DeepSeek V4 Pro (Reasoning)

deepseek/deepseek-v4-pro

DeepSeek V4 Pro (Reasoning)

via OpenRouter

Release Date

Apr 24th, 2026

Context Size

Reasoning

Yes

Benchmark Cost

$7.84

Speed

34.7 tok/s

Subcategories

Bad Writing Habits

Detects common prose quality anti-patterns in AI-generated creative writing, including passive voice, past progressive overuse, weak dialogue tags, filter words, purple prose, cliches, AI-ism words/adverbs/names, and more.

Scenario	#1	#2	#3	#4	#5	Total
Detailed Writing Rules
Fantasy: entering an ancient ruin Creative Writing Hallucination	87	86	85	81	78	83%
Horror: alone in an eerie place at night Creative Writing Hallucination	89	89	88	86	85	87%
Literary fiction: old friends reunite Creative Writing Hallucination	89	88	88	85	84	87%
Mystery: examining a crime scene Creative Writing Hallucination	89	87	86	86	84	86%
Romance: separated couple reunites Creative Writing Hallucination	89	87	86	85	82	86%
Thriller: chase through city streets Creative Writing Hallucination	92	91	90	87	84	89%
Detailed Writing Rules						86.44%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	82	80	75	73	70	76%
Horror: alone in an eerie place at night Creative Writing Hallucination	89	84	81	76	75	81%
Literary fiction: old friends reunite Creative Writing Hallucination	81	77	76	76	76	77%
Mystery: examining a crime scene Creative Writing Hallucination	83	81	81	76	75	79%
Romance: separated couple reunites Creative Writing Hallucination	88	81	78	78	76	80%
Thriller: chase through city streets Creative Writing Hallucination	81	80	79	76	69	77%
genre						78.44%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	80	79	77	72	70	76%
Horror: alone in an eerie place at night Creative Writing Hallucination	84	82	79	79	73	79%
Literary fiction: old friends reunite Creative Writing Hallucination	91	88	86	82	78	85%
Mystery: examining a crime scene Creative Writing Hallucination	88	84	82	82	81	83%
Romance: separated couple reunites Creative Writing Hallucination	89	88	86	82	81	85%
Thriller: chase through city streets Creative Writing Hallucination	90	88	81	80	77	83%
Novelcrafter Default Prompt						81.97%
82.28%

Codex Extraction

Evaluates a model's ability to extract structured codex entries (characters, locations, objects, lore) from prose passages and return them as well-formed XML.

Scenario	#1	#2	#3	#4	#5	Total
Long: The Spire of Echoes (Dense) Tooling Reasoning	98	97	97	96	95	97%
Medium: The Hollow (Inferred) Tooling Reasoning	96	96	96	94	94	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	99	98	98	98	97	98%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	99	99	99	99	95	98%
97.08%

Codex Red Herring (False Positive Detection)

Tests whether models correctly report "no violations" when a codex is fully consistent with the prose passage. Models that hallucinate false violations (false positives) fail. Uses a 2×2 matrix of text length × codex size, with bare and detailed-entry variants.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
basic entries
Long text (~1594 words), big codex (51 entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Long text (~1594 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	100	25	93%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	100	100	25	25	25	25	25	25	55%
Short text (~524 words), small codex (11 entries) Hallucination	100	25	25	25	25	25	25	25	25	25	33%
basic entries											70.00%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	25	93%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	25	25	25	78%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	25	25	85%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	25	25	25	25	25	25	55%
detailed entries											77.50%
73.75%

Codex Violation Detection

Detects factual inconsistencies between a story bible and prose passages. The model must output structured XML identifying each violation with paragraph number and substring.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
matrix
Large codex (40 entries), long passage (1,019 words) Tooling Reasoning	99	97	96	96	96	94	93	88	3	0	76%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	98	98	98	98	97	97	96	95	94	97%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	97	97	97	97	97	97	95	83	96%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	97	97	97	99%
matrix											92.09%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
20 codex entries Tooling Reasoning	100	100	97	97	96	96	94	92	92	85	95%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	95	95	95	0	89%
tiers											95.86%
93.97%

Data extraction

Extract key details from a given block of text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
All valid emails Utility	100	100	100	100	100	100	100	100	100	100	100%
Contextual pronoun Utility	100	100	100	100	100	100	100	100	100	100	100%
Fruits excluding citrus Utility	100	100	100	100	100	100	100	100	100	100	100%
Future event time Reasoning	100	100	100	100	100	100	100	100	100	50	95%
Guess the pet Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Highest-rated movie Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Indirect birth year Reasoning	100	100	100	100	100	100	100	100	100	100	100%
What instrument does Lucy play? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
What's the color of the car? Utility	100	100	100	100	100	100	100	100	100	100	100%
What's the correct time? Reasoning	0	0	0	0	0	0	0	0	0	0	0%
Who's the sister? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Who's the tallest? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
91.25%

