Anthropic · released Oct 7, 2026
Claude Haiku 5.5
Claude Haiku 5.5 is Anthropic's cheapest model and suits simple, high-volume tasks.
3 weeks oldThinks before answering
- Input price
- $0.10 / M
- Output price
- $0.50 / M
- Context
- 1M tokens
- Longest reply
- 128K
- Reads
- text, image, pdf
- Knows up to
- 2026-06
Where it shines
- It costs $0.10 in, $0.50 out per million tokens.
- It scores 89.6 on GPQA.
Where it struggles
- Its SimpleQA score of 23.8 means it misses many facts.
- Its creative writing score of 1336 is weak.
Where you can use it
- Anthropic APIAPI$0.10 in / $0.50 out per million tokens.
- OpenRouterAPIListed as
anthropic/claude-haiku-5.5
How it scores on each job
Scores run 0 to 100 and blend every measure we have for that job. The number after the dot is its rank among the 33 models in the lineup.
The evidence
| Measure | Score | Rank in lineup | Source |
|---|---|---|---|
| Epoch Capabilities Index | 159 | #10 | Epoch AI |
| LMArena text | 1401 | #26 | LMArena |
| LMArena hard prompts | 1421 | #26 | LMArena |
| LMArena instruction following | 1416 | #26 | LMArena |
| LMArena multi-turn | 1396 | #26 | LMArena |
| LMArena creative writing | 1336 | #26 | LMArena |
| LMArena writing & language | 1370 | #26 | LMArena |
| LMArena coding | 1450 | #26 | LMArena |
| LMArena math | 1413 | #26 | LMArena |
| LMArena business & finance | 1406 | #26 | LMArena |
| LMArena legal & government | 1395 | #26 | LMArena |
| LMArena medicine | 1372 | #26 | LMArena |
| WebDev Arena | 1588 | #19 | LMArena |
| Agent Arena | #24 | #14 | LMArena |
| GPQA Diamond | 90% | #21 | Epoch AI |
| Humanity's Last Exam | 30% | #7 | Epoch AI |
| FrontierMath | 75% | #12 | Epoch AI |
| SimpleQA Verified | 24% | #23 | Epoch AI |
| ARC-AGI-2 | 61% | #17 | Epoch AI |
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