Claude Sonnet 4.5 API Pricing — $3.00/M input, $15.00/M output
High-performance standard for logical reasoning and coding.
Legacy model — superseded by 4.6 series See Claude Sonnet 4.6 pricing.
No announced shutdown date. Source · Full retirement tracker
Speed
Not yet measured — see the speed benchmark leaderboard for models we do track.
Cost at scale
| Tokens / month | Est. cost (blended 3:1) |
|---|---|
| 100,000 | $0.60 |
| 1,000,000 | $6.00 |
| 10,000,000 | $60.00 |
| 100,000,000 | $600.00 |
How Claude Sonnet 4.5 compares
Claude Haiku 4.5 — $2.00/MClaude Sonnet 4.6 — $6.00/MClaude Sonnet 4 — $6.00/MClaude Opus 4.8 — $10.00/MClaude Opus 4.7 — $10.00/MClaude Sonnet 4.6 — $6.00/MClaude Sonnet 4 — $6.00/MGPT-5.4 — $5.63/M
Head-to-head comparisons
FAQ
Is Claude Sonnet 4.5 cheaper than Claude Sonnet 4.6?
Claude Sonnet 4.5 costs $6.00/M blended tokens, Claude Sonnet 4.6 costs $6.00/M — Claude Sonnet 4.6 is cheaper.
How much does 1 million tokens cost with Claude Sonnet 4.5?
At a 3:1 input:output ratio, 1 million blended tokens costs approximately $6.00. Pure input costs $3.00/M; pure output costs $15.00/M.
Who provides Claude Sonnet 4.5?
Claude Sonnet 4.5 is served by Anthropic. Pricing was last verified on 2026-04-06 against https://www.anthropic.com/pricing.
