Claude Sonnet 4.5 (latest) API Pricing
Anthropic · released 2025-09-29
Also searched as: Claude Sonnet 4.5 pricing · Sonnet 4.5 price
Claude Sonnet 4.5 (latest) 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) | 147.6 | epoch | 2025-09-29 |
| Epoch Mock AIME accuracy | No public data yet | ||
| Epoch FrontierMath (T1–3) accuracy | No public data yet | ||
| Arena text rating | No public data yet | ||
| Arena coding rating (human preference votes, not task accuracy) | No public data yet | ||
| Arena math rating | No public data yet | ||
| Arena WebDev rating | No public data yet | ||
Similar ECI, lower price
| Model | ECI | Blended $/1M |
|---|---|---|
| GPT-5.4 nano | 146.4 | $0.4625 |
| DeepSeek V4 Flash | 146.9 | $0.525 |
| MiniMax-M3 | 147.6 | $0.525 |
| Gemini 3.1 Flash Lite | 144.9 | $0.5625 |
| GPT-5 Mini | 146.1 | $0.6875 |
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 (latest) See Claude Sonnet 4.5 (latest) on the leaderboard
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 (latest)?
Claude Sonnet 4.5 (latest) is developed by Anthropic, released 2025-09-29.
How much does Claude Sonnet 4.5 (latest) cost per million tokens?
Claude Sonnet 4.5 (latest) 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 (latest) API price?
The Claude Sonnet 4.5 (latest) 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 (latest) cost for a typical request?
A short chat reply (500 in / 300 out tokens) costs about 0.6¢ on Claude Sonnet 4.5 (latest), at $3.00/1M input and $15.00/1M output.
Is Claude Sonnet 4.5 (latest) free?
Claude Sonnet 4.5 (latest)'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.
How does Claude Sonnet 4.5 (latest) rank on benchmarks?
Claude Sonnet 4.5 (latest) scores 147.6 on the Epoch Capabilities Index (ECI), ranking #65 of 107 models we track with a published ECI score.
Is there a cheaper model with a similar ECI to Claude Sonnet 4.5 (latest)?
Yes — GPT-5.4 nano scores a similar ECI (146.4) at $0.4625/1M blended, versus $6.00/1M for Claude Sonnet 4.5 (latest).
Where does this data come from?
Pricing for Claude Sonnet 4.5 (latest) 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.