The Known Good Updated 25 Jul 2026
OpenAI: GPT-5 Nano vs Z.ai: GLM 4.7 ·OpenAI vs Z.ai

OpenAI: GPT-5 Nano vs Z.ai: GLM 4.7 — head-to-head comparison

OpenAI: GPT-5 Nano profile Z.ai: GLM 4.7 profile All comparisons
OpenAI: GPT-5 Nano — OpenAI
Quality
#37 of 61
57based on 3 of 6 evaluations
Known Good Index
Speed
#28 of 316
120.9
Output tokens per second
Price
#56 of 340
$0.14
Blended per 1M tokens
In $0.05 · Out $0.40
Cache hit price
#13 of 206
$0.005
per 1M tokens (−90%)
Context
#105 of 345
400k
tokens (~600 pages)
Z.ai: GLM 4.7 — Z.ai
Quality
#26 of 61
68based on 3 of 6 evaluations
Known Good Index
Speed
#109 of 316
66.2
Output tokens per second
Price
#168 of 340
$0.74
Blended per 1M tokens
In $0.40 · Out $1.75
Cache hit price
#83 of 206
$0.080
per 1M tokens (−80%)
Context
#193 of 345
205k
tokens (~300 pages)
Summary

On the Known Good Index, OpenAI: GPT-5 Nano scores 57 and Z.ai: GLM 4.7 scores 68 — a 11-point lead for Z.ai: GLM 4.7. They share 3 published evaluations, with OpenAI: GPT-5 Nano ahead on 0 and Z.ai: GLM 4.7 ahead on 3.

Blended pricing is $0.14 per 1M tokens for OpenAI: GPT-5 Nano and $0.74 for Z.ai: GLM 4.7 — OpenAI: GPT-5 Nano is about 5.4× cheaper.

Throughput is 121 tokens per second for OpenAI: GPT-5 Nano and 66 for Z.ai: GLM 4.7, with time to first token at 2.9s and 2.1s. OpenAI: GPT-5 Nano accepts 400k tokens of context against 205k.

OpenAI: GPT-5 Nano is proprietary; Z.ai: GLM 4.7 is open weights under Open weights (unrestricted). 11 tracked hosts serve one or both.

Generated from tracked data on 25 Jul 2026 · how these comparisons are computed →

At a glance
MetricOpenAI: GPT-5 NanoZ.ai: GLM 4.7
Known Good Index 57 based on 3 of 6 evaluations 68 based on 3 of 6 evaluations
Blended $/1M $0.14 $0.74
Output tok/s 121 66
Context window 400k 205k
Providers 2 9
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Quality

Known Good Index and the capability indices, side by side

IndicesComponents
Index scores

Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.

MetricOpenAI: GPT-5 NanoZ.ai: GLM 4.7
Known Good Index 57 68
Mathematics Index 89 83
Science Index 69 86
Agentic Index 21 35
Openness Index 5 60
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = OpenAI: GPT-5 Nano · marker = Z.ai: GLM 4.7 · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond69 / 83
MATH / AIME81 / 83
Terminal-Bench22 / 33

Right-hand figures read OpenAI: GPT-5 Nano / Z.ai: GLM 4.7. OpenAI: GPT-5 Nano leads on 0 of 3, Z.ai: GLM 4.7 on 3.

The Known Good

Arena Elo

Human preference rating from blind pairwise votes

Arena ratings

Elo from blind pairwise votes, ingested from Arena. Higher is better.

MetricOpenAI: GPT-5 NanoZ.ai: GLM 4.7
Text Arena — 1,436
Text Arena (style controlled) — 1,442
The Known Good

Price & Cost

Published API pricing by token type

Per token typeCache discount
Published pricing

USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.

MetricOpenAI: GPT-5 NanoZ.ai: GLM 4.7
Input $/1M $0.05 $0.40
Output $/1M $0.40 $1.75
Blended $/1M $0.14 $0.74
Cache read $/1M $0.005 $0.080
The Known Good
We publish blended price rather than cost-per-task. Cost-per-task requires token counts from an evaluation suite we do not run. Blended price is computed from published rates and is fully reproducible — see the pricing methodology.

Context Window

Maximum input accepted and maximum output emitted

Context and output limits

Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.

MetricOpenAI: GPT-5 NanoZ.ai: GLM 4.7
Context window 400k 205k
Max output tokens 128k 131k
The Known Good

Speed & Latency

Median throughput and time to first token across hosting providers

Output speedTime to first token
Throughput and latency

Medians across all tracked providers, derived from OpenRouter endpoint telemetry.

MetricOpenAI: GPT-5 NanoZ.ai: GLM 4.7
Output tokens/s 121 66
Time to first token 2.9s 2.1s
The Known Good

Providers

Which hosts serve each model, and at what price and speed

11 hosts
Full provider benchmarks →
Provider OpenAI: GPT-5 Nano blendedOpenAI: GPT-5 Nano tok/s Z.ai: GLM 4.7 blendedZ.ai: GLM 4.7 tok/s
OpenAI · first party $0.07 225 — —
Azure · first party $0.14 69 — —
Cerebras — — $2.38 401
Google · first party — — $1.00 140
AtlasCloud — — $0.85 54
DeepInfra — — $0.74 49
Venice — — $1.07 46
StreamLake — — $0.80 41
Phala — — $1.46 31
Z.AI · first party — — $1.00 30
Novita — — $0.90 27

Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.

The Known Good
Sources for this page
Pricing & providers — OpenRouter Metadata — models.dev Benchmarks — Epoch AI (CC-BY 4.0)Elo — Arena Full attribution →