to the UnoRouter /v1/chat/completions endpoint with model=claude-sonnet-5. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.
§ 04
Similar models
Try claude-sonnet-5 now
Create an API key and start making requests in under a minute.