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Kwaipilot: KAT-Coder-Air V2.5 · Union Alpha
Identity similarity: lowDivergent fingerprints · 17/47These models tokenise differently. The rows that part here are the digit, CJK, non-Latin script, emoji and English prose strings. Divergence on high-information strings separates unrelated vocabularies within a handful of samples.
Kwaipilot: KAT-Coder-Air V2.5 recordUnion Alpha recordOpen in the interactive bench
Tokenizer fingerprint
17 of 47 mutually clean strings agree| Test string | Kwaipilot: KAT-Coder-Air V2.5 | Union Alpha | Verdict |
|---|---|---|---|
| en-prose | 14 | x | – |
| en-long | 16 | x | – |
| spaces-20 | 3 | 3 | match |
| spaces-60 | 3 | 3 | match |
| tabs-20 | 3 | 3 | match |
| newlines-20 | 4 | 4 | match |
| mixed-ws | 5 | 5 | match |
| digits-9 | 9 | 3 | differs |
| digits-12 | 12 | 4 | differs |
| digits-30 | 30 | 12 | differs |
| digits-sep | 12 | 7 | differs |
| float-long | 22 | 9 | differs |
| zh-common | 9 | 12 | differs |
| zh-long | 10 | 18 | differs |
| zh-rare | 18 | 18 | match |
| ja-kana | 7 | 11 | differs |
| ja-kanji | 10 | x | – |
| ko | 13 | 14 | differs |
| ru | 12 | 14 | differs |
| ar | 10 | 12 | differs |
| he | 14 | 24 | differs |
| hi | 20 | 15 | differs |
| th | 12 | 14 | differs |
| el | 13 | 13 | match |
| emoji-basic | 9 | 10 | differs |
| emoji-skin | 30 | 30 | match |
| emoji-zwj-family | 18 | 15 | differs |
| emoji-zwj-x3 | 54 | 45 | differs |
| emoji-flags | 24 | 24 | match |
| emoji-prof | 29 | 26 | differs |
| math | 29 | 31 | differs |
| boxdraw | 28 | 23 | differs |
| combining | 5 | 11 | differs |
| cjk-ext-b | 13 | 13 | match |
| surrogates | 40 | 40 | match |
| zalgo | 36 | 35 | differs |
| rtl-mix | 6 | 8 | differs |
| py-code | 26 | 25 | differs |
| py-indent | 18 | 15 | differs |
| json | 25 | 20 | differs |
| html | 16 | 16 | match |
| regex | 44 | 44 | match |
| camel | 5 | 5 | match |
| snake | 6 | 6 | match |
| rare-word-x5 | 30 | 30 | match |
| repeat-tok | 21 | 21 | match |
| base64 | 36 | 35 | differs |
| hex | 17 | 11 | differs |
| url | 19 | 17 | differs |
| uuid | 36 | 27 | differs |
Values are the marginal prompt-token cost of each string with the model's fixed overhead subtracted. An x marks a row excluded as corrupt for that model.
API surface
The declared serving contracts differ| Field | Kwaipilot: KAT-Coder-Air V2.5 | Union Alpha | Verdict |
|---|---|---|---|
| Context length | 256000 | 262144 | × differs |
| Max output tokens | 80000 | 131072 | × differs |
| Supported parameters | logprobs, max_tokens, presence_penalty, response_format, stop, structured_outputs, temperature, tool_choice, tools, top_logprobs, top_p | max_tokens, response_format, temperature, tool_choice, tools, top_p | × differs |
| Defaults | {"temperature":null,"top_p":null,"top_k":null,"frequency_penalty":null,"presence_penalty":null,"repetition_penalty":null} | {} | × differs |
| Reasoning contract | – | – | ✓ match |
| Modalities | text->text | text+image->text | × differs |
Method: tokenizer fingerprinting, v1, 50 strings. This page is static and dated; the interactive bench compares any two of the 338 measured models.