AI model comparison

GPT-6.1 Terra vs GLM 5.3 Flash

Side by side comparison of GPT-6.1 Terra and GLM 5.3 Flash on pricing, benchmark scores, context window, and more.

GPT-6.1 Terra is the mid-tier model in OpenAI's GPT-6.1 series, priced below GPT-6.1 Sol.

Input / 1M: $1
Output / 1M: $5
Context: 1.05M

GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks.

Input / 1M: $0.15
Output / 1M: $0.50
Context: 1.05M

Comparing image generators? Compare image models

At a glance

Quick verdict

How the two models stack up on the things people ask about most.

Lower price

GLM 5.3 Flash

8.2x cheaper for a typical chat

Higher intelligence score

Not available

Not enough benchmark data

Larger context window

GPT-6.1 Terra

1.05M vs 1.05M tokens

Newer release

GPT-6.1 Terra

Released October 26, 2026

Benchmarks

Benchmark scores

Independent scores from Artificial Analysis. Higher is better.

Intelligence index

GPT-6.1 Terra51

GLM 5.3 FlashNot available

Coding index

GPT-6.1 TerraNot available

GLM 5.3 Flash71.5

Agentic index

GPT-6.1 TerraNot available

GLM 5.3 Flash50.9

Pricing

GPT-6.1 Terra vs GLM 5.3 Flash API pricing

Per-token API rates. Cheaper option highlighted.

Metric	GPT-6.1 Terra	GLM 5.3 Flash
Input tokensPer 1M tokens	$1	$0.15
Output tokensPer 1M tokens	$5	$0.50
Cached input (read)Per 1M tokens	$0.05	$0.03
Cache writePer 1M tokens	$1.25	Not available
Long-context pricingPer 1M tokens, for very long prompts	$2 in / $7.50 out above 272K	Same rate at any length
Web searchPer request	$0.01	Not available

What it costs in practice

Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.

Chat message

2K in, 500 out

GPT-6.1 Terra$4.50

GLM 5.3 Flash$0.55

Coding task

30K in, 4K out

GPT-6.1 Terra$50$21.50 cached

GLM 5.3 Flash$6.50$2.90 cached

Long document summary

150K in, 2K out

GPT-6.1 Terra$160$17.50 cached

GLM 5.3 Flash$23.50$5.50 cached

Specs

Context window and capabilities

How much each model can read, how much it can write, and what it accepts as input.

Metric	GPT-6.1 Terra	GLM 5.3 Flash
Context window	1.05M tokens	1.05M tokens
Max output	128K tokens	944K tokens
Input types	File, Image, Text	Image, Text, Video
Output types	Text	Text
Reasoning effort levels	Max, Extra high, High, Medium, Low, None	Max, High, Low
Default reasoning effort	Medium	Max
Release date	October 26, 2026	August 26, 2026

Features

Supported features

API features available for each model.

Metric	GPT-6.1 Terra	GLM 5.3 Flash
Tool calling	Supported	Supported
Structured outputs	Supported	Supported
JSON mode	Supported	Supported
Reasoning	Supported	Supported
Temperature	Not supported	Supported
Stop sequences	Not supported	Supported
Deterministic seed	Supported	Supported
Verbosity control	Supported	Not supported

Our take

GLM 5.3 Flash is 8.2x cheaper for a typical chat. GPT-6.1 Terra has the larger context window (1.05M vs 1.05M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.

FAQ

Frequently asked questions

Is GPT-6.1 Terra or GLM 5.3 Flash cheaper?

GLM 5.3 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). GLM 5.3 Flash costs $0.15 per 1M input tokens and $0.50 per 1M output tokens, while GPT-6.1 Terra costs $1 per 1M input tokens and $5 per 1M output tokens.

Which has a bigger context window, GPT-6.1 Terra or GLM 5.3 Flash?

GPT-6.1 Terra supports up to 1.05M tokens of context, compared with 1.05M for GLM 5.3 Flash.

Can I use GPT-6.1 Terra and GLM 5.3 Flash at the same time?

Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GPT-6.1 Terra and GLM 5.3 Flash answer side by side and keep the better response.

Why choose? Ask both.

Send one prompt to GPT-6.1 Terra and GLM 5.3 Flash at the same time. Compare the answers side by side and keep the best one.

Get started See a preview