Inception: Mercury 2.5 · Inception: Mercury 2.5 Preview

Insufficient evidenceNot comparable yetAt least one of these records is declared unmeasurable (Inception: Mercury 2.5: unmeasurable:caching; Inception: Mercury 2.5 Preview: unmeasurable:caching), so no similarity verdict is published; the declared contracts below can still be compared.

Inception: Mercury 2.5 record Inception: Mercury 2.5 Preview record Open in the interactive bench

View all 50 test strings19 matched · 6 different · 25 excluded

String-by-string results

Expand a string to read or copy its exact text. Each row compares the two models’ token counts.

19 of 25 clean strings agree

Showing all 50 strings.

Test string	Inception: Mercury 2.5	Inception: Mercury 2.5 Preview	Result
English sentenceen-prose Exact text The quick brown fox jumps over the lazy dog near the riverbank.	Excluded	Excluded	Excluded
Long English sentenceen-long Exact text Attribution of a stealth model requires evidence that the model cannot choose to withhold.	2	2	✓ Matched
20 spacesspaces-20 Exact text a b Show whitespace marks · = space, ⇥ = tab, ↵ = line break a····················b	Excluded	Excluded	Excluded
60 spacesspaces-60 Exact text a b Show whitespace marks · = space, ⇥ = tab, ↵ = line break a····························································b	Excluded	Excluded	Excluded
20 tabstabs-20 Exact text a b Show whitespace marks · = space, ⇥ = tab, ↵ = line break a⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥⇥b	Excluded	Excluded	Excluded
20 line breaksnewlines-20 Exact text a b Show whitespace marks · = space, ⇥ = tab, ↵ = line break a↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ ↵ b	Excluded	Excluded	Excluded
Mixed whitespacemixed-ws Exact text a b Show whitespace marks · = space, ⇥ = tab, ↵ = line break a·⇥↵ ··⇥↵ ···b	Excluded	Excluded	Excluded
9 digitsdigits-9 Exact text 123456789	Excluded	Excluded	Excluded
12 digitsdigits-12 Exact text 123456789012	Excluded	Excluded	Excluded
30 repeated digitsdigits-30 Exact text 111111111111111111111111111111	16	16	✓ Matched
Formatted numberdigits-sep Exact text 1,234,567.89	Excluded	Excluded	Excluded
Long decimalfloat-long Exact text 3.14159265358979323846	8	8	✓ Matched
Chinese sentencezh-common Exact text 这是一个用于测试分词器行为的中文句子	Excluded	Excluded	Excluded
Long Chinese sentencezh-long Exact text 人工智能模型的归属需要可验证的证据而不是自我报告	Excluded	Excluded	Excluded
Rare Chinese characterszh-rare Exact text 龘齉齾爩鱻麤靐飝鞻	4	4	✓ Matched
Japanese kanaja-kana Exact text これはトークナイザーのテストです	Excluded	Excluded	Excluded
Japanese kanjija-kanji Exact text 日本語の漢字と仮名の混在文章	Excluded	Excluded	Excluded
Koreanko Exact text 한국어 토크나이저 테스트 문장입니다	Excluded	Excluded	Excluded
Russianru Exact text Проверка токенизатора на кириллице	Excluded	Excluded	Excluded
Arabicar Exact text اختبار المحلل اللغوي للنصوص العربية	Excluded	Excluded	Excluded
Hebrewhe Exact text בדיקת מנתח אסימונים בעברית	Excluded	Excluded	Excluded
Hindihi Exact text यह टोकनाइज़र परीक्षण वाक्य है	6	6	✓ Matched
Thaith Exact text นี่คือประโยคทดสอบตัวแบ่งคำ	Excluded	Excluded	Excluded
Greekel Exact text Δοκιμή του τμηματοποιητή κειμένου	Excluded	Excluded	Excluded
Basic emojiemoji-basic Exact text 😀😃😄😁😆	Excluded	Excluded	Excluded
Emoji skin tonesemoji-skin Exact text 👍🏻👍🏼👍🏽👍🏾👍🏿	16	16	✓ Matched
Joined family emojiemoji-zwj-family Exact text 👨‍👩‍👧‍👦	4	4	✓ Matched
Repeated family emojiemoji-zwj-x3 Exact text 👨‍👩‍👧‍👦👨‍👩‍👧‍👦👨‍👩‍👧‍👦	39	39	✓ Matched
Flag emojiemoji-flags Exact text 🇬🇧🇺🇸🇨🇳🇯🇵	10	10	✓ Matched
Profession emojiemoji-prof Exact text 👩🏽‍💻👨🏿‍🚀🧑‍🔬	15	14	≠ Different
Mathematical symbolsmath Exact text ∀x∈ℝ ∃y∈ℚ : x⊕y ≡ ∅ ∧ ∇²φ = 0	15	15	✓ Matched
Box-drawing charactersboxdraw Exact text ┌─┬─┐│├┼┤└┴┘╔═╗╚╝	14	14	✓ Matched
Combining accentscombining Exact text áêĩōü	Excluded	Excluded	Excluded
Extended Chinese characterscjk-ext-b Exact text 𠀀𠀁𠀂𪛖	Excluded	Excluded	Excluded
Styled Unicode letterssurrogates Exact text 𝕳𝖊𝖑𝖑𝖔 𝓦𝓸𝓻𝓵𝓭 𝟙𝟚𝟛	26	26	✓ Matched
Layered combining markszalgo Exact text h̸̢̛e̵̛�݃l̷̨͐l̸̛͝o̶̧͝	22	22	✓ Matched
Mixed writing directionsrtl-mix Exact text hello שלום world مرحبا	Excluded	Excluded	Excluded
Python codepy-code Exact text def f(x): return [i2 for i in range(x) if i % 3 == 0] Show whitespace marks · = space, ⇥ = tab, ↵ = line break def·f(x):↵ ····return·[i2·for·i·in·range(x)·if·i·%·3·==·0]	12	11	≠ Different
Indented Pythonpy-indent Exact text if a: if b: if c: return 1 Show whitespace marks · = space, ⇥ = tab, ↵ = line break if·a:↵ ········if·b:↵ ················if·c:↵ ························return·1	4	4	✓ Matched
JSON objectjson Exact text {"model":"ox-alpha","context_length":1048576,"top_p":0.95}	11	11	✓ Matched
HTML markuphtml Exact text <div class="row"><span id="a">x</span></div>	2	2	✓ Matched
Regular expressionregex Exact text ^(?:[a-z0-9!#$%&+/=?^_`{\|}~-]+)@(?:[a-z0-9](?:[a-z0-9-])?\.)+$	30	29	≠ Different
Camel-case identifiercamel Exact text getUserAccountBalanceByIdentifier	Excluded	Excluded	Excluded
Snake-case identifiersnake Exact text get_user_account_balance_by_identifier	Excluded	Excluded	Excluded
Repeated long wordrare-word-x5 Exact text antidisestablishmentarianism antidisestablishmentarianism antidisestablishmentarianism antidisestablishmentarianism antidisestablishmentarianism	15	16	≠ Different
Repeated wordrepeat-tok Exact text lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem lorem	7	7	✓ Matched
Base64 textbase64 Exact text SGVsbG8gV29ybGQhIFRoaXMgaXMgYSB0ZXN0IHN0cmluZy4=	22	21	≠ Different
Hexadecimal texthex Exact text deadbeefcafebabe0123456789abcdef	3	3	✓ Matched
URL texturl Exact text https://openrouter.ai/api/v1/models?limit=100&offset=0	5	5	✓ Matched
UUIDuuid Exact text 3f2504e0-4f89-11d3-9a0c-0305e82c3301	22	21	≠ Different

