Anthropic
claude-sonnet-4.5 API Pricing
Anthropic charges $3.00 per 1M input tokens and $15.00 per 1M output tokens across a 1M context window. Verified 2026-08-18 against the official Anthropic pricing page.
Input / 1M tokens
$3.00
Output / 1M tokens
$15.00
Context window
1M
What it costs to run
| Workload | Tokens | Cost |
|---|---|---|
| Single short call | 2K in, 500 out | $0.013 |
| Typical chat turn | 10K in, 1K out | $0.045 |
| Long document pass | 100K in, 2K out | $0.330 |
| 1,000 chat turns | 10M in, 1M out | $45.00 |
Price history
No price move recorded for claude-sonnet-4.5 since tracking began on 2026-08-18. Every future change lands here with the before and after.
How it compares
Ranked on the blended cost of a typical chat turn (10K in, 1K out), not the input rate alone.
| OpenAI | gpt-5.3-codex | $0.032 per turn |
| gemini-3.1-pro-preview | $0.032 per turn | |
| OpenAI | gpt-5.6-terra | $0.032 per turn |
| OpenAI | gpt-4o | $0.035 per turn |
| OpenAI | gpt-5.4 | $0.040 per turn |
| Anthropic | claude-sonnet-4.5 | $0.045 per turn |
| Anthropic | claude-opus-5.5 | $0.060 per turn |
| OpenAI | gpt-5.6-sol | $0.060 per turn |
| OpenAI | gpt-4o-2024-05-13 | $0.065 per turn |
| Anthropic | claude-opus-4-7 | $0.075 per turn |
| Anthropic | claude-opus-4-6 | $0.075 per turn |
TechFastForward coverage of claude-sonnet-4.5
What we wrote when this model, or the rest of its line, was news.
- Salesforce Just Dismantled 25 Years of Software Design, and Handed the Keys to AI Agents2026-05-04
- Mistral's 128B Gamble: One Model to Replace Three, and Why Europe's AI Challenger Is Playing a Different Game2026-05-03
- America Paid $200 for This Coding AI. China Built a Better One for $3.2026-05-02
- Google Antigravity Is Free, Scores 76% on SWE-bench, and Nobody Is Panicking Enough2026-05-02
- Anthropic Kills Fable 5 and Mythos 5 on US Export Order2026-06-13
- Microsoft MAI-Thinking-1 Beats Claude Sonnet in 20262026-06-06
Free JSON API
Every tracked model, including this one, is available as JSON. Free to use with attribution and a link back.
curl https://techfastforward.com/api/data/llm-pricingMaintained by Jordan Hale, TechFastForward. Prices are read daily from the official provider page and recorded only when they move. See every tracked model on the LLM API Pricing Tracker.