DeepSeek V4 Flash 0731 (Reasoning, High)

deepseek/deepseek-v4-flash-0731

DeepSeek V4 Flash 0731 (Reasoning, High)

via OpenRouter

Release Date

Jul 31st, 2026

Context Size

Reasoning

Yes

Benchmark Cost

$1.02

Speed

60.4 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	92	81	79	79	76	81%
Horror: alone in an eerie place at night Creative Writing Hallucination	87	86	85	84	83	85%
Literary fiction: old friends reunite Creative Writing Hallucination	88	87	87	85	80	85%
Mystery: examining a crime scene Creative Writing Hallucination	92	88	87	86	85	88%
Romance: separated couple reunites Creative Writing Hallucination	93	89	88	87	83	88%
Thriller: chase through city streets Creative Writing Hallucination	89	86	85	83	80	85%
Detailed Writing Rules						85.29%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	82	80	77	77	72	78%
Horror: alone in an eerie place at night Creative Writing Hallucination	78	77	75	74	73	75%
Literary fiction: old friends reunite Creative Writing Hallucination	89	81	80	80	79	82%
Mystery: examining a crime scene Creative Writing Hallucination	88	82	80	76	73	80%
Romance: separated couple reunites Creative Writing Hallucination	85	83	81	77	73	80%
Thriller: chase through city streets Creative Writing Hallucination	86	82	81	80	80	82%
genre						79.41%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	84	83	81	79	77	81%
Horror: alone in an eerie place at night Creative Writing Hallucination	87	86	79	73	72	79%
Literary fiction: old friends reunite Creative Writing Hallucination	87	83	81	80	79	82%
Mystery: examining a crime scene Creative Writing Hallucination	91	85	85	82	78	84%
Romance: separated couple reunites Creative Writing Hallucination	88	84	81	81	78	82%
Thriller: chase through city streets Creative Writing Hallucination	91	87	86	84	83	86%
Novelcrafter Default Prompt						82.43%
82.38%

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	99	98	98	97	96	98%
Medium: The Hollow (Inferred) Tooling Reasoning	99	98	98	96	95	98%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	99	98	98	97	97	98%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	100	99	99	99	98	99%
97.91%

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	25	17	17	17	17	17	17	17	34%
Long text (~1594 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	25	25	85%
basic entries											79.79%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	50	25	88%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	50	25	25	25	73%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	25	25	25	25	25	63%
detailed entries											80.63%
80.21%

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	98	98	98	97	96	96	95	94	94	0	87%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	100	100	98	98	98	98	94	94	93	97%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	100	100	95	95	95	95	92	79	95%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	97	97	83	75	95%
matrix											93.61%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	91	99%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	92	92	98%
20 codex entries Tooling Reasoning	100	100	100	100	97	96	96	92	92	92	96%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	97	97	99%
tiers											98.33%
95.97%

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	100	100%
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%
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%
100.00%

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	94	80	7	6	79%
Write 200 words with 50% dialogue Rule Following Utility	100	100	100	50	50	43	19	15	1	0	48%
Write 200 words with 90% dialogue Rule Following Utility	100	100	98	95	90	85	62	60	52	50	79%
dialogue-200											68.51%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	81	47	47	29	5	0	0	0	0	0	21%
Write 500 words with 50% dialogue Rule Following Utility	95	49	23	0	0	0	0	0	0	0	17%
Write 500 words with 70% dialogue Rule Following Utility	31	0	0	0	0	0	0	0	0	0	3%
dialogue-500											13.57%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	61	61	1	82%
46.92%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	100	100	100	100	100	100%
Asking for directions (German) Language	100	100	100	100	0	80%
Friend got new kittens (German) Language	100	100	0	0	0	40%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
80.00%

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	93	99%
Character dialogue (Hindi) in a story Language	100	100	47	0	0	49%
Character dialogue (Italian) in a story Language	100	100	100	100	53	91%
Character dialogue (Spanish) in a story Language	100	100	100	100	38	88%
85.21%

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	98	85	63	53	90%
Write sentences with 10 words each Utility	100	100	100	100	100	100	100	100	96	77	97%
Write sentences with 20 words each Utility	100	100	100	100	100	100	100	100	100	100	100%
95.70%

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	0	0	80%
Count scenes Utility	100	100	100	100	100	100	100	100	100	100	100%
outline-count											93.33%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	0	90%
pov-count											96.67%
95.00%

Relationship tree

Extracts a deterministic XML family and relationship tree from cumulative literary prose.

Scenario	#1	#2	#3	#4	#5	Total
Core relationship tree Tooling Reasoning Hallucination	100	98	96	96	96	97%
Family relationship tree Tooling Reasoning Hallucination	94	94	87	86	82	89%
93.04%

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	97	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	97	50	37	36	74%
Expand all contractions Text Editing	100	100	100	100	100	100	11	87%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	92	99%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	98	100%
Passive voice → active voice Text Editing Hallucination	98	96	95	94	91	90	80	92%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	99	98	70	95%
Tense rewriting: past to present Text Editing	100	96	93	89	77	74	22	79%
Generic Prompt								91.73%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	83	98%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	79	97%
Combined: 3rd person past → 1st person present Text Editing	100	100	100	100	99	99	93	99%
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	91	99%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	86	98%
Passive voice → active voice Text Editing Hallucination	98	98	98	97	97	96	82	95%
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	90	99%
Specific Prompt								98.21%
94.97%

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	0	0	0	0	0	0	0	0	20%
Simple Rule Following	100	100	100	100	100	100	100	0	0	0	70%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	0	0	0	0	60%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	100	0	0	80%
Unattributed dialogue Rule Following	100	100	100	100	100	100	0	0	0	0	60%
58.00%

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	100	100	100%
sentences											100.00%
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	77	98%
50 word summary Utility	100	100	100	100	100	100	100	92	77	77	95%
100 word summary Utility	100	100	100	100	100	100	100	27	9	0	74%
200 word summary Utility	100	100	100	100	100	100	0	0	0	0	60%
words											85.20%
94.31%