Claude Sonnet 5.5
anthropic/claude-sonnet-5.5Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features and fixing bugs, with a 1M-token context window and text, image, and file input.
- Input price
- $2.00USD / 1M tokens
- Output price
- $10.00USD / 1M tokens
- Context window
- N/A
- Max output
- 128K
Try the model
Playground
Input⌘ / Ctrl + Enter
Try a prompt
OutputReady
Your response will appear here
Choose an example or write a prompt, then click Run.
Specifications
Pricing
- Input
- $2 / 1M tokens
- Output
- $10 / 1M tokens
- Billing formula
- usage.prompt_tokens * 2 / 1000000 + usage.completion_tokens * 10 / 1000000
Context & modalities
- Max output
- 128,000 tokens
- Input
- Text, image
- Output
- Text
Capabilities
- Chat
- Supported
- Vision
- Supported
- Reasoning
- Supported
- Structured output
- Supported
- Function calling
- Supported
- Audio input
- Not supported
Access
- Provider
- Anthropic
- Model ID
- anthropic/claude-sonnet-5.5
- Execution
- sync
- API
- Chat Completions API
- Endpoint
- /v1/chat/completions
Start building
Send your first request
OpenAI-compatible endpoint with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "anthropic/claude-sonnet-5.5",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Messages API
Anthropic-compatible request through SandBase.
POST /v1/messages{
"model": "anthropic/claude-sonnet-5.5",
"max_tokens": 2048,
"messages": [
{
"role": "user",
"content": "Hello"
}
]
}{
"id": "msg_…",
"type": "message",
"role": "assistant",
"content": [
{
"type": "text",
"text": "Hello!"
}
]
}Choose your model
Compare models
| Model | Context | Input / 1M | Output / 1M | Released |
|---|---|---|---|---|
Anthropic: Claude Sonnet 5.5This model Anthropic | — | $2.00 | $10.00 | Sep 28, 2026 |
Anthropic | 1M | — | — | Sep 22, 2026 |
Anthropic | 1M | — | — | Sep 1, 2026 |
Anthropic | 1M | — | — | Jul 25, 2026 |
Anthropic | 1M | — | — | Jun 30, 2026 |
Anthropic | 1M | — | — | Jun 9, 2026 |