claude-sonnet-4-5 · Anthropic
The 2025 balanced Claude at $3/$15 — now undercut by Sonnet 5, which is both cheaper and bigger-context.
Last checked Aug 16, 2026. Calculations use the listed base rates; provider-specific tiers, cache writes, batch pricing, and long-context rules may differ. Confirm the current rate at the official provider source.
Input
$3.00
per 1M tokens
Output
$15.00
per 1M tokens
Cached input
$0.30
per 1M tokens
Context window
200K
max output 64K
Claude Sonnet 4.5 cost calculator
What Claude Sonnet 4.5 costs per task
| Use case | Input tokens | Output tokens | Cost / request | Monthly @ 1K req/day |
|---|---|---|---|---|
| Customer support chatbot | 3,500 | 350 | $0.009135 | $274.05 |
| RAG / search-augmented answers | 8,000 | 500 | $0.0207 | $621.00 |
| AI coding assistant | 12,000 | 2,000 | $0.0466 | $1,396.80 |
| Document summarization | 25,000 | 600 | $0.0773 | $2,317.50 |
| Agentic workflow | 40,000 | 1,500 | $0.0723 | $2,169.00 |
| Content generation | 800 | 1,200 | $0.0198 | $592.56 |
| Data extraction & tagging | 2,000 | 250 | $0.00867 | $260.10 |
| Translation | 5,000 | 5,500 | $0.0955 | $2,864.25 |
Assumes each use case's typical cacheable share of input. See full cost scenarios.
Compare with alternatives
| Model | Input /M | Output /M | Context | Chat request* |
|---|---|---|---|---|
| Claude Sonnet 4.5 | $3.00 | $15.00 | 200K | $0.0186 |
| Claude Sonnet 5compare | $2.00 | $10.00 | 1M | $0.0124 |
| GPT-5.1 | $1.25 | $10.00 | 400K | $0.0108 |
| Gemini 2.5 Pro | $1.25 | $10.00 | 1M | $0.0108 |
*4,000 in + 800 out tokens, 50% cached input where available.
Related calculations
FAQ
Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens, with cached input at $0.30 per 1M tokens. Verified Aug 16, 2026 against https://platform.claude.com/docs/en/docs/about-claude/pricing.
Claude Sonnet 4.5 supports a 200,000-token context window with up to 64,000 output tokens per request, tokenized with Claude BPE (~100K vocab).
At $3.00/M input and $15.00/M output, Claude Sonnet 4.5 sits above Claude Sonnet 5 ($2.00/M in, $10.00/M out) — see the comparison table for full-workload differences.