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
- $1.70
$2.00USD / 1M tokens - Output price
- $8.50
$10.00USD / 1M tokens - Cache read
- $0.09
$0.10USD / 1M tokens - Cache write
- $2.13
$2.50USD / 1M tokens - Context window
- 1M
- Max output
- 128K
Specifications
- Input
- Text, image
- Output
- Text
Independent evaluations
Benchmarks
Scores on standardized evaluations, compared with other models on SandBase.
Metrics sourced from Artificial Analysis · Intelligence Index v5 · Updated 2026-10-29
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# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(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"Questions
FAQ
How do I call Anthropic Claude Sonnet 5.5 through SandBase?
Create a SandBase API key, then send requests with the model ID "anthropic/claude-sonnet-5.5" to Chat Completions API (/v1/chat/completions) or Messages API (/v1/messages) at https://api.sandbase.ai. The request examples on this page show the exact payload.
How much does Anthropic Claude Sonnet 5.5 cost?
$1.70 per 1M input tokens and $8.50 per 1M output tokens with the current 15% discount (list price $2 / $10), billed per request from your SandBase balance.
What is the context window of Anthropic Claude Sonnet 5.5?
1M tokens of context, with up to 128K output tokens per response.
How does Anthropic Claude Sonnet 5.5 score on benchmarks?
Anthropic Claude Sonnet 5.5 scores 54.2 on the Artificial Analysis Intelligence Index (v5), ranking #4 of 21 models on SandBase. Source: Artificial Analysis, measured as Claude Sonnet 5.5 (Max, Default Fallback).
Which features does Anthropic Claude Sonnet 5.5 support?
Anthropic Claude Sonnet 5.5 supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate Anthropic account?
No. One SandBase API key and balance gives you access to Anthropic Claude Sonnet 5.5 and the other models in the catalog; you do not need to sign up with Anthropic separately.