Dialogue tags

Various tasks related to dialogue tags in text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
dialogue-200
Write 200 words with 10% dialogue Rule Following Utility	100	100	100	100	100	100	83	50	49	38	82%
Write 200 words with 50% dialogue Rule Following Utility	100	100	100	100	60	50	50	50	43	34	69%
Write 200 words with 90% dialogue Rule Following Utility	100	95	92	83	66	64	56	49	28	18	65%
dialogue-200											71.94%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	92	60	50	21	3	0	0	0	0	0	23%
Write 500 words with 50% dialogue Rule Following Utility	100	91	50	24	0	0	0	0	0	0	27%
Write 500 words with 70% dialogue Rule Following Utility	99	88	36	18	4	1	0	0	0	0	25%
dialogue-500											24.57%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
55.65%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	100	100	0	0	0	40%
Asking for directions (German) Language	100	100	100	100	100	100%
Friend got new kittens (German) Language	100	100	100	100	100	100%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
85.00%

Language Writing

Can the model generate text in different languages?

Scenario	#1	#2	#3	#4	#5	Total
Character dialogue (French) in a story Language	100	100	100	100	100	100%
Character dialogue (German) in a story Language	100	100	100	100	100	100%
Character dialogue (Hindi) in a story Language	100	54	50	50	47	60%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	100	100	100%
92.02%

N-Length Sentences

Write sentences with exactly N words

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Write sentences with 5 words each Utility	100	100	100	100	100	100	100	99	94	88	98%
Write sentences with 10 words each Utility	100	100	100	100	100	100	100	98	91	88	98%
Write sentences with 20 words each Utility	100	100	100	100	93	70	63	0	0	0	63%
86.21%

Novel outline

Handle questions about the outline of a novel in various formats

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
outline-count
Count acts Utility	100	100	100	100	100	100	100	100	100	100	100%
Count chapters Utility	100	100	100	100	100	100	100	100	100	100	100%
Count scenes Utility	100	100	100	100	100	100	100	100	100	100	100%
outline-count											100.00%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	100	100	100	50	50	50	85%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	0	90%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											91.67%
95.83%

Text Replacement

Tests deterministic text transformations: renaming characters/locations, expanding contractions, tense rewriting, POV shifts, gender swaps, combined transformations, and word avoidance. Scored by checking each expected change independently.

Scenario	#1	#2	#3	#4	#5	#6	#7	Total
Generic Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	100	100%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Text Editing	100	100	99	99	99	99	98	99%
Expand all contractions Text Editing	100	100	100	100	100	100	98	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	100	100%
Passive voice → active voice Text Editing Hallucination	97	96	96	96	95	95	95	96%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Text Editing	100	100	100	99	97	90	82	95%
Generic Prompt								98.90%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	100	100%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Text Editing	100	100	100	100	99	99	99	100%
Expand all contractions Text Editing	100	100	100	100	100	100	100	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	100	100%
Passive voice → active voice Text Editing Hallucination	100	100	99	98	98	98	97	98%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Text Editing	100	100	100	100	100	100	100	100%
Specific Prompt								99.80%
99.35%

Tool usage within Novelcrafter

Output messages that are related to tool usage within Novelcrafter

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Create alternate prose sections Tooling	100	100	100	100	100	100	100	100	100	100	100%
100.00%

Voice/dialogue sheets

Extract dialogue from given text as voice sheets.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Multiple speakers Rule Following	100	100	100	100	0	0	0	0	0	0	40%
Simple Rule Following	100	100	0	0	0	0	0	0	0	0	20%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	100	100	100	100%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	100	100	0	90%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
70.00%

Write N of X

Write exactly N words/sentences/paragraphs...

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
paragraphs
1 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
3 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
5 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
paragraphs											100.00%
sentences
1 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
3 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
10 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
50 sentence summary Utility	100	100	100	100	100	100	100	100	98	77	98%
sentences											99.51%
words
10 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
50 word summary Utility	100	100	100	100	100	100	100	100	100	27	93%
100 word summary Utility	100	100	100	100	100	92	92	54	0	0	74%
200 word summary Utility	100	100	100	100	100	100	100	98	92	0	89%
words											91.11%
96.40%