Counts show each string’s prompt-token cost after the fixed overhead is subtracted. Excluded readings are kept separate from matched and different results.

Published model settings

Limits, prices and capabilities

Compare the essentials, then open the developer settings for more detail.

AInception: Mercury 2.5

BInception: Mercury 2.5 Preview

Context window

Same

Total token capacity per request

A260,000 tokens

B260,000 tokens

Maximum reply

Same

Published output limit in tokens

A65,536 tokens

B65,536 tokens

Input price

Same

US dollars per 1 million input tokens

AUS$0.04 / 1M tokens

BUS$0.04 / 1M tokens

Output price

Same

US dollars per 1 million output tokens

AUS$0.15 / 1M tokens

BUS$0.15 / 1M tokens

What you can send and receive

Same

AMercury 2.5

Accepts

text

Produces

text

BMercury 2.5 Preview

Accepts

text

Produces

text

Developer settings

Open a section to compare the complete declarations.

Supported API settingsShared controls and the settings unique to each model10 shared · 0 model-specific

AOnly Mercury 2.5 0

All declared settings are shared.

BOnly Mercury 2.5 Preview 0

All declared settings are shared.

10 settings supported by both models

Include reasoninginclude_reasoning
Maximum tokensmax_tokens
Reasoningreasoning
Reasoning effortreasoning_effort
Response formatresponse_format
Stop sequencesstop
Structured outputsstructured_outputs
Temperaturetemperature
Tool choicetool_choice
Toolstools

Reasoning settingsEffort levels and reasoning behaviour0 different · 4 shared

A4 declared fieldsB4 declared fields

Setting	AMercury 2.5	BMercury 2.5 Preview
Reasoning required	No	No
Enabled by default	Yes	Yes
Effort levels	highmediumlownone	highmediumlownone
Default effort	medium	medium

Default settingsValues used when a request leaves a setting openDeclarations available below

ANo values declaredBNo values declared

Both models’ declarations are shown above.

Published API declarations. Prices and limits can vary by provider.

Method: tokenizer fingerprinting, v1, 50 strings. This page is static and dated; the interactive bench compares any two of the 353 measured models.