Claude Sonnet 4.5
anthropic/claude-sonnet-4.5Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with improvements across system design, code security, and specification adherence. The model is designed for extended autonomous operation, maintaining task continuity across sessions and providing fact-based progress tracking.
- Input price
- $3.00USD / 1M tokens
- Output price
- $15.00USD / 1M tokens
- Cache read
- $0.30USD / 1M tokens
- Cache write
- $3.75USD / 1M tokens
- Context window
- 200K
- Max output
- 64K
Specifications
- Input
- Text, image
- Output
- Text
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# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "anthropic/claude-sonnet-4.5",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call Anthropic Claude Sonnet 4.5 through SandBase?
Create a SandBase API key, then send requests with the model ID "anthropic/claude-sonnet-4.5" 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 4.5 cost?
$3 per 1M input tokens and $15 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.
What is the context window of Anthropic Claude Sonnet 4.5?
200K tokens of context, with up to 64K output tokens per response.
Which features does Anthropic Claude Sonnet 4.5 support?
Anthropic Claude Sonnet 4.5 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 4.5 and the other models in the catalog; you do not need to sign up with Anthropic separately.