Claude Haiku 5.5
Claude Haiku 5.5 is the fastest model in Anthropic's Claude 5.5 family and the successor to Claude 4.5 Haiku. It scores 48.4% on CursorBench at max effort, on the same cost-performance curve as Sonnet 5.5 and Opus 5.5, at a tenth of Haiku 4.5's per-token price for requests up to 100k input tokens. Add it to the model picker from Cursor Settings > Models.
Strengths
- Low cost for high-volume work. Requests up to 100k input tokens bill at $0.10/M input and $0.50/M output.
- The first Haiku with effort levels. With thinking on, its CursorBench score climbs from 30.9% at low effort to 48.4% at max.
- Thinking can be turned off at low, medium, and high effort for faster, cheaper responses.
- Supports context windows up to 1M tokens.
Limitations
- Requests above 100k input tokens bill at 5x the standard rates. Long agent sessions with large contexts cost more per token once they cross that line.
- Sonnet 5.5 and Opus 5.5 score higher on CursorBench for harder tasks.
- Turning thinking off lowers quality. On CursorBench it scores 22.1% to 26.2% with thinking off, compared with 30.9% to 42.3% with thinking on at the same effort levels.
Tools
Haiku 5.5 has access to all agent tools when used with Cursor including:
Find files by name, read directory structures, and grep for patterns.
Generate search queries and fetch results from the web.
Read file contents, including images for vision-capable models.
Suggest edits and apply them automatically.
Execute terminal commands and monitor output.
Control a browser to take screenshots, test applications, and verify visual changes. See the Browser documentation.
Generate images from text descriptions or reference images.
Ask clarifying questions while continuing to work in the background.
Retrieve rules based on type and description.
Learn more about how tools work and tool calling fundamentals.
Pricing
Cursor plans include two usage pools. Haiku 5.5 draws from the third-party Other Models pool, which charges at the rates below. All prices are per million tokens.
| Name | ||||
|---|---|---|---|---|
| $0.1 | $0.125 | $0.01 | $0.5 | |
| $0.5 | $0.625 | $0.05 | $2.5 |
Requests up to 100k input tokens bill at $0.10/M input and $0.50/M output. Prompt-cache writes are $0.125/M and cache reads are $0.01/M.
Requests above 100k input tokens (long context) bill at 5x those rates: $0.50/M input, $0.625/M cache write, $0.05/M cache read, and $2.50/M output.
A thinking variant is available for deeper reasoning.