Claude Opus 4.5
anthropic/claude-opus-4.5Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and reasoning benchmarks, and improved robustness to prompt injection. The model is designed to operate efficiently across varied effort levels, enabling developers to trade off speed, depth, and token usage depending on task requirements. It comes with a new parameter to control token efficiency, which can be accessed using the OpenRouter Verbosity parameter with low, medium, or high.
- Input price
- $5.00USD / 1M tokens
- Output price
- $25.00USD / 1M tokens
- Cache read
- $0.50USD / 1M tokens
- Cache write
- $6.25USD / 1M tokens
- Context window
- 200K
- Max output
- 64K
Specifications
- Input
- Text, image
- Output
- Text
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Choose either supported API with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "anthropic/claude-opus-4.5",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call Anthropic Claude Opus 4.5 through SandBase?
Create a SandBase API key, then send requests with the model ID "anthropic/claude-opus-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 Opus 4.5 cost?
$5 per 1M input tokens and $25 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 Opus 4.5?
200K tokens of context, with up to 64K output tokens per response.
Which features does Anthropic Claude Opus 4.5 support?
Anthropic Claude Opus 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 Opus 4.5 and the other models in the catalog; you do not need to sign up with Anthropic separately.