Model vs model
Claude Haiku 5.5 vs Kimi K3.1 Pro
Kimi K3.1 Pro scores higher on the Artificial Analysis Intelligence Index (55.1 vs 43.4), but costs 20× as much: $4 per 1M tokens blended against $0.20 for Claude Haiku 5.5. Pick Claude Haiku 5.5 for high-volume work where cost matters, and Kimi K3.1 Pro when quality matters most. The biggest gap is on Terminal-Bench 4.0 (terminal tasks), where Kimi K3.1 Pro scores 67.2 against 32.8 for Claude Haiku 5.5.
At a glance
Longer bar means the bigger number.
Blended price · per 1M tokens, lower is better
Intelligence Index · Artificial Analysis, higher is better
Where they sit among all 31 models
Claude Haiku 5.5 ranks 13th of the 30 models with an Intelligence Index, Kimi K3.1 Pro 3rd. Up and to the left is smarter for less money. Hover or tap a dot for its numbers, then click it to compare that model with Claude Haiku 5.5.
Which one to pick
Pick Claude Haiku 5.5 if
- you want the lower bill ($0.20 vs $4 per 1M tokens blended)
- you need to send PDFs
Pick Kimi K3.1 Pro if
- you want the higher overall score (55.1 vs 43.4)
- you care about Terminal-Bench 4.0 (terminal tasks): 67.2 vs 32.8
- you care about Humanity's Last Exam (hard reasoning): 52.5 vs 44.4
- you want open weights you can run yourself
How smart is each one?
Of the 10 scores both models have, Kimi K3.1 Pro is ahead on every one.
Every intelligence score we have
Out of 100, higher is better. Claude Haiku 5.5 Kimi K3.1 Pro
Overall
Intelligence Index
43.455.1
By field of work
Finance & accounting
43.956.5Legal
42.355.8Healthcare & medicine
39.9Kimi K3.1 Pro: not scored yet
Economics
51.260Engineering
44.955.9Strategy & operations
40.459.4
Benchmarks
Factual knowledge · SimpleQA
23.8Kimi K3.1 Pro: not scored yet
Hard reasoning · Humanity's Last Exam
44.452.5Scientific coding · SciCode
5560.8Terminal tasks · Terminal-Bench 4.0
32.867.2Long documents · AA-LCR
82.7 · 86.3
Our tests
Hallucination test · our test, higher means it made up less
92.5Kimi K3.1 Pro: not scored yet
Rule that has to last 4 turns · our test, % of tries passed
0Kimi K3.1 Pro: not scored yet
Three bullets, no letter e · our test, % of tries passed
100Kimi K3.1 Pro: not scored yet
The specs
| Spec | Claude Haiku 5.5 | Kimi K3.1 Pro |
|---|---|---|
| Input price | $0.10 per 1M | $2 per 1M |
| Output price | $0.50 per 1M | $10 per 1M |
| Context window | 1M | 1.05M |
| Max output | 128K | 1.05M |
| Accepts | Text, Image, PDF | Text, Image |
| Open weights | No | Yes |
| Lab | Anthropic | Kimi |
| Released | Oct 2026 | Oct 2026 |
| Knowledge cutoff | Jun 2026 | Not published |
Blended price weighs 3 parts input to 1 part output. List prices from models.dev.
Questions
Is Claude Haiku 5.5 or Kimi K3.1 Pro cheaper?
Claude Haiku 5.5 is cheaper. It charges $0.10 per 1M input tokens and $0.50 per 1M output tokens, against $2 and $10 for Kimi K3.1 Pro. Blended 3 parts input to 1 part output, that is $0.20 against $4 per 1M tokens.
Which is smarter, Claude Haiku 5.5 or Kimi K3.1 Pro?
Kimi K3.1 Pro scores higher on the Artificial Analysis Intelligence Index, 55.1 against 43.4 for Claude Haiku 5.5. The biggest differences are on Terminal-Bench 4.0 (32.8 vs 67.2) and Humanity's Last Exam (44.4 vs 52.5).
Which has the longer context window?
They are about the same: Claude Haiku 5.5 accepts 1M tokens and Kimi K3.1 Pro 1.05M.
Can I compare Claude Haiku 5.5 and Kimi K3.1 Pro on my own prompt?
Yes. ModelCompare sends one prompt to both models at once and shows each answer side by side with what it cost. You can try it free without an account.
Related comparisons
Where the numbers come from
Intelligence Index and benchmark scores are from Artificial Analysis, at each model’s highest effort, except SimpleQA, which is from Epoch AI, and the Uncensored score, which is from the UGI Leaderboard. The hallucination test is ours: questions with one exact answer, fake evidence pushed against right answers and requests that tempt a model to name packages that don’t exist. Prices are list prices from models.dev. Example answers come from our own test runs. Updated October 23, 2026.