Claude Sonnet 4.5
Pricing & Specs
Anthropic · $3 input / $15 output per 1M tokens · 200K context window
The per-token price never tells the full story. A typical task (1K input + 500 output tokens) on Claude Sonnet 4.5 costs about $0.0105, roughly $10.50 per 1,000 runs. But if it needs 3x the tokens of a cheaper model to match quality on YOUR task, the economics flip. The only way to know is to benchmark it on your actual workload.
Claude Sonnet 4.5 API Pricing
| Tokens | Price |
|---|---|
| Input | $3 / 1M tokens |
| Output | $15 / 1M tokens |
| Cached input | $0.3 / 1M tokens |
50% discount available for batch API requests. Batch API pricing is available for this model at 50%. Cache writes and cache hits or refreshes are billed separately.
What that means in practice
Claude Sonnet 4.5 Specs
| Spec | Value |
|---|---|
| Context window | 200K tokens |
| Max output tokens | 64K tokens |
| Input modalities | text, image |
| Output modalities | text |
| Latency (measured by OpenMark) | ~1.2s median response |
| Reasoning model | Yes |
| Tool / function calling | Yes |
| JSON mode | Yes |
| Streaming | Yes |
| Prompt caching | Yes |
| Batch API | Yes |
FAQ
How much does Claude Sonnet 4.5 cost?
Claude Sonnet 4.5 costs $3 per 1M input tokens and $15 per 1M output tokens ($0.3 per 1M cached input tokens).
What is Claude Sonnet 4.5's context window?
Claude Sonnet 4.5 has a 200K-token context window. Maximum output is 64K tokens.
Can I test Claude Sonnet 4.5 on my own task?
Yes. OpenMark lets you benchmark Claude Sonnet 4.5 against 100+ models on your own task with real API calls, with no API keys needed, free tier available.
Is Claude Sonnet 4.5 the right model for YOUR task?
Pricing tables can't answer that. Benchmark it against 100+ models
on your actual workload: real API calls, real costs. Free tier available.