Claude Sonnet 4.5 API Pricing
Anthropic · released 2025-09-29
Also searched as: Sonnet 4.5 pricing
Claude Sonnet 4.5 price
0.300¢ / 1K
1.50¢ / 1K
0.600¢ / 1K
Official list price from Anthropic, as recorded by models.dev
What it actually costs
| Workload | Tokens | Cost |
|---|---|---|
| Short chat reply | 500 in / 300 out | 0.6¢ |
| RAG query | 4,000 in / 500 out | $0.0195 |
| Long document summary | 50,000 in / 1,000 out | $0.1650 |
| Code review of a 2k-line file | 30,000 in / 2,000 out | $0.1200 |
| 1,000 chat replies/day for 30 days | 30,000 × (500 in / 300 out) | $180.00 |
Cost = (input tokens ÷ 1,000,000 × $3.00) + (output tokens ÷ 1,000,000 × $15.00).
Benchmarks
| Benchmark | Value | Source | As of |
|---|---|---|---|
| Epoch Capabilities Index (ECI) | No public data yet | ||
| Epoch Mock AIME accuracy | 35.6% | epoch | 2025-09-29 |
| Epoch FrontierMath (T1–3) accuracy | No public data yet | ||
| Arena text rating | 1455 | arena | 2026-10-28 |
| Arena coding rating (human preference votes, not task accuracy) | 1512 | arena | 2026-10-28 |
| Arena math rating | 1428 | arena | 2026-10-28 |
| Arena WebDev rating | 1385 | arena | 2026-10-28 |
More from Anthropic
| Model | Released | Blended $/1M |
|---|---|---|
| Claude Haiku 5.5 | 2026-10-07 | $0.20 |
| Claude Sonnet 5.5 | 2026-09-28 | $4.00 |
| Claude Opus 5.5 | 2026-09-22 | $8.00 |
| Claude Mythos 5.1 | 2026-09-01 | $20.00 |
| Claude Fable 5.1 | 2026-09-01 | $20.00 |
| Claude Opus 5 | 2026-07-24 | $10.00 |
| Claude Sonnet 5 | 2026-06-30 | $4.00 |
| Claude Mythos 5 | 2026-06-09 | $20.00 |
Count tokens & estimate cost for Claude Sonnet 4.5
Prices: Anthropic's official list price as recorded by models.dev; benchmarks: see sources below; last synced 2026-11-06.
FAQ
Who develops Claude Sonnet 4.5?
Claude Sonnet 4.5 is developed by Anthropic, released 2025-09-29.
How much does Claude Sonnet 4.5 cost per million tokens?
Claude Sonnet 4.5 costs $3.00 per 1M input tokens and $15.00 per 1M output tokens ($6.00 blended), per Anthropic's official list price as recorded by models.dev.
What is the Claude Sonnet 4.5 API price?
The Claude Sonnet 4.5 API price is $3.00 per 1M input tokens and $15.00 per 1M output tokens ($6.00 per 1M blended).
How much does Claude Sonnet 4.5 cost for a typical request?
A short chat reply (500 in / 300 out tokens) costs about 0.6¢ on Claude Sonnet 4.5, at $3.00/1M input and $15.00/1M output.
Is Claude Sonnet 4.5 free?
Claude Sonnet 4.5's official API list price is $3.00 per 1M input tokens and $15.00 per 1M output tokens. This site tracks list prices only, not free tiers or trial credits — check Anthropic's site for those.
Where does this data come from?
Pricing for Claude Sonnet 4.5 comes from models.dev and LiteLLM (open MIT-licensed catalogs); benchmark scores come from Epoch AI and LMArena (open CC BY 4.0 licenses) — see /data-sources/. Last synced 2026-11-06.