AI Desk · Model Identity · Compare
Inception: Mercury 2.5 Preview · Ox Alpha
Identity similarity: lowDivergent fingerprints · 1/25These models tokenise differently. Divergence on the high-information strings (CJK, emoji, digits) separates unrelated vocabularies within a handful of samples.
Inception: Mercury 2.5 Preview recordOx Alpha recordOpen in the interactive bench
Tokenizer fingerprint
1 of 25 mutually clean strings agree| Test string | Inception: Mercury 2.5 Preview | Ox Alpha | Verdict |
|---|---|---|---|
| en-prose | x | 14 | – |
| en-long | 2 | 16 | differs |
| spaces-20 | x | 3 | – |
| spaces-60 | x | 3 | – |
| tabs-20 | x | 3 | – |
| newlines-20 | x | 4 | – |
| mixed-ws | x | 5 | – |
| digits-9 | x | 5 | – |
| digits-12 | x | 7 | – |
| digits-30 | 16 | 10 | differs |
| digits-sep | x | 9 | – |
| float-long | 8 | 14 | differs |
| zh-common | x | 9 | – |
| zh-long | x | 10 | – |
| zh-rare | 4 | 18 | differs |
| ja-kana | x | 10 | – |
| ja-kanji | x | 14 | – |
| ko | x | 17 | – |
| ru | x | 13 | – |
| ar | x | 13 | – |
| he | x | 24 | – |
| hi | 6 | 27 | differs |
| th | x | 24 | – |
| el | x | 14 | – |
| emoji-basic | x | 5 | – |
| emoji-skin | 16 | 10 | differs |
| emoji-zwj-family | 4 | 7 | differs |
| emoji-zwj-x3 | 39 | 21 | differs |
| emoji-flags | 10 | 24 | differs |
| emoji-prof | 14 | 15 | differs |
| math | 15 | 27 | differs |
| boxdraw | 14 | 28 | differs |
| combining | x | 10 | – |
| cjk-ext-b | x | 13 | – |
| surrogates | 26 | 40 | differs |
| zalgo | 22 | 22 | match |
| rtl-mix | x | 8 | – |
| py-code | 11 | 25 | differs |
| py-indent | 4 | 15 | differs |
| json | 11 | 21 | differs |
| html | 2 | 16 | differs |
| regex | 29 | 44 | differs |
| camel | x | 5 | – |
| snake | x | 6 | – |
| rare-word-x5 | 16 | 31 | differs |
| repeat-tok | 7 | 22 | differs |
| base64 | 21 | 35 | differs |
| hex | 3 | 14 | differs |
| url | 5 | 17 | differs |
| uuid | 21 | 28 | 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 | Inception: Mercury 2.5 Preview | Ox Alpha | Verdict |
|---|---|---|---|
| Context length | 260000 | 1048576 | × differs |
| Max output tokens | 65536 | 131072 | × differs |
| Supported parameters | include_reasoning, max_tokens, reasoning, reasoning_effort, response_format, stop, structured_outputs, temperature, tool_choice, tools | include_reasoning, max_tokens, reasoning, reasoning_effort, response_format, temperature, tool_choice, tools, top_k, top_p | × differs |
| Defaults | {} | {"temperature":1,"top_p":0.95} | × differs |
| Reasoning contract | {"mandatory":false,"default_enabled":true,"supported_efforts":["high","medium","low","none"],"default_effort":"medium"} | {"mandatory":true,"default_enabled":true,"supported_efforts":["max","high","low"],"default_effort":"max"} | × differs |
| Modalities | text->text | text+image+video->text | × differs |
Method: tokenizer fingerprinting, v1, 50 strings. This page is static and dated; the interactive bench compares any two of the 486 catalogue models.