Z.AI GLM 4.5 Air - NC Bench

z-ai/glm-4.5-air

Z.AI GLM 4.5 Air

via OpenRouter

Release Date

Jul 25th, 2025

Context Size

131k

Reasoning

Benchmark Cost

$1.36

Speed

52.3 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	76	70	69	69	68	70%
Horror: alone in an eerie place at night Creative Writing Hallucination	82	79	78	77	77	78%
Literary fiction: old friends reunite Creative Writing Hallucination	89	86	76	76	76	80%
Mystery: examining a crime scene Creative Writing Hallucination	84	83	81	79	77	81%
Romance: separated couple reunites Creative Writing Hallucination	87	82	81	79	79	82%
Thriller: chase through city streets Creative Writing Hallucination	86	85	80	78	75	81%
Detailed Writing Rules						78.73%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	71	70	69	67	66	69%
Horror: alone in an eerie place at night Creative Writing Hallucination	74	68	67	63	62	67%
Literary fiction: old friends reunite Creative Writing Hallucination	81	78	75	74	73	76%
Mystery: examining a crime scene Creative Writing Hallucination	78	78	75	73	67	74%
Romance: separated couple reunites Creative Writing Hallucination	76	75	70	68	67	71%
Thriller: chase through city streets Creative Writing Hallucination	75	73	70	68	66	70%
genre						71.25%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	77	76	68	68	67	71%
Horror: alone in an eerie place at night Creative Writing Hallucination	80	75	71	71	70	73%
Literary fiction: old friends reunite Creative Writing Hallucination	83	81	80	75	69	78%
Mystery: examining a crime scene Creative Writing Hallucination	81	79	74	72	67	74%
Romance: separated couple reunites Creative Writing Hallucination	80	75	73	71	71	74%
Thriller: chase through city streets Creative Writing Hallucination	81	80	75	73	72	76%
Novelcrafter Default Prompt						74.47%
74.82%

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	95	94	92	92	91	93%
Medium: The Hollow (Inferred) Tooling Reasoning	95	93	93	91	88	92%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	94	94	93	88	86	91%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	94	92	91	90	80	89%
91.23%

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	25	25	17	13	4	58%
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	100	100	100	100	30	30	86%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
basic entries											84.18%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	17	17	10	8	3	1	46%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	25	25	85%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	30	3	83%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	25	17	84%
detailed entries											74.50%
79.34%

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	92	89	89	86	86	84	84	74	59	47	79%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	94	93	93	92	87	86	86	79	66	3	78%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	97	93	93	93	93	93	93	93	88	79	92%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	97	97	97	97	97	97	93	88	96%
matrix											86.20%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	93	83	75	95%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	94	86	86	72	94%
20 codex entries Tooling Reasoning	97	92	91	86	86	86	86	82	81	77	86%
40 codex entries Tooling Reasoning	100	100	97	97	93	93	92	92	92	90	95%
tiers											92.46%
89.33%

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	50	50	50	50	50	50	50	50	60%
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	50	50	90%
Indirect birth year Reasoning	100	100	100	100	100	100	100	100	100	50	95%
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	100	100	0	0	0	0	0	0	0	0	20%
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	0	90%
87.92%

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	50	47	30	26	14	0	0	0	0	0	17%
Write 200 words with 50% dialogue Rule Following Utility	82	49	30	14	0	0	0	0	0	0	17%
Write 200 words with 90% dialogue Rule Following Utility	63	52	50	50	50	47	43	40	18	0	41%
dialogue-200											25.17%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
Write 500 words with 50% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
Write 500 words with 70% dialogue Rule Following Utility	47	37	2	1	1	0	0	0	0	0	9%
dialogue-500											2.92%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	61	61	14	83%
23.96%

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	100	100%
Friend got new kittens (German) Language	100	100	100	100	0	80%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
95.00%

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	58	92%
Character dialogue (Hindi) in a story Language	100	100	100	67	52	84%
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%
95.10%

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	96	96	93	93	89	76	76	52	52	37	76%
Write sentences with 10 words each Utility	43	37	37	36	30	26	24	14	11	4	26%
Write sentences with 20 words each Utility	37	32	31	7	7	2	0	0	0	0	12%
37.97%

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	0	0	0	0	0	0	0	30%
outline-count											76.67%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	50	50	50	0	0	0	55%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	0	0	0	70%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	0	0	0	70%
pov-count											65.00%
70.83%

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	99	99	95	95	95	95	95	97%
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	99	99	95	99%
Passive voice → active voice Text Editing Hallucination	97	96	95	93	92	80	77	90%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	82	82	95%
Tense rewriting: past to present Text Editing	100	97	97	97	97	97	93	97%
Generic Prompt								97.46%
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	99	98	98	98	98	97	95	98%
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	99	99	95	94	92	92	96%
Passive voice → active voice Text Editing Hallucination	98	96	96	96	94	93	90	95%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	98	100%
Tense rewriting: past to present Text Editing	100	100	100	100	100	97	97	99%
Specific Prompt								98.54%
98.00%

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	0	0	0	0	0	0	0	0	0	0	0%
Simple Rule Following	0	0	0	0	0	0	0	0	0	0	0%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	0	0	0	70%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	0	0	0	70%
Unattributed dialogue Rule Following	100	100	100	100	0	0	0	0	0	0	40%
36.00%

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	98	98	92	92	77	0	86%
50 sentence summary Utility	100	100	98	27	0	0	0	0	0	0	33%
sentences											83.68%
words
10 word summary Utility	98	98	98	98	98	98	92	92	92	54	92%
20 word summary Utility	100	100	98	77	77	54	27	27	9	9	58%
50 word summary Utility	100	100	100	100	98	77	9	9	2	0	60%
100 word summary Utility	100	98	98	92	54	2	0	0	0	0	44%
200 word summary Utility	0	0	0	0	0	0	0	0	0	0	0%
words											50.81%
74.80%