Claude Haiku 4.5
Claude Haiku 4.5 matches Sonnet 4 coding at one-third the cost and over twice the speed. It scores 73.3% on SWE-bench Verified at $1/$5.
Fastest Claude, more than twice as fast as Sonnet 4 and four to five times faster than Sonnet 4.5, with about 90% of Sonnet 4.5's agentic coding performance. It surpasses Sonnet 4 at some computer-use tasks. Released under ASL-2, unlike the ASL-3 Sonnet 4.5.
- Date
- Wednesday, 15 October 2025
- Lab
- Anthropic
- Kind
- model
- Access
- closed API
- Price
- $1/$5 per M tokens in/out
Figures
| Measure | Value | Measured by |
|---|---|---|
| SWE-bench Verified | 73.3% Claude Haiku 4.5 | company |
| Terminal-Bench | 40.21% 41.75% with 32K thinking | company |
Still Anthropic's current Haiku as of 2026-10-04; a Haiku 5.5 was promised 'in the coming weeks' on the Opus 5.5 page (2026-09-22) and had not been found released. Retirement not sooner than 2026-10-15 per models overview.
Sources
This record was checked against its sources on 6 October 2026. How